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  1. #include <stdio.h>
  2. // 練習問題G
  3. int func(int n){
  4.     int a,b=2,c=1,i;
  5.     if (n==1){
  6.         return 1;}
  7.     if (n==2){
  8.         return 2;}
  9.     for (i=3;i<=n;i++){
  10.         a=-2*b+2*c;
  11.         c=b;
  12.         b=a;}
  13.     return b;}
  14. int main(void){
  15.     int n=3;
  16.     printf("数列anについてn=%dのときの値は%d\n",n,func(n));
  17.     return 0;}
Success #stdin #stdout 0s 5328KB
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数列anについてn=3のときの値は-2
https://ideone.com/gqgHLG
language:
C (gcc 8.3)
created:
1 day ago
visibility:
public

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