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  1. #include <stdio.h> 
  2.  
  3. /* no prototype needed, but add them here if desired */ 
  4. int Triangular_Number (int); 
  5.  
  6. //*********************************************************************
  7. // 
  8. // Function: Triangular_Number 
  9. // 
  10. // Description: A triangular number can be generated by the 
  11. // the following formula: 
  12. // 
  13. // Triangular number = n (n + 1) / 2 
  14. // 
  15. // This function will return the triangular number 
  16. // calculated based it being passed an integer value 
  17. // 
  18. // Parameters: theNumber - An integer value to start the 
  19. // calculation of the Triangular Number. 
  20. // 
  21. // Returns: The Triangular Number that is calculated 
  22. // 
  23. //*********************************************************************
  24.  
  25. int Triangular_Number (int theNumber) 
  26. { 
  27.  
  28.     int tri_num; /* triangular number to be calculated */ 
  29.  
  30.     /* Calculate the Triangular Number */ 
  31.     tri_num = (theNumber * (theNumber + 1))/2; 
  32.  
  33.     /* return to the calling function */ 
  34.     return(tri_num); 
  35.  
  36. } /* end Triangular_Number */ 
  37.  
  38.  
  39. int main (void) 
  40. { 
  41.  
  42.     int n;       /* a number to calculate a triangular number */ 
  43.     int tri_num; /* The triangular number calculated from n */
  44.  
  45.     printf ("TABLE OF TRIANGULAR NUMBERS from 5 to 50 by 5\n\n"); 
  46.     printf (" n  Triangular Number\n"); 
  47.     printf ("--- -----------------\n"); 
  48.  
  49.     tri_num = 0; 
  50.  
  51.     /* Calculate and print triangular numbers from 5 to 50 in steps of 5 */ 
  52.     for (n = 5; n <= 50; n += 5) 
  53.     { 
  54.  
  55.         printf (" %-5i %-5i\n", n, Triangular_Number(n)); 
  56.     } 
  57.  
  58.     return (0); /* indicate successful completion */ 
  59.  
  60. } /* end main */
Success #stdin #stdout 0s 5316KB
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stdout
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TABLE OF TRIANGULAR NUMBERS from 5 to 50 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/OZkCLs
language:
C (gcc 8.3)
created:
19 hours ago
visibility:
public

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