#include <stdio.h>

/* Print a section of the ASCII table */

#define  MIN   0
#define  MAX   127

int main()
{
  int  low, high;
  char ch;

  while (1)
  {
    printf("Enter bounds (low high): ");
    scanf("%d %d", &low, &high);

    if ((low >= MIN) && (high <= MAX) 
       && (low < high))
    {
      break;
    }
    else
    {
      printf("Bad bounds. Try again.\n");
    }
  }

  ch = low;
  for (;;)
  {
    printf("%d: %c\n", ch, ch);
    
    ch++;
    if (ch > high)
    {
      break;
    }
  }

  return 0;
}