这个是要求把十进制数换成32位浮点数，可是我怎么验算了，怎么都不太对

#include<stdio.h>
       int main(){
float test = 0.0f;
int after = 0;
int i = 0;
char * b = 0;
scanf(“%d”,&after);
test = after ;
b= (char*)&test;
for (i=sizeof(test)-1;i>=0;i++);
      {
printf(“%x”, int(b[i]));
if(int(b[i]==0));
printf(“0”);
      }
return 0;
                       }