fork download
copy 
  1. #include <stdio.h>
  2.  
  3. int main(void) {
  4.     int n = 4;
  5.     int a, b = 3, c = 2;  // b = a[n-1], c = a[n-2]
  6.  
  7.     for(int i = 3; i <= n; i++){
  8.         a = 2*b + c;  
  9.         c = b;        
  10.         b = a;       
  11.     }
  12.  
  13.     printf("数列a%dの値は%d\n", n, a);
  14.     return 0;
  15. }
  16.  
  17.  
  18.  
Success #stdin #stdout 0s 5324KB
comments (?)
stdin
copy 
Standard input is empty
stdout
copy 
数列a4の値は19
https://ideone.com/xqTe3l
language:
C (gcc 8.3)
created:
19 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!