C++ Program To Calculate Area and Circumference of Circle in C Plus Plus Program

Easyway How To Write a Program in C++ for Calculating Area and Circumference of Circle

Program Statement: Write a C++ program to input radius of a circle and calculates and prints the area and circumference of the given circle.

Calculate area and circumference of circle in C++ Program Easyway

What are the Formulas Used in C++ Program for Area and Circumference of Circle?

To write this program, first of all we have to find the accurate formulas for area and circumference of circle.
These are as follows:

1. area of circle = Π R ²
2. circumference of circle =  2 Π R

How Formulas of Circle are Transformed into C++ Arithmetic Expressions

In C++ programming, we write the above formulas as follows

1. area = 3.14 * radius * radius
2. circum = 2 * 3.14 * radius

Note: 3.14 is the vale of constant PI  shown with symbol Π

A Better Programming Approach is to Use Symbolic Constants instead of hard coding numbers directly in C++ programs.

How To Define a Constant PI in C++ (C++ Program 

for Calculating Area and Circumference of  Circle

There are two ways:

1. Using #define Pre processor Directive:     #define PI  3.14
2. Using const Qualifier :                             const float PI = 3.14;

C++ Source Code for Calculating Area and Circumference of  Circle

#include<iostream.h>

#include<conio.h>

#include<iomanip.h>

#define PI 3.14

void main()

{

   float radius, area, circum;

   clrscr();

    cout<<"Enter radius of circle = ";

    cin>>radius;

    area = PI * radius * radius;

    circum = 2 * PI * radius;

   

    cout<<"Area of  circle = "<<setprecision(2)<<area<<endl;

    cout<<"Circumference of circle = "<<setprecision(2)<<circum;

    getch();

}

How This Program Works for Calculating Area and Circumference of  Circle

#include<iostream.h>  // include header file for cin, cout

#include<conio.h>     // include header file for  clrscr() 

#include<iomanip.h>  // include header file for setprecision()

#define PI 3.14   // define constant PI

void main()

{

   float radius, area, circum;   declare variables

   clrscr();

    cout<<"Enter radius of circle = ";

    cin>>radius;           //input radius

    area = PI * radius * radius;   // calculate area

    circum = 2 * PI * radius;   // calculate circumference

   

   // used setprecision(2) to show value of area upto two decimal places

   cout<<"Area of  circle = "<<setprecision(2)<<area<<endl;

   // used setprecision(2) to show value of circumference upto two decimal places

    cout<<"Circumference of circle = "<<setprecision(2)<<circum;

    getch();

}

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C++ Program to Calculate Bonus on Salary Grade Wise

Q: Write a C++ Program To Calculate Bonus on Salary Grade Wise

Program Statement: Write a C++ Program to input salary and grade. it applies a 60% bonus to employees of grade 17 or above. It adds a 30% bonus for all employees of grade less than 17.

Salary Bonus C|++ Program

Source code of Salary Program for Dev C++ and Modern C++ Compilers / IDEs

#include<iostream>

using namespace std;

int main()
{
 float salary,bonus;
 int grade;
 
 cout<<"Enter salary of Employee=";
 cin>>salary;
 cout<<"Enter grade=";
 cin>>grade;

 if(grade>=17)
   bonus = salary * 60.0/100.0;
   else
   bonus = salary * 30.0/100.0;
 salary = salary + bonus;
 cout<<"The Total salary of Employee = "<<salary;

 return 0; 
 }

Sample output of Salary Grade Bonus Program

Enter salary of Employee=10000

Enter grade=17

The Total salary of Employee = 16000

--------------------------------

Process exited after 26.75 seconds with return value 0

Press any key to continue . . .

