C語言中計算變量占用內存空間

在C語言中通常用【sizeof】運算符計算變量占內存空間，如下面的例子：

 

#include <stdio.h>
#include <stdlib.h>
int main()
{
    char ch;
    short a;
    int b;
    long c ;
    double e;
    float d;
    //賦值
    ch = 'a';
    a = 1;
    b = 2;
    c= 3;
    d = 1.5;
    e = 1.5;
    
    printf("%d\n",sizeof(char));
    printf("%d\n",sizeof(short));
    printf("%d\n",sizeof(int));
    printf("%d\n",sizeof(long));
    printf("%d\n",sizeof(float));
    printf("%d\n",sizeof(double));
    
    printf("%d\n",sizeof(ch));
    printf("%d\n",sizeof(a));
    printf("%d\n",sizeof(b));
    printf("%d\n",sizeof(c)); 
    printf("%d\n",sizeof(d));
    printf("%d\n",sizeof(e));
    system("pause");
    return 0;
}