Exercise 4.12. Adapt the ideas of printd to write a recursive version of itoa

Exercise 4.12. Adapt the ideas of printd to write a recursive version of itoa; that is, convert
an integer into a string by calling a recursive routine.

#include <stdio.h>

#define LEN 100

void itoa(int n, char s[]);

int abs(int x);

int main()

{

    int n;

    char s[LEN];

    

    printf("Enter the number: ");

    scanf("%d", &n);

    itoa(n, s);

    printf("%s\n", s);

    return 0;

}

/*itoa*/

void itoa(int n, char s[])

{

    static int i; 

    int sign;

    

    i = 0;

    sign = n;

    if(n/10)

        itoa(n/10, s);

    else

    {

        if(sign < 0)

            s[i++] = '-';

    }

    s[i++] = abs(n % 10) + '0';

    s[i] = '\0';

}