C++ Source Code of  Program To Calculate Bonus on Salary for Turbo C++ 3.0 IDE / Compiler

#include<iostream.h>
#include<conio.h>

void main()
{
 float salary,bonus;
 int grade;
 clrscr();
 cout<<"Enter salary of Employee=";
 cin>>salary;
 cout<<"Enter grade=";
 cin>>grade;

 if(grade>=17)
   bonus = salary * 60.0/100.0;
   else
   bonus = salary * 30.0/100.0;
 salary = salary + bonus;
 cout<<"The Total salary of Employee = "<<salary;

  getch();
 }

Output of Sample Run: Salary Bonus C ++ Program

Calculate Salary with Bonus according to Grade C++ Program

How Salary Bonus C++ Program Works: Logic

#include<iostream.h>      //include header files
#include<conio.h>

void main()       
{
 float salary,bonus;       
 int grade;
 clrscr();
 cout<<"Enter salary of Employee=";      
 cin>>salary;                   // Enter salary
 cout<<"Enter grade=";          
 cin>>grade;                   // input grade

   // check if grade greater than or equal to 17

 if(grade>=17)            
   bonus = salary * 60.0/100.0;    //  calculate 60% bonus
   else
   bonus = salary * 30.0/100.0; // calculate 30% bonus
 salary = salary + bonus;     // add bonus to salary

// print salary
 cout<<"The Total salary of Employee = "<<salary;

//for staying output window until the user presses a key  getch();   
 }

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Program Area of Triangle Algorithm Flowchart

Q: Write a C++ Program to input three sides of a triangle. The program then calculates the Area of triangle by the formula 

Formula of area of triangle when 3 sides given

Where s = ( a+b+c ) / 2

Write Down Algorithm of C++ Program Area of Triangle

1. Start

2. Input a,b,c

3. Calculate s = (a + b + c ) / 2

4. Calculate area = sqrt( s*(s-a)*(s-b)*(s-c))

5. print "Area of Triangle=", area

6. End

Develop Flowchart of C++ Program Area of Triangle

develop flowchart c plus plus program area of triangle

Generally we prepare a flowchart and algorithm which is independent of  any programming language so here is a better flowchart version for C++ Program Area of Triangle with mathematical formula instead of C++ arithmetic expressions.

Flowchart for C++ Program How To Calculate Area of triangle when 3 side are input

develop flowchart c plus plus program area of triangle programming language independent

Source code for modern C++ IDEs /Compilers ( Used Dev C++ )

#include<iostream>
#include<math.h>

using namespace std;
int main( )
{
float a,b,c,s,area;

cout<<"Enter side A of triangle = ";
cin>>a;
cout<<"Enter side B of triangle = ";
cin>>b;
cout<<"Enter side C of triangle = ";
cin>>c;

s = (a + b + c ) / 2;

area = sqrt ( s * (s - a ) * (s - b ) * (s - c ) ) ;

cout<< "Area of Triangle = "<<area;
return 0;

}

Output of the sample run:

Enter side A of triangle = 5

Enter side B of triangle = 5

Enter side C of triangle = 5

Area of Triangle = 10.8253

--------------------------------

Process exited after 4.697 seconds with return value 0

Press any key to continue . . .

Write Down Source Code of C++ Program Area of Triangle for Turbo C++ 3.0 Compiler / IDE

#include<iostream.h>

#include<conio.h>
#include<math.h>

void main( )

{

float a,b,c,s,area;

clrscr();

cout<<"Enter side A of triangle = ";

cin>>a;

cout<<"Enter side B of triangle = ";

cin>>b;

cout<<"Enter side C of triangle = ";

cin>>c;

s = (a + b + c ) / 2;

area = sqrt ( s * (s - a ) * (s - b ) * (s - c ) ) ;

cout<< "Area of Triangle = "<<area;

getch();

}

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C++ Program Temperature Conversion Celsius To Fahrenheit Formula

The formula for converting temperature in Celsius to Fahrenheit is:
f=9.0/5.0 * c + 32;

It means that User input = temperature in Celsius

and output is temperature in Fahrenheit.

