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The following C program using recursion reverses the digits of the number and displays it on the output of the terminal. For example, 12345 becomes 54321.
C program to reverse a number using Recursion - Source code
/*
* C program to find the reverse of a number using recursion
*/
#include <stdio.h>
#include <math.h>
int reverse(int, int);
int main()
{
int n, result;
int len = 0, temp;
printf("Enter an integer number to reverse: ");
scanf("%d", &n);
temp = n;
while (temp != 0)
{
len++;
temp = temp / 10;
}
result = reverse(n, len);
printf("The reverse of %d is %d.\n", n, result);
return 0;
}
int reverse(int n, int len)
{
if (len == 1)
{
return n;
}
else
{
return (((n % 10) * pow(10, len - 1)) + reverse(n / 10, --len));
}
}
Program Output
Enter an integer number to reverse: 123547
The reverse of 123547 is 745321.