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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 1;
  9.     }
  10.     if (n==2){
  11.     	return 2;
  12.     }
  13. for (i=3; i<=n; i++){
  14. 	a=2*c-2*b;
  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 0.01s 5324KB
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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/huA8nq
language:
C (gcc 8.3)
created:
10 days ago
visibility:
public

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