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");