Quick print decimal in binary using C

decimal2binary.c

#include <stdio.h>
#include <stdlib.h>

int main(int argc,char* argv[] )
{
    int n = atoi(argv[1]);
    int i=0;
    
    for(; i < sizeof( int ) * 8 ; i++,  n <<= 1 )
    {
        printf("%d", n<0 ? 1 : 0 );
    }
    printf("\n");
    
    return 0;
}