C语言中计算变量占用内存空间

在C语言中通常用【sizeof】运算符计算变量占内存空间，如下面的例子：

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#include <stdio.h>
#include <stdlib.h>
int main()
{
    char ch;
    short a;
    int b;
    long c ;
    double e;
    float d;
    //赋值
    ch = 'a';
    a = ;
    b = ;
    c= ;
    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 ;
}