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  1. #include <stdio.h>
  2. void f() {} // до С89
  3.  
  4. void g(void) {} // С89
  5.  
  6. int CalcFactorial(int n) {
  7.     if (n <= 0) {
  8.         return 1;
  9.     } else {
  10.         return CalcFactorial(n - 1) * n;
  11.     }
  12. }
  13.  
  14. int CalcFibonacci(int n) {
  15.     if (n <= 1) {
  16.         return 1;
  17.     } else {
  18.         return CalcFibonacci(n - 1) +
  19.                     CalcFibonacci(n - 2);
  20.     }
  21. }
  22.  
  23. enum sequence_id {
  24.     FACTORIAL,
  25.     FIBONACCI
  26. };
  27.  
  28. int (*SelectSequence(enum sequence_id id))(int) {
  29.     if (id == FACTORIAL) {
  30.         return CalcFactorial;
  31.     }
  32.     if (id == FIBONACCI) {
  33.         return CalcFibonacci;
  34.     }
  35.     return NULL; // сердито 
  36. }
  37.  
  38. int main() {
  39.     int n = SelectSequence(FACTORIAL)(5); // n == 120
  40.     printf("n = %d\n", n);
  41.     return 0;
  42. }
  43.  
Success #stdin #stdout 0.01s 5292KB
comments (?)
stdin 
Standard input is empty
stdout 
n = 120
https://ideone.com/XZ8CDG
language:
C (gcc 8.3)
created:
8 days ago
visibility:
public

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