2_C语言中的数据类型 （三）整数与无符号数

#include <stdio.h>

int main()
{
    int a = 10;//4个字节大小short b = 10;
    printf("%d\n", sizeof(b));
    long c = 10;
    printf("%d\n", sizeof(c));
    longlong d = 10;
    printf("%d\n", sizeof(d));
    unsigned int e = 10;//unsigned是关键字，代表是无符号数的意思
    printf("%d\n", sizeof(e));

    //unsigned short f;//无符号的short
    //unsigned long g;//无符号的long
    //unsigned long long i;//无符号的long long

    //int i1;
    unsigned short abc = 0xffff;
    abc = abc + 1 + 99;
    printf("%d\n", abc);

    abc = 2;
    abc = abc - 5;
    printf("%d\n", abc);

    int i1 = 0x12345678;
    abc = i1;
    printf("%x\n", abc);

    short abc1 = -2;
    i1 = abc1;
    printf("%x\n", i1);

    unsigned short abc2 = 0;
    abc2 = abc2 - 1;
    printf("%d\n", abc2);

    int a1 = 0x12345678;
    printf("%p\n", &a1);//%p的意思是显示一个内存的地址，&a1代表变量a1的地址编号return0;
}