C语言获取各类型在内存中占用的存储单元

#include <stdio.h>
void main()
{
    printf("An int is %d bytes\n",sizeof(int));
    printf("A short is %d bytes\n",sizeof(short));
    printf("A long is %d bytes\n",sizeof(long));
    printf("An unsigned int is %d bytes\n",sizeof(unsigned int));
    printf("An unsigned short is %d bytes\n",sizeof(unsigned short));
    printf("An unsigned long is %d bytes\n\n",sizeof(unsigned long));
    printf("A float is %d bytes\n",sizeof(float));
    printf("A double is %d bytes\n\n",sizeof(double));
    printf("A char is %d bytes\n",sizeof(char));
    printf("An unsigned char is %d bytes\n",sizeof(unsigned char));
}