fork download 
  1. #include <stdio.h>
  2. //練習問題G
  3.  
  4. int func(int n){
  5.     int a, b=2, c=1;
  6.     int i;
  7.     if(n==1){
  8.     	return c;
  9.     }
  10.     if(n==2){
  11.     	return b;
  12.     }
  13.     else for(i=3;i<=n;i++){
  14.     	a=2*c-2*b;
  15.     	c=b;
  16.     	b=a;
  17.     }
  18. return a;
  19.  
  20. }
  21. int main(void) {
  22. 	int n = 3;
  23.     printf("数列anについて, n=%dのときの値は%d\n", n, func(n));
  24. 	return 0;
  25. }
  26.  
Success #stdin #stdout 0s 5324KB
comments (?)
stdin 
Standard input is empty
stdout 
数列anについて, n=3のときの値は-2
https://ideone.com/pXKmq6
language:
C (gcc 8.3)
created:
18 days 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!