数据类型及其空间大小，vs2012实测

C语言结构体内存对齐

最新推荐文章于 2025-01-20 17:28:51 发布

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最新推荐文章于 2025-01-20 17:28:51 发布

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原文链接：http://www.cnblogs.com/mylinux/p/4629882.html

本文通过一个C语言示例程序演示了不同数据类型在结构体中的内存占用情况及内存对齐规则。该程序输出了包括double、float、long等在内的基本数据类型及其自定义结构体S_DATA的大小。

#include "stdafx.h"
#include <stdio.h>
#include "common.h"
#include "t4.h"

typedef struct {
	long l;
	int i[5];
	char c;
	double db;
}S_DATA;


int t4(void)
{

	printf("size double = %d\n", sizeof(double));
	printf("size float = %d\n", sizeof(float));

	printf("size long = %d\n", sizeof(long));
	printf("size long int = %d\n", sizeof(long int));
	printf("size int = %d\n", sizeof(int));
	printf("size short int = %d\n", sizeof(short int));
	printf("size short = %d\n", sizeof(short));
	printf("size char = %d\n", sizeof(char));
	printf("size char* = %d\n", sizeof(char *));

	printf("size S_DATA = %d\n", sizeof(S_DATA));


	return 0;
}
/*
size double = 8
size float = 4
size long = 4
size long int = 4
size int = 4
size short int = 2
size short = 2
size char = 1
size char* = 4
size S_DATA = 40
Press any key to continue . . .
*/

转载于:https://www.cnblogs.com/mylinux/p/4629882.html