动态内存分配

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原创最新推荐文章于 2026-07-09 13:20:14 发布 419 阅读 AI 写同款· GEO 优化 ›

用内存动态分配记录每天的6个浮点温度，并求平均温度 #include<stdio.h> #include<stdlib.h> #include<ctype.h> //1，开辟每天的温度和天数内存，平均温度2，输入温度，并把温度放入天上3，计算平均温度 int main() { int tian = 0; int shiji = tian + 1; int mei = 6; doublepmei = (double... 阅读详情

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

//malloc()
//calloc()
void main1()
{
	int num;
	scanf_s("%d", &num);

	//double *p = (double *)malloc(sizeof(double)*num);
	double *p = (double *)calloc(num, sizeof(double));
	
	for (double *pnum = p, i = 0.0; pnum < p + num; pnum++, i+=1.0)
	{
		pnum[(int)i] = i;
		printf("%lf\n", pnum[(int)i]);
	}
	
	double number = 99;
	number++;				//浮点类型数据也可以用自增运算符
	printf("%lf\n", number);

	free(p);

	system("pause");
}

//动态增加的数组
//realloc
void main()
{
	int num;
	scanf_s("%d", &num);

	int *p = (int *)malloc(sizeof(int)*num);
	printf("%x\n", p);

	for (int i = 0; i < num; i++)
	{
		p[i] = i;
		printf("%d,%x\n", p[i], p + i);
	}

	int newnum;
	scanf_s("%d", &newnum);
												//分配内存空间字节数：(newnum-num)*sizeof(int)
	int *newp = realloc(p, newnum);				//newnum即数组元素个数增加到多少
	printf("\nnewp = %p\n", newp);				//newp的值等于p，仍然是数组的首地址
	for (int i = num; i < newnum; i++)
	{
		newp[i] = i;
		printf("%d,%x\n", newp[i], &newp[i]);
	}

	system("pause");
}

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