C创建数组并检查输入错误

Question

Simple question. I am trying to build a simple script that will ask you for a number. That integer will be the amount of numbers you will enter in total. Then your program finds the biggest number and the smallest. And I have build that. Easy.

  int CHECK=100;
  int a[50],size,i,max,min;

  printf("\nEnter the size of the array: ");
  scanf("%d",&size);
  printf("\nEnter %d numbers: ", size);
  for(i=0;i<size;i++)
  scanf("%d",&a[i]);
  }
  max=a[0];
  for(i=1;i<size;i++){
     if(max<a[i])
       max=a[i];
  }
 printf("\nLargest element: %d",max);
 printf("\n");
 min=a[0];
 for(i=1;i<size;i++){
  if(min>a[i])
       min=a[i];
}
printf("Smallest element: %d",small);
printf("\n");

return 0;
}

My question is, how can I tell to check for conditions. For instance, the user can input only positive numbers and smaller than 100. So if you enter -4 or 201 an Error has to be displayed telling you to try again. Any ideas as of how we can do that in a simple way. Or even point me to the right direction.

I appreciate it. Thank you.

Answer 1

It really is quite easy - at least as easy as in Python. I'm sticking with your scanf to illustrate the condition, but see @j_random_hacker's comments (++).

for(i=0; i < size; i++) {
    scanf("%d",&a[i]);
    if ( a[i] < 0 || a[i] > 99 ) {
        fprintf(stderr, "Number '%d' is out of range, try again: ", a[i]);
        i--;
    }
}

By the way you had a missing { in your code, I assume it was a transposition error. (Consistent indentation will help pickup errors like this - it is not just a good idea in Python).