Ex_4.12_recursive_itoa.c

/* recursive version of itoa; that converts an integer string by calling a recursive routine */

#include<stdio.h>
#include<math.h>

#define MAXLEN 100

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


int main(void)
{
	int n;
	char s[MAXLEN];

	n = 1723;

	itoa(n,s);

	printf("%s",s);

	return 0;
}

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

	if(n/10)
		itoa(n/10,s);
	else
	{
		i = 0;
		if( n < 0)
			s[i++]='-';
	}

	s[i++] = abs(n) % 10 + '0';

	s[i] = '\0';

}