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  1. #include <stdio.h>
  2. main ()
  3. {
  4.  
  5.    int n;         /* a number */
  6.    int tri_num;   /* the triangular value of the number */
  7.  
  8.    printf ("TABLE OF TRIANGULAR NUMBERS by 5\n\n");
  9.    printf (" n     Triangular Number\n");
  10.    printf ("---    -----------------\n");
  11.  
  12.    tri_num = 0;
  13.  
  14.    for (n = 5; n <= 50; n = n + 5)  /* or n+= 5 */
  15.    {
  16.        tri_num = (n * (n + 1))/2;
  17.        printf (" %d        %d\n", n, tri_num);
  18.    }
  19.    return (0);
  20. }
Success #stdin #stdout 0s 5288KB
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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/zgTrIT
language:
C++ (gcc 8.3)
created:
12 days ago
visibility:
public

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