malloc的使用、用malloc动态分配内存以适应用户的需求的源代码实例

int len;

   int i = ;

   printf("please enter the size that you want: ");

   scanf("%d", &len);

   int *pArr = (int*)malloc(sizeof(int) * len);

   printf("please cin the elements:\n");

   for(i = ; i < len; i++)

   {

      scanf("%d", &pArr[i]);

   }

   for(i = ; i < len; i++)

   {

      printf("%d ", pArr[i]);

   }

   printf("\n");