C/C++基础 (malloc , free)

原创于 2018-11-14 13:13:54 发布 · 594 阅读

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#C/C++基础

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本文通过C语言代码示例，详细介绍了如何使用malloc进行内存分配，并展示了通过结构体进行复杂数据类型操作的方法，包括购买、丢弃和销售等场景。

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

int main() {
	auto p = (char*)malloc(8);
	for (int i = 0; i < 8; i++) {
		p[i] = i + 1;
	}
	free(p);
	return 0;
}

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

struct Car {
	char maker[32];
	int price;
};

struct Citizen {
	char name[32];
	int deposite;
	Car* car;
};

void buy(Citizen* owner) {
	Car* car = (Car*)malloc(sizeof(Car));
	strcpy(car->maker, "Chevrolet");
	car->price = 10;
	owner->car = car;
	owner->deposite -= car->price;
}

void discard(Citizen* who) {
	free(who->car);
	who->car = NULL;
}
void sell(Citizen* owner, Citizen* other) {
	Car* car = owner->car;
	car->price *= 0.5;
	other->car = car;
	owner->deposite += car->price;
	other->deposite -= car->price;
	owner->car = NULL;

}
int main()
{
	Citizen shaofa = { "shaofa" ,100,NULL};
	buy(&shaofa);
	discard(&shaofa);
	Citizen anybody = { "xxxx",1000,NULL };
	sell(&shaofa,&anybody);
	//int a[3];
	//a[0] = 10;
	//a[1] = 1000;
	//a[2] = sizeof(a);
	return 0;
}