Question

1. Write a program in C to reverse a string using recursion. For example:

        reverse("abcde", ...)  -> "edcba"
   

   void reverse(char* str, int i, int s) {

   }

2. provide output and main please

Answer 1

#include <stdio.h>

void reverse(char* str, int i, int s) {
    if (i < s) {
        char temp = str[i];
        str[i] = str[s];
        str[s] = temp;
        reverse(str, i+1, s-1);
    }
}

int main() {
    char s[100] = "abcde";
    printf("Original string: %s\n", s);
    reverse(s, 0, 4);   // starting index is 0 and final index in string is 4
    printf("Reversed string: %s\n", s);
    return 0;
}

Original string: abcde Reversed string: edcba