*****Exercise 4.1 Generate a multiplication table

Recommendation:

Exercise 4-1. Write a program that will generate a multiplication table of a size entered
by the user. a table of size 4, for instance, would have four rows and four columns. the
rows and columns would be labeled from 1 to 4. each cell in the table will contain the
product of the corresponding row and column numbers, so the value in the position
corresponding to the third row and the fourth column would contain 12.

//Exercise 4.1 Generate a multiplication table */
#include <stdio.h>

int main(void)
{
  int table_size = 0;
  int col = 0;                      // Table size        */
  int row = 0;

  printf("Enter the table size (from 2 to 12): ");
  scanf("%d", &table_size);
  //////////////////////////////////
  if(table_size > 12)
  {
    printf("Table size must not exceed 12 - setting to 12\n");
    table_size = 12;
  }
  else if(table_size < 2)
  {
    printf("Table size must be at least 2 - setting to 2\n");
    table_size = 2;
  }
/////////////////////////////////////////////////////////////////
  for(row = 0 ; row <= table_size ; ++row)
  {
    printf("\n");                      // Start new row
    for(col = 0 ; col<=table_size ; ++col)
    {
      if(row == 0)                     // 1st row?
      {                                // Yes - output column headings
        if(col == 0)                   // 1st column?
          printf("    ");              // Yes - no heading
        else
          printf("|%4d", col);         //No - output heading
      }
      else
      {                                // Not 1st row - output rows
        if(col == 0)                   // 1st column?
          printf("%4d", row);          // Yes - output row label
        else
          printf("|%4d", row*col);     // No - output table entry
      }
    }
    if(row == 0 )                      // If we just completed 1st row
    {                                  // output separator dashes
      printf("\n");
      for(col = 0 ; col <= table_size ; ++col)
        printf("_____");
    }
  }
  printf("\n");
    return 0;

}