fork download
copy 
  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.     for(i = 3; i <= n; i++){
  14.         a = -2 * b + 2 * c; 
  15.         c = b;               
  16.         b = a;
  17.     }
  18.     return a;
  19. }
  20.  
  21.  
  22. int main(void) {
  23. 	int n = 3;
  24.     printf("数列anについて, n=%dのときの値は%d\n", n, func(n));
  25. 	return 0;
  26. }
  27.  
Success #stdin #stdout 0.01s 5280KB
comments (?)
stdin
copy 
Standard input is empty
stdout
copy 
数列anについて, n=3のときの値は-2
https://ideone.com/YvjJOp
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!