C语言中long类型指针类型长度到底是多少

Posted 2023-02-28 阳光Cherry梦

决于操作系统采用的是哪个C Language Data Model

在32位的操作系统下，大部分的操作系统都是采用的ILP32，因此，long是4个字节

在64位的操作系统下，Windows采用的是LLP64，long是4个字节，指针是8个字节，类Unix操作基本都是采用的LP64，因此，long是8个字节。

参考文章：64位编程模型：为什么要使用LP64

                  Data Size Neutrality and 64-bit Support

#include<stdio.h>

int main()
	char c;
	int i, *j;
	short si;
	long li;
	float f;
	double d;
	
	printf("Please input char:");//字符型 
	scanf("%c", &c);
	printf("Please input int:");//整形 
	scanf("%d", &i);
	printf("Please input short:");//短整形 
	scanf("%hd", &si);
	printf("Please input long:");//长整形 
	scanf("%ld", &li);
	printf("Please input float:");//单精度浮点型 
	scanf("%f", &f);	
	printf("Please input double:");//双精度浮点型 
	scanf("%lf", &d);	
	j = &i;
	
	printf("The char value is: %c, the size is %d:\\n", c, sizeof(c));
	printf("The int value is: %d, the size is %d:\\n", i, sizeof(i));
	printf("The short value is: %hd, the size is %d:\\n", si, sizeof(si));
	printf("The long value is: %ld, the size is %d:\\n", li, sizeof(li));
	printf("The float value is: %f, the size is %d:\\n", f, sizeof(f));
	printf("The double value is: %lf, the size is %d:\\n", d, sizeof(d));
	printf("The pointer value is: %d, the size is %d:\\n", j, sizeof(j));	

64位Windows操作系统下运行结果如下：