Easyway Temperature Conversion C++ Program Celsius Into Fahrenheit Scale Formula - C++ Source Code

Easyway Temperature Conversion C++ Program Celsius Into Fahrenheit Scale Formula - C++ Source Code

//Turbo C++ 3.0 IDE Easyway C++ Programs
#include<iostream.h> 
#include<conio.h>
void main()
{ 

float c,f;

cout<< "Enter Temperature in Celsius= ";

cin>>c;

f=9.0/5.0 * c + 32;

cout<<"Temperature in Fahrenheit="<<f;

getche();
} 

Output Result of  Temperature Conversion C++ Program Celsius Into Fahrenheit Scale Formula - C++ Source Code

Output Result of  Temperature Conversion C++ Program Celsius Into Fahrenheit Scale Formula - C++ Source Code

You would also like to view:

Write A C++ Program To Convert Fahrenheit Temperature Into Centigrade with formula c= 5.0 / 9.0 x (f - 32)

Program Temperature Conversion Algorithm Flowchart

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Write a C++ Program To Check a Number For Even Odd Using Conditional Operator Ternary Operator

Here is the C++ source code  for the program that will input an integer number and will
check this number whether it is even or odd. But this program will not use if else statement for checking this number for even / odd. Rather it will use C++ Conditional operator / Ternary operator for this purpose as shown in the following figure of the even odd program using ternary operator:

Easyway C++ Program to check a number for even odd using conditional operator or ternary operator

Here is the C++ program:

#include<iostream.h>
#include<conio.h>
void main()
{
    int n;
   clrscr();
    cout<<"Enter a number to check for Even / Odd = ";
    cin>>n;
    (n%2==0) ? cout<<"Number is Even" : cout<<"Number is odd";
    getch();
}

A sample execution of the program even odd with conditional operator is as follows:

when user enters 10 the output will be Number is Even
and when user enters 111 then output message shown will be Number is Odd.

Program C++ To Check number even or odd with ternary operator / conditional operator output

Explanation of Logic behind : Even / Odd Program i C++ with Ternary Operator or Conditional Operator

The main statement of this program is using Conditional operator. 

The conditional operator has the syntax:

(condition)? case_if_true : case_if_false ;

Working of Conditional Operator

The condition will be checked first of all, if condition is true then first statement is executed otherwise second statement is executed, as shown in the following line of code.
{ 
Note: here in true_case and false_case we can use only:
 arithematic expression, constant value, input / output statement;
}

(n%2==0) ? cout<<"Number is Even" : cout<<"Number is odd";

so if we enter 10

condition becomes 10%2==0  

We know that % gives remainder so 10%2 will give zero

so condition becomes 0 == 0 which is true 

so first statement is executed and output message is displayed: Number is Even.

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C Plus Plus Program to Calculate Factorial of Number Using Do While Loop

Program To Calculate Factorial of a Number Using do ... while Loop

 What is Factorial?

factorial of a number is calculated by multiplying all the integer numbers from given number n to 1.
For example, factorial of  3 = 3 x 2 x 1.

What is do while Loop in C++ ?

do while loop is the third loop provided by C++. First two are for loop and while loop. The do while loop is used to execute a set of one or more statements repeatedly as long as the given condition remains true.

The main difference between while loop and do while loop is that

 the syntax of do while loop places the condition after the body of loop. The effect of this is that the loop body of do while loop is executed at least once irrespective of the given condition for loop is true or false for first time.

The syntax of do while loop is:

   do

   statement;

  while  ( condition );

   or for a set two or of statements the syntax of do while loop will be as follows:

   do
  {
     statement 1;
     statement 2;
     .
     .
     .
    statement n;
  }
   while ( condition );

Simple example of do while loop to display first 5 numbers 1 to 5

  int i=1;
  do
   {
      cout<<i<<endl;
      i++;
    }
     while ( i<=5 );

  output:
    1
    2
    3
    4
    5

Now we start writing the the program to calculate factorial of a number provided by the user at runtime using do ... while loop

// This program will calculate factorial of a given number provided //by user at run time using do while loop
#include<iostream.h>
#include<conio.h>

void main( )

  {
         int num,  i, fact;
         clrscr( );
         cout<<"Enter a number to calculate Factorial=";
         cin>>num;
         fact= 1;
         i = 1;
         do
             {
                 fact = fact * i;
                 i++;
             } 
              while ( i <= num );
          
           cout<<"Factorial of = "<<num<< " = "<<fact;
           getche();
      }

      

Sample Output of  Program To Calculate Factorial of a Number Using do ... while Loop

Enter a Number to Calculate Factorial: 4
Factorial of 4 = 24

More Programs of Factorial are as follows:

Factorial By For Loop Statement

 Program Factorial by While Loop Logic



     

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Download and Install Turbo C++ Full Screen IDE for Windows 7 Vista

Today we will discuss How to Download and Install Turbo C++ With Full Screen IDE for Windows 7 and Vista.

