Input validation check for one integer

[aznluvsmc]

I'd like to do a simple input validation check to see if the user entered ONLY one integer.

The code I current have is as follows

#include <stdio.h>

int main(void)
  {
  int array[10] = {0};
  int i, rv;
  char c1;

  for(i = 0; i < 10; i++)
    {
    printf("Enter an integer: ");
    while(scanf("%d%c", &array[i], &c1) != 2 || !isspace(c1))
      {
      printf("Please enter only one integer: ");
      while(getchar() != '\n');
      }
    }   

  for(i = 0; i < 10; i++)
    printf("%d ", array[i]);
   
  printf("\n");
  return 0;
}

The program should allow any leading white spaces before the number and any trailing white spaces after the number.

However it should not allow an integer followed by white space followed by another integer which it currently does.

Any help would be appreciated.

 

[DaveSinkula]

I had this lying around from some tinkering the other day...

#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#include <limits.h>

int main()
{
   int value;
   for ( ;; )
   {
      char line[sizeof(value) * (CHAR_BIT * 12655UL) / 42039 + 3];
      fputs("Input an integer: ", stdout);
      fflush(stdout);
      if ( fgets(line, sizeof line, stdin) != NULL )
      {
         if ( !isspace(*line) )
         {
            char *end;
            value = strtol(line, &end, 10);
            if ( *end == '\n' || *end == '\0' )
            {
               break;
            }
         }
      }
      puts("ERROR: Try again.");
   }
   printf("value = %d\n", value);
   return 0;
}