Reverse of a Number using do-while loop in C

Program code to find Reverse of a Number in C:

#include<stdio.h>
#include<conio.h>
void main()
{
    int n,a,r,s=0;
    clrscr();
    
    printf("\n  Enter The Number:");
    scanf("%d",&n);
    a=n;
    
    //LOOP FOR FINDING THE REVERSE OF A NUMBER
    do
    {
        r=n%10;
        s=s*10+r;
        n=n/10;
    }while(n>0);
    
    printf("\n  The Reverse Number of %d is %d",a,s);
    getch();
}

Related: Reverse of a Number using do-while loop in C++

Working:

  • First the computer reads a number from the user.
  • Then using do-while loop the reverse number is calculated and stored in the variable ‘s’.
  • Finally the reverse of a given number is printed.

Step by step working of the above C program:

Let us assume a number entered is 1234.

So n=1234 , s=0

  1. r=n%10       (r=1234%10)      So  r=4

   s=s*10+r     (s=0*10+4)         So  s=4

   n=n/10        (n=1234/10)       So  n=123

  1. n>0  (123>0)  do-while loop condition is true

r=n%10       (r=123%10)      So  r=3

s=s*10+r    (s=4*10+3)        So  s=43

n=n/10       (n=123/10)       So  n=12

  1. n>0  (12>0)  do-while loop condition is true

r=n%10       (r=12%10)         So  r=2

s=s*10+r    (s=43*10+2)      So  s=432

n=n/10       (n=12/10)          So  n=1

  1. n>0  (1>0)  do-while loop condition is true

r=n%10       (r=1%10)             So  r=1

s=s*10+r    (s=432*10+1)      So  s=4321

n=n/10       (n=1/10)              So  n=0

  1.  n>0  (0>0)  do-while loop condition is false

It comes out of the do-while loop and prints the reverse number which is stored in variable “s”.

  1. Thus the program execution is completed.

Output:

reverse of a number

reverse of a number

TO DOWNLOAD THE PROGRAM CODE :CLICK HERE

 

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