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  1. #include <stdio.h>
  2. int main ()
  3. {
  4. 	int n; // a number
  5. 	int tri_num; // the triangular value of the number
  6.  
  7. 	printf ("TABLE OF TRIANGULAR NUMBERS by 5\n\n");
  8. 	printf ("  n	  Triangular Number\n");
  9. 	printf ("  ---   ------------------\n");
  10.  
  11. 	tri_num = 0;
  12.  
  13. 	for (n = 5; n <= 50; n = n + 5) // or n += 5
  14. 	{
  15. 		tri_num = (n * (n + 1))/2;
  16. 		printf ("   %d		  %d\n" , n, tri_num);
  17. 	}
  18. 	return (0);
  19. } // end main
Success #stdin #stdout 0.01s 5304KB
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stdin
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Standard input is empty
stdout
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TABLE OF TRIANGULAR NUMBERS by 5

  n	  Triangular Number
  ---   ------------------
   5		  15
   10		  55
   15		  120
   20		  210
   25		  325
   30		  465
   35		  630
   40		  820
   45		  1035
   50		  1275
https://ideone.com/vFUy01
language:
C (clang 8.0)
created:
22 hours ago
visibility:
public

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