动态内存管理malloc

#include<stdio.h>

#include<string.h>

#include <stdlib.h>

#pragma warning(disable : 4996)

//动态内存管理

//定义数组内存固定的，但是有时候数组不能确定个数，所以用动态内存

int main(int argc, const char *argv[])

{

char charArray[100];

char *charP;

strcpy(charArray,"CharArray");

charP = (char*)malloc(500*sizeof(charP));

if (charP == NULL)

{

printf("没有分配到相应内存\n");

}

else {

strcpy(charP, "成功分配了动态内存");

}

printf("charArray = %s\n", charArray);

printf("charP = %s\n", charP);

charP = (char*)realloc(charP,200*sizeof(char));

if (charP == NULL)

{

printf("重新分配内存失败\n");

}

else {

strcat(charP, "成功重新分配内存");

}

printf("charArray = %s\n", charArray);

printf("charP = %s\n", charP);

free(charP); //释放指针内存

return 0;

}