What is Turbo C++?

Turbo C++ 3.0 is the most popular OLD is GOLD Compiler for C language and C++ Language. in many countries students, normally, use Turbo C++ 3.0 for learning C / C++ programming.
They write their first C Language Program or C++ Program in Turbo C IDE. You can download and install Turbo C++ 3.0 in easy steps as follows:

Link for Download and Install Turbo C++ With Full Screen IDE for Windows 7 and Vista

Download and Install Turbo C++ With Full Screen IDE for Windows 7 and Vista

Download and Install Turbo C++ With Full Screen IDE for Windows 7 and Vista

How To Install Turbo C++ With Full Screen IDE for Windows 7 and Vista.

 
 After you have downloaded the Turbo C++ installation zip file from mediafire website , extract this file.

Double click on the Turbo C++ installation file to start setup. Click on Next button.
Images are given below to guide you the Installation Process of Turbo C++ IDE.
 

Accept the terms and click on install button.


Click on Finish button to end the setup. Congratulations! Now you can learn C++ computer programming in Turbo C++ IDE. You can write and run your first C++ Program in Turbo C IDE.



Click on start button and click on Turbo C++ icon.

Click on File menu and select New.



Type the first program as shown in the above picture. Click on RUN menu and select Run command. The output of the program will be shown as the following picture:

End of the C++ Tutorial How To Download, Install Turbo C++ With Full Screen IDE for Windows 7 and Vista and Write and Run First Program

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C Plus Plus Program Conversion of Hours into Weeks Days Hours

Today, we are going to discuss a simple program logic that uses only input, output and assignment statements along with variable declarations.

Points of Discussion are:

Easyway How to write c++ program convert hours into weeks days hours

• C++ Program: Input Hours Convert into Weeks, Days and Hours.
• Algorithm of the Hours Conversion Program
• C++ Code of the Hours Conversion Program.
• Understanding Logic of The Hours into Week, Day and Hours Program

C Plus Plus to convert hours into weeks days and hours

ALGORITHM : Hours Conversion

This algorithm is used to input hours and convert into weeks, days and hours.

1. Start
2. Input Hours
3. Calculate Weeks = Hours / 168
4. Calculate Hours = Hours Mod 168
5. Calculate Days = Hours / 24
6. Calculate Hours = Hours Mod 24
7. Display "Weeks=", Weeks
8. Display "Days=", Days
9. Display "Hours =", Hours
10. End

C++ Code: Program Hours Conversion into Weeks, Days and Hours.

/* This program is used to input hours from the user. Then this algorithm "Hours Conversion" will convert hours into weeks, days and hours.*/
#include<iostream.h>
#include<conio.h>

void main()
{
      clrscr();
      int h, w, d, hrs;
      cout<<"Enter Hours=";
      cin>>hrs;
      h = hrs;
      w = hrs / 168;
      hrs = hrs % 168;
      d = hrs / 24;
      hrs = hrs % 24;
      cout<<"Total Hours input = "<<h<<endl;
      cout<<"Weeks ="<<w<<endl;
      cout<<"Days ="<<d<<endl;
      cout<<"Hours ="<<hrs;
      getch();
}

OUTPUT of Sample Run of The Program Hours Conversion

Enter Hours= 200
Total Hours input =200
Weeks = 1
Days =1
Hours =8

Logic of The Program Hours Conversion

We know that:
1 day = 24 hours
so 1 week = 24 x 7 = 168 hours

Therefore we will divide total hours by 168 to get weeks.
weeks = 200 / 168 will give 1 week.
Now to calculate remaining hours we will get remainder of the division 200 % 168
This will give remaining hours = 32

To get days, we will divide remaining hours by 24
so 32 / 24 will give 1 day.

Now we will calculate remaining hours by remainder 32 % 24 that will give the result 8 hours.

