C语言内存分配(九)

来源：互联网发布：mysql select 两个表编辑：程序博客网时间：2024/05/17 01:25

#include <stdlib.h> //malloc freevoid malAndFree();void greatMal(int num);int main(int argc, const char * argv[]) {            long long *i;    long long b = 11111111111111;    i = (long long*)malloc(sizeof(long long)*3);    *i = b;        double a = 334.55f;        double *d = &a;        malAndFree();    return 0;}void malAndFree(){    //这种    double g[2000];    printf("g内存大小 = %ld",sizeof(g)); //16000bytes            greatMal(2000);    }void greatMal(int num){    //用malloc 申请的内存空间，在函数结束前进行 free，否则函数只是自动清空temp指针，而没有清空temp所指向的内存,达到上内存警告上限就会溢出    double *temp = malloc(sizeof(double)*num);    printf("temp内存大小 = %ld",sizeof(temp)); //16000bytes        double *temp2 = (double*)calloc(2000, sizeof(double));    printf("temp2内存大小 = %ld",sizeof(temp)); //16000bytes    free(temp);    free(temp2);}

0 0