C/Visual C - Como cambiar la coma a tabulador

#include "stdlib.h"

#include "stdio.h"

#define MAX 30

int main(){

	char re[MAX];

	int i;

	printf("Escribe cadena\n");

	for(i=0; i!=EOF;i++)

	scanf("%c", &re[i]);

	for(i=0; i!=EOF; i++){

		if(re[i]==',')

		re[i]=9;

	}

	for(i=0; i!=EOF;i++)

	printf("%c",re[i]);

	printf("aqui esta bien");

	system ("pause");

	return 0;

}

#include <stdlib.h>

#include <stdio.h>

#define MAX 31

int main() {

    const char NEW_LINE = '\n';

    const char TAB = '\t';

    const char NULL_TERMINATOR = '\0';

    const char COMMA = ',';

    char re[MAX];

    unsigned char i = 0;

    char c;

    printf("Escribe cadena:\n");

	while (NEW_LINE != (c=getchar())) {

	     if(i < MAX-1) {

		     re[i++] = (COMMA == c) ? TAB : c;

	     }

	}

	re[MAX] = NULL_TERMINATOR;

	printf("%s\n", re);

	return EXIT_SUCCESS;

}