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  1. #include <stdio.h>
  2.  
  3. int combi(int n, int r){
  4.     if (r == 0){
  5.         return 1;}
  6.     else if(n == r){
  7.         return 1;}
  8.     else if (r == 1){
  9.         return n;}
  10.     else
  11.         {return combi(n - 1, r - 1) + combi(n - 1, r);}
  12. }
  13. int main(void){
  14.     int n, r;
  15.     n = 4, r = 2;
  16.     printf("C(n=%d, r=%d) = %d\n", n, r, combi(n, r));
  17.     return 0;
  18. }
  19.  
  20.  
Success #stdin #stdout 0.01s 5288KB
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stdin
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Standard input is empty
stdout
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C(n=4, r=2) = 6
https://ideone.com/TTd1mz
language:
C (gcc 8.3)
created:
73 days ago
visibility:
public

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