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  1. /* with a for loop */
  2. #include <stdio.h>
  3. int main ()
  4. {
  5.  
  6.     int n;             /* loop index */
  7.     int tri_num;   /* calculated triangular number value */
  8.  
  9.     printf ("TABLE OF TRIANGULAR NUMBERS by 5\n\n");
  10.     printf (" n     Triangular Number\n");
  11.     printf ("---    -----------------\n");
  12.  
  13.     tri_num = 0;
  14.  
  15.     /* use a for loop */
  16.     for (n = 5; n <= 100; ++n)  /* or n+= 5 */
  17.     {
  18.         tri_num = (n * (n + 1))/2;
  19.         printf (" %d        %d\n", n, tri_num);
  20.     }
  21.  
  22.     return (0);
  23. }
  24.  
Success #stdin #stdout 0.01s 5532KB
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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
 6        21
 7        28
 8        36
 9        45
 10        55
 11        66
 12        78
 13        91
 14        105
 15        120
 16        136
 17        153
 18        171
 19        190
 20        210
 21        231
 22        253
 23        276
 24        300
 25        325
 26        351
 27        378
 28        406
 29        435
 30        465
 31        496
 32        528
 33        561
 34        595
 35        630
 36        666
 37        703
 38        741
 39        780
 40        820
 41        861
 42        903
 43        946
 44        990
 45        1035
 46        1081
 47        1128
 48        1176
 49        1225
 50        1275
 51        1326
 52        1378
 53        1431
 54        1485
 55        1540
 56        1596
 57        1653
 58        1711
 59        1770
 60        1830
 61        1891
 62        1953
 63        2016
 64        2080
 65        2145
 66        2211
 67        2278
 68        2346
 69        2415
 70        2485
 71        2556
 72        2628
 73        2701
 74        2775
 75        2850
 76        2926
 77        3003
 78        3081
 79        3160
 80        3240
 81        3321
 82        3403
 83        3486
 84        3570
 85        3655
 86        3741
 87        3828
 88        3916
 89        4005
 90        4095
 91        4186
 92        4278
 93        4371
 94        4465
 95        4560
 96        4656
 97        4753
 98        4851
 99        4950
 100        5050
https://ideone.com/Cv94hs
language:
C (gcc 8.3)
created:
1 year ago
visibility:
public

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