fork download
copy 
  1. #include <stdio.h>
  2.  
  3. int factorial(int x){
  4.       int fact =1;
  5.       for( int i=1;i<=x;i++){
  6.           fact= fact*i;
  7.           }
  8.       return fact;
  9.   }
  10. int combination (int n,int r){
  11.        int ncr=factorial(n)/(factorial(r)*factorial(n-r));   
  12.   return ncr;
  13.   }
  14.  
  15. int main() {
  16.  
  17.      int n;
  18.      printf("Enter the n: \n");
  19.      scanf("%d",&n);
  20.  
  21.      int r;
  22.      printf("Enter the r: \n");
  23.      scanf("%d",&r);
  24.  
  25.      int ncr= combination(n,r);
  26.      printf("The answer is %d",ncr);
  27.  
  28. 	return 0;
  29. }
Success #stdin #stdout 0.01s 5280KB
comments (?)
stdin
copy 
4
2
stdout
copy 
Enter the n: 
Enter the r: 
The answer is 6
https://ideone.com/2EpkFN
language:
C (gcc 8.3)
created:
10 hours ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!