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 <stdio.h> #include <malloc.h> 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