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  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.     for (i=3;i<=n;i++){
  8.    a=-2*b+2*c;
  9.    c=b;
  10.    b=a;
  11.     }   return a;
  12. }
  13. int main(void) {
  14. 	int n = 3;
  15.     printf("数列anについて, n=%dのときの値は%d\n", n, func(n));
  16. 	return 0;
  17. }
  18.  
Success #stdin #stdout 0.01s 5320KB
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Standard input is empty
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数列anについて, n=3のときの値は-2
https://ideone.com/lnwNhu
language:
C (gcc 8.3)
created:
19 days ago
visibility:
public

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