Thread: help with output from array

I have everything right in this program except for the lack of one line of output. The first line of the output should have the range 1-9, but I can't figure out how to do that and have the rest print out as well. Here's the code and the output.

Code:

void showOutput(int range[], int input)
{
   int primeCount = 0;
   
   // print the headers for the table
   printf("\n%11s","Range of\n");
   printf("%9s%25s%19s\n", "Primes","Prime Numbers","Quantity");
   printf("%11s%25s%17s\n", "------------","-------------------","----------");
   
   
   for(int i = 1; i < input; i++)
   {
       // separate the values in blocks of 10
       if(i % 10 == 0)
       {
          
	  // show the current range
	  printf("%4d%2s%5d%6c",(i)," -", (i+9), ' ');
	  
	  // find the primes within the range and print them
	  for(int j = i; j <= (i+9); j++)
	      if(range[j]==1)
	      {
		  printf("%5d",j);
		  primeCount++;
	      }
	      
	  // to make sure that the quantity column's value are lined up,
	  // blank spaces are added based on how many primes were printed
	  // for that set of 10 integers
	  for(int k = primeCount; k < 4; k++)
	          printf("%5c",' ');
          
	  // print the number of primes in the set of 10
	  // and reset the counter for the next group of 10
	  printf("%12d", primeCount);
	  primeCount = 0;
	  
	  // since all of the above data was on one line,
	  // print a new line for the next set
	  printf("\n");
       }
   }
}
int main( )
{
   int input = 0, currentSpace = 0;
   
   printf("Enter the value of N: ");
   scanf("%d",&input);
   
   // define a large range of integers to test for primes
   int range[500];
   
   // set all elements to 1
   for(int i = 0; i <= input; i++)
       range[i] = 1;
   
   range[0] = range[1] = 0;
   
   for(int i=2;i <=input; i++)
   {
       if(range[i] == 1)
       {
          // if the element contains a 1
	  // remove all multiples of the number
	  // and make sure the multiples
	  // don't go above the user's input
	  currentSpace = i+i;
          while(currentSpace < input)
          {
               // set the value to zero
	       range[currentSpace] = 0;
	       
	       // set the variable to remove the next multiple
	       currentSpace += i;
	  }
       }
   }
   
   // call the function to print the formatted output
   showOutput(range,input);
       
       
   return (EXIT_SUCCESS);
}

Code:

bash-2.05$ ./primes
Enter the value of N: 200

  Range of
   Primes            Prime Numbers           Quantity
------------      -------------------       ----------
  10 -   19         11   13   17   19           4
  20 -   29         23   29                     2
  30 -   39         31   37                     2
  40 -   49         41   43   47                3
  50 -   59         53   59                     2
  60 -   69         61   67                     2
  70 -   79         71   73   79                3
  80 -   89         83   89                     2
  90 -   99         97                          1
 100 -  109        101  103  107  109           4
 110 -  119        113                          1
 120 -  129        127                          1
 130 -  139        131  137  139                3
 140 -  149        149                          1
 150 -  159        151  157                     2
 160 -  169        163  167                     2
 170 -  179        173  179                     2
 180 -  189        181                          1
 190 -  199        191  193  197  199           4

You're saying something that compiles C99 is not a C compiler? How odd.

But once you include the headers, which I assume he's just omitted for brevity, it is valid C99, and hence valid C. He is using C99 comments/declarations.

Of course, it won't compile in a C89 compiler, which are still extremely common.