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  1. #include <stdio.h>//第1講演習 2-1
  2.  
  3. int conb(int n, int r){
  4. 	int i,j,a,b;
  5. 	for(i=n,j=r,a=1,b=1;j>=1;i--,j--){
  6. 		a=a*i;
  7. 		b=b*j;
  8. 	}
  9. 	return a/b;
  10. }
  11. int main() {
  12. 	int n,r,k;
  13. 	n=5;
  14. 	r=2;
  15. 	k=conb(n,r);
  16. 	printf("%dC%d=%d",n,r,k);
  17. 	return 0;
  18. }
  19.  
Success #stdin #stdout 0s 5288KB
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stdin
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Standard input is empty
stdout
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5C2=10
https://ideone.com/m2aTOL
language:
C (gcc 8.3)
created:
4 days ago
visibility:
public

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