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  1. #include <stdio.h>
  2.  
  3. int combi(int n, int r){
  4.    if(r==0){
  5.    return 0;
  6.    }
  7.    else if(n==r){
  8.    	return 0;
  9.    }
  10.    else if(r==1){
  11.    	return n;
  12.    }
  13.    else{
  14.    	return combi(n-1,n-r)+combi(n-1,r);
  15.    }
  16.  
  17. }
  18. int main(void){
  19.     int n, r;
  20.     n = 4, r = 2;
  21.     printf("C(n=%d, r=%d) = %d\n", n, r, combi(n, r));
  22.     return 0;
  23. }
  24.  
  25.  
Success #stdin #stdout 0.01s 5276KB
comments (?)
stdin 
Standard input is empty
stdout 
C(n=4, r=2) = 4
https://ideone.com/c8RsUg
language:
C (gcc 8.3)
created:
72 days ago
visibility:
public

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