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  1. #include <stdio.h>
  2.  
  3. int main(void) 
  4. {
  5. 	int num;
  6. 	int tri_num;
  7.  
  8. 	printf ("TABLE OF TRIANGULAR NUMBERS by 5\n\\n");
  9. 	printf (" num     Triangular Number\n");
  10. 	printf ("---    -----------------\n");
  11.  
  12. 	tri_num = 0;
  13. 	num = 5;
  14. 	while (num <= 50)
  15. 	{
  16. 		tri_num = (num * (num + 1))/2;
  17. 		printf (" %d        %d\n", num, tri_num);
  18. 		num = num +5;
  19. 	}
  20.  
  21. 	return 0;
  22. }
  23.  
Success #stdin #stdout 0s 5320KB
comments (?)
stdin 
Standard input is empty
stdout 
TABLE OF TRIANGULAR NUMBERS by 5
\n num     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/YMVGeS
language:
C (gcc 8.3)
created:
4 hours ago
visibility:
public

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