C studing NO.3 while（循环），函数，数组

int main()
{
  int num = 0;
  while(num<2000)
  { 
  printf("我在敲代码\n");
  printf("%d\n", num);
  num=num+1;
     }
  if (num == 2000)
  {
    printf("你成功了\n");
  }
  return 0;
}

ADD(int x, int y)//函数块，类似plc功能块子程序
{
  int z = 0;
  z = x + y;
  return z;
}
int main()
{
  int num1 = 0;
  int num2 = 0;
  scanf("%d", &num1);
  scanf("%d", &num2);
  int num3 = ADD(num1, num2);
  printf("%d\n", num3);
  return 0;
}

int main()
{
  int i = 0;
  int arr[10] = { 1,2,3,4,5,6,7,8,9,10 };
  while (i < 10)
  {
    printf("%d\n", arr[i]);
    i++;
  }
  int o = 0;
  char ch[5] = { 'a','b','c'};//不完全初始化，剩余默认为0
  while (o < 5)
  {
    printf("%c\n", ch[o]);
    o++;
  }
  return 0;
}