[C语言] sizeof 咋用？

Question

#include <stdio.h>

int transformToBin(int,int[]);

int main ()
{

  int b[100];
  transformToBin(10,b);


   return 0;
}


int transformToBin(int dnum,int bin[]){
	int i,j=0;

	while(dnum!=0){
		i=dnum%2;
		bin[j]=i;
		dnum=dnum/2;
		j++;
	}


//	c=sizeof(bin)/sizeof(int);
printf("%d",sizeof(bin));

Answer 1

sizeof()求出字节个数；sizeof(b) == 40;