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1、32为机器和64位机器是什么意思？
32位机器是指处理器一次能处理的最大位数是32位，通常指CPU里面的通用寄存器的数据宽度是32个比特位。而64位机器表示一次能处理的最大数据位数是64位。
32位机器最大寻址地址空间是2^32次方个内存单元（4G），注意1G=2^30，而每个内存单元大小都是一个字节，所以32位机器最大寻址空间是4GB。
而64位机器最大寻址空间是4GB^32，这个数字相当庞大，通常只能寻址到128GB。
为什么32位机器上指针大小是4个字节，64位机器上是8个细节？
很简单，因为32位机器的寻址地址空间是4G，每个地址是32位，恰好是4个字节。即指针大小是4个字节。而64位机器的每个地址是64位是8个字节，因此指针是8个字节。
#include <stdio.h> #include<stdlib.h> #include <math.h> int main() {
printf("%d\n", sizeof(char*)); printf("%d\n", sizeof(int*)); printf("%d\n",
sizeof(float*)); printf("%d\n", sizeof(double*)); return 0; }
运行结果：
