Decimal to Binary

#include <stdio.h>#include <stdlib.h>void printBinary(int);int main(){    decimal2Binary(15);    printf("\n");    printBinary(15);    return 0;}void printBinary(int a){    int i;    for(i = sizeof(a)*8 - 1; i >= 0; --i){        if((a >> i) & 1)            putchar('1');        else            putchar('0');    }}