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  1. #include <stdio.h>
  2. // prototype
  3. int siguma_for(int n);
  4. int siguma_while(int n);
  5. int siguma_do(int n);
  6. int siguma_rec(int n);
  7.  
  8. int siguma_for(int n)
  9. {
  10.     int r = 0;
  11.     for (int i = 1; i <= n; ++i)
  12.         r += i;
  13.     return r;
  14. }
  15.  
  16. int siguma_while(int n)
  17. {
  18.     int r = 0;
  19.     while (n)
  20.         r += n--;
  21.     return r;
  22. }
  23.  
  24. int siguma_do(int n)
  25. {
  26.     int r = 0;
  27.     do r += n;
  28.     while (--n);
  29.     return r;
  30. }
  31.  
  32. int siguma_rec(int n)
  33. {
  34.     return n ? n + siguma_rec(n - 1) : 0;
  35. }
  36.  
  37. int main(void)
  38. {
  39.     int n = 10;
  40.     printf("%d %d %d %d\n",
  41.            siguma_for(n),
  42.            siguma_while(n),
  43.            siguma_do(n),
  44.            siguma_rec(n) );
  45.     return 0;
  46. }
  47.  
Success #stdin #stdout 0s 2248KB
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55 55 55 55
https://ideone.com/73bLNY
language:
C99 (gcc 8.3)
created:
10 years ago
visibility:
secret

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