So the output 1 week, 1 day and 8 hours.

If you enjoyed the C++ Learning Through Example program Logic Understanding, Please share this blog on Social media. Thanks!

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Convert a Number into Reverse Number Program in C Plus Plus

C++ Reverse Number Conversion Program Logic

Reverse Number Program in C Plus Plus using While Loop

Q: Write a C++ Program to input an integer number and display its Reverse Number. For example if the input is the number 123, the Reverse Number will be 321.

Reverse Number Logic in common programming is very important. Although, it is difficult for beginner programmers, you must learn and understand REVERSE NUMBER Program in C++ or JAVA. This will be helpful for further improvements in your programming logic.

Reverse the input number program in C++

• First of all we suppose that the number entered is 123.
•  Let the given number num = 123

• Copy the number in temporary variable temp so that temp = 123

First Iteration of While Loop

• We start a while loop with condition temp>0. Since temp=123 so loop will start for first time.
• Now we will divide number 123 by 10 so that the remainder R = 3 and Quotient Q = 12
• Put the values in statement rev = rev * 10 + R
• rev = 0 * 10 + 3
• rev = 3
• Assign the value of Quotient Q to temp so that temp = 12 now.
• Since temp 12 is >0, so the while loop will execute again.
•  

Second Iteration of While Loop

• Now we will divide number temp 12 by 10 so that the remainder R = 2 and Quotient Q = 1
• Put the values in statement rev = rev * 10 + R
• rev = 3 * 10 + 2
• rev = 30+2
• rev = 32
• Assign the value of Quotient Q to temp so that temp = 1 now.
• Since temp 1 is >0, so the while loop will execute again.

 Third Iteration of While Loop

•  Now we will divide number temp 1 by 10 so that the remainder R = 1 and Quotient Q = 0
• Put the values in statement rev = rev * 10 + R
• rev = 32 * 10 + 1
• rev = 320+1
• rev = 321
• Assign the value of Quotient Q to temp so that temp = 0 now.
• Since temp 0 is not >0, so the condition temp>0 will evaluate to false so that the while loop will terminate.

While loop reverse a number program

Conclusion

       So the Required Reverse Number is 321.

The Actual C++ Code of Reverse Number Program

/*
Program to input a number, then display its Reverse number.
(c) Www.EasyCppProgramming.Blogspot.Com
*/


#include<iostream.h>
#include<conio.h>
#include<math.h>
void main()
{
     int num, temp, rev=0, R, Q;

     clrscr();

     cout<<"Enter a number to reverse=";

     cin>>num;

     temp = num;

     while ( temp>0 )

     {

       Q = temp/10;
       R = temp % 10;
       rev = rev*10 + R;

       temp = Q;

     }

     cout<<"\n The Reverse Number = "<<rev;
     getch();

     }

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Insertion Sort Algorithm Trace Steps and C++ Program

Today, we will discuss Insertion Sort Algorithm Trace Steps on Sample Data and C++ Program implementation of Insertion Sort. First of all, we will:

1. Define Insertion Sort
2. Explain the working of Insertion Sort 
3. Design an algorithm of Insertion Sort
4. Show trace steps of Insertion sort algorithm for sample data on paper.
5. Finally, write down the actual code of Insertion sort program in C++.

  What is Insertion Sort?

In Insertion sort, we have to insert elements in to correct position. First of all we find the correct position to insert for the key value under consideration. Secondly we will move other elements to make space for this new element (key value). Now we insert the new element at this space. Suppose there are the following elements in an array A to sort by insertion sort:

Working of Insertion Sort

1. Let first item be trivially sorted.
2. Now we consider first two items of list. Place second item on its correct location.
3. In Third pass we will consider first three items from list. Insert the 3rd item at its correct location among location1, location2 and location3.
4. In 4th pass, insert the 4th item at its correct location among location1, location2, location3 and location4.
5. And so on.

