Convert a Number into Reverse Number Program in C Plus Plus - Download Turbo C Language and C++ IDE and Programs Free

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## C++ Reverse Number Conversion Program Logic

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.

• 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.

### 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();

}