Exercise 4.13. Write a recursive version of the function reverse(s).

Exercise 4.13. Write a recursive version of the function reverse(s), which reverses the
string s in place.

#include <stdio.h>

#include <string.h>

void reverse(char s[]);

int main()

{

    char s[] = "Hello world";

    

    reverse(s);

    printf("%s\n", s);

    return 0;

}

/* reverce: reverses the string in place */

void reverse(char s[])

{

    char tmp;

    static int i = 0;

    int j = strlen(s) - (i+1);

    if(i < j)

    {

        tmp = s[i];

        s[i++] = s[j];

        s[j] = tmp;

        reverse(s);

    }

}

Result: