C++ Reverse Number Conversion Program Logic
Reverse Number Program in C Plus Plus using While Loop |
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();
}
Reverse Number Program in C
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