你能在运行时用C定义数组的大小 [英] Can you define the size of an array at runtime in C

问题描述

新的C，非常感谢帮助。

New to C, thanks a lot for help.

是否有可能在C中定义阵列时不指定任何它的大小或对其进行初始化。

Is it possible to define an array in C without either specifying its size or initializing it.

例如，我可以提示用户输入数字，并将其存储在一个int数组？我不知道他们有多少人数将事先输入。

For example, can I prompt a user to enter numbers and store them in an int array ? I won't know how many numbers they will enter beforehand.

我现在能想到的唯一的办法是定义一个最大尺寸，这不是一个理想的解决方案...

The only way I can think of now is to define a max size, which is not an ideal solution...

推荐答案

好了，你可以动态分配的大小：

Well, you can dynamically allocate the size:

#include <stdio.h>

int main(int argc, char *argv[])
{
  int *array;
  int cnt;
  int i;

  /* In the real world, you should do a lot more error checking than this */
  printf("enter the amount\n");
  scanf("%d", &cnt);

  array = malloc(cnt * sizeof(int));

  /* do stuff with it */
  for(i=0; i < cnt; i++)
    array[i] = 10*i;

  for(i=0; i < cnt; i++)
    printf("array[%d] = %d\n", i, array[i]);

  free(array);

  return 0;
}

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