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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.     if(n==1){
  8.     	return c;
  9.     }
  10.     else 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. int main(void) {
  21. 	int n = 3;
  22.     printf("数列anについて, n=%dのときの値は%d\n", n, func(n));
  23. 	return 0;
  24. }
  25.  
Success #stdin #stdout 0s 5288KB
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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/OgA5Wb
language:
C (gcc 8.3)
created:
3 days ago
visibility:
public

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