C sizeof 用法

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


int main(){
//printf("int length equal %d \n",sizeof(int));// print int length


int var = 100;
//printf("var length equal %d \n",sizeof(var)); //print variable
struct {int a; char b;} svar;
printf("svar length equal %d \n",sizeof(svar)); //print struct 8
}