This C Program uses recursive function & reverses the string entered by user in the same memory location. Eg: “program” will be reversed to “margorp”

Here is the source code of the C program to reverse a string. The C Program is successfully compiled and run on a Linux system. The program output is also shown below.

/*
* C Program to Reverse the String using Recursion
*/
#include <stdio.h>
#include <string.h>

void reverse(char [], int, int);
int main()
{
char str1[20];
int size;

printf("Enter a string to reverse: ");
scanf("%s", str1);
size = strlen(str1);
reverse(str1, 0, size - 1);
printf("The string after reversing is: %s\n", str1);
return 0;
}

void reverse(char str1[], int index, int size)
{
char temp;
temp = str1[index];
str1[index] = str1[size - index];
str1[size - index] = temp;
if (index == size / 2)
{
return;
}
reverse(str1, index + 1, size);
}

$ cc pgm12.c
$ a.out
Enter a string to reverse: malayalam
The string after reversing is: malayalam

$ a.out
Enter a string to reverse: cprogramming
The string after reversing is: gnimmargorpc