Algorithm of Insertion Sort

 Algorithm: INSERTION-SORT(array)
 This algorithm takes Array 'array' of size n numbers (array has index from 0 to n-1)as input. It sorts the given array in ascending order by INSERTION SORT method. i and j are integer variables used as index of array. temp is a temporary integer variable.
 1.   Repeat through step 6 for i ← 1 to n-1
 2.     temp  ← array[i]
 3.    Repeat through  step 5 while ( j > 0 && array[j-1] > temp)
 4.    array[j] ← array[j -1]
 5.    j ←   j - 1
 6.    array[j]← temp
 7.    End  

Insertion Algorithm Paper Tracing with data:a[0] ,a[1], a[2], a[3], a[4], a[5]
 5,       2,     4,      6,     1,     3
1. First of all we suppose that the first element 5 is its correct place or trivially sorted.

2. Now we consider second element 2. We have to insert 2 at its correct location from first two locations [0] and [1]. We will find its correct position from first two items 5 and 2.
3. Since 2 is less than 5, so the correct location of 2 is at array index[0].
4. We will move 5 from position [0] to [1].
5. Now we will place 2 at [0], so we have sorted first two items.

6. Now array = 2,5,4,6,1,3 Consider 3rd item which is 4. Now we find its correct location from first three locations. So 4 will be inserted at location [1] between 2 and 5.
7. We move 5 to position [2] and place 4 on position [1]
8. So first three items are sorted with array = 2,4,5,6,1,3

9. Now array = 2,4,5,6,1,3   consider 4th item 6 and place on its correct location among first four locations.
    We know that 6 is at its correct location which is 4th location and by index it is [3].

10. Now array is 2,4,5,6,1,3  consider 5th item which is 1. We know that its correct location between first
      five items is number one that is position [0] by index.
11. So we move 6 on [4]
           we move 5 on [3]
           we move 4 on [2]
           we move 2 on [1]
12. Now place 1 on position [0], so the array items a[0] to a[4] are sorted

13. Now array is 1,2,4,5,6,3   consider 6th item which is 3.
14. We know that 3 will be inserted at location [2] between item 2 and item 4.
15. We move 6 to location [5]
            move 5 to [4]
            move 4 to [3]
16. Now place 3 at location [2]
17. Hence the whole array has been sorted now     1,2,3,4,5,6
       
 You can check this all process in the following picture of insertion sort paper tracing.
   

Insertion Sort Algorithm Trace Steps and Program

Image: Trace steps : Insertion Sort Algorithm Trace Steps and Program

Easyway C++ : Insertion sort Algorithm trace steps and C++ Program

Program Insertion Sort in C++

/*
(c)EasyCppProgramming.Blogspot.Com
C++ is Simplified Here!
Target 1001 C++ Example Programs!
EasyCppProgramming.Blogspot.Com
*/

// Program To Input an array and sort
// the array by Insertion Sort Algorithm

#include<iostream>
#include<conio.h>

int main()
 {

   int n, array[100], i, j, t;

cout<<"\n/* Insertion sort Ascending order */\n";

  cout<<"Enter number of elements\n";
  cin>>n;

  cout<<"Enter "<<n<<" numbers\n";

  for (i = 0; i < n; i++)
    cin>>array[i];


for( i = 1;i < n; i++)
     {
     temp = array[i];
     for ( j = i; j > 0 && array[j-1] > temp; j--)
     array[j] = array[j-1];
     array[j] = temp;
     }

  cout<<"Sorted list in ascending order:\n";

  for (i = 0; i <= n - 1; i++)
    cout<<array[i]<<endl;

  getch();
  return 0;
}

Image: Sample Run of Program in Turbo C++ 3.0 - Insertion Sort Algorithm Trace Steps and Program

Easyway C++ : Insertion sort algorithm C++ Program Output Trace output

 Another Insertion Sorting Example for sorting data: 5,2,3,8,1

Figure: ample data trace steps: Insertion Sort Algorithm Trace Steps and Program

Insertion Sort Algorithm Trace Steps and Program - easyway C++ Program

So, we have completely discussed Insertion Sort Algorithm Trace Steps and Program, if you have any question please do not hesitate to ask question in comments section, thanks.

Further suggested Reading: Sorting Algorithms and Programs in C / C++

1.  Bubble Sort Algorithm and Program Logic in C Plus Plus

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