C语言的联合与结构体内存分配小例子代码,C代码库,德仔网

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【C】 C语言的联合与结构体内存分配小例子

作者:yangzhiyong / 发布于2012/11/20/ 758

/*
 ============================================================================
 Name        : CHello.c
 Author      : Yang Zhiyong
 Version     : Test
 Copyright   : Your copyright notice
 Description : Hello World in C, Ansi-style
 ============================================================================
 */

#include <stdio.h>
#include <stdlib.h>

struct S_Person {
	char * name;
	int age;
} person, *p;

union U_Person {
	char * name;
	int age;
} u_person, *u_p;

int main(void) {

	p = (struct S_Person *) malloc(sizeof(struct S_Person));
	if (p == NULL ) {
		exit(1);
	}
	p->age = 10;
	printf("age = %d\n", p->age);

	p->name = (char *) malloc(sizeof(char) * 20);
	if ( p->name == NULL )
	{
		exit(1);
	}
	sprintf(p->name, "%s", "杨志永");
	printf("name = %s\n", p->name);

	//释放内存的顺序与分配内存的顺序相反。不论是多少层次
	free(p->name);
	free(p);
	p = NULL;

	u_p = (union U_Person *) malloc(sizeof(union U_Person));
	if ( u_p == NULL )
	{
		exit(1);
	}
	u_p->age = 20;
	printf("union age = %d\n", u_p->age);

	u_p->name = (char *) malloc(sizeof(char) * 20);
	if ( u_p->name == NULL )
	{
		exit(1);
	}
	sprintf(u_p->name, "%s", "yangzhiyong");
	printf("union name = %s\n", u_p->name);

	//释放内存的顺序与分配内存的顺序相反。不论是多少层次
	free(u_p->name);
	free(u_p);
	u_p = NULL;


	return EXIT_SUCCESS;
}

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　内存分配小　

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