深入理解C语言指针类型

C语言指针类型

      这部分内容其实很简单，本来不想写的，但是一开始我还真没理解指针类型，所以后来想想还是写一个吧！得了废话少说直接上代码

#include
#include
int main()
{
unsigned char ff = 4;
unsigned char ee = 3;
unsigned char dd = 2;
unsigned char cc = 1;
int* p = (int *)&cc; //定义一个int类型指针，指向cc变量地址
printf("cc = %p\ndd = %p\nee = %p\nff = %p\n\np = %p\n\n",&cc,&dd,&ee,&ff,p);
//打印地址：cc = 0xbfb1664c 注意这个地址可能每次运行都是变化的，因为它是局部变量，所以每次都是变化的
// dd = 0xbfb1664d
// ee = 0xbfb1664e
// ff = 0xbfb1664f
//
// p = 0xbfb1664c
//
//显然是他们地址都是挨着呢! cc变量的地址是首地址，而且前面定义的p指针也指向cc

printf("cc = %d\n", cc); //cc = 1
printf("dd = %d\n", dd); //dd = 2
printf("ee = %d\n", ee); //ee = 3
printf("ff = %d\n\n", ff); //ff = 4

printf("*p = 0x%.8x\n\n",*p);//打印输出*p = 0x04040201;

*p = 3;

printf("cc = %d\n", cc); //cc = 3
printf("dd = %d\n", dd); //dd = 0
printf("ee = %d\n", ee); //ee = 0
printf("ff = %d\n\n", ff); //ff = 0
printf("*p = 0x%.8x\n\n",*p);//*p = 0x0000003

*p = 300;

printf("cc = %x\n", cc); //cc = 2c
printf("dd = %x\n", dd); //dd = 1
printf("ee = %x\n", ee); //ee = 0
printf("ff = %x\n", ff); //ff = 0
printf("*p = 0x%.8x\n\n",*p);//*p = 0x0000012c //这里0x012c十进制就等于 = 300

return 0;
}

看下终端输出：

上面程序里面注释已经写得非常清楚了，所以不讲了

总结：指针类型其实就是按照内存地址取几个字节，char就取1个字节，short就取2个字节，int就取4个字节

          但是这些类型又跟编译器、操作系统有关系

参考资料是“狄泰软件C语言进阶教程”