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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.     	else if(n==2){
  11.     		return 2;
  12.     }
  13.  
  14. 	for(i=3;i<=n;i++){
  15. 		a=-2*b+2*c;
  16. 		c=b;//anがa
  17. 		b=a;//どんどん新しい項を入れていく
  18. }
  19. 		return a;
  20. }
  21. int main(void) {
  22. 	int n = 4;
  23.     printf("数列anについて, n=%dのときの値は%d\n", n, func(n));
  24. 	return 0;
  25. }
  26.  
  27.  
  28.  
Success #stdin #stdout 0s 5316KB
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Standard input is empty
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数列anについて, n=4のときの値は8
https://ideone.com/5kiKOs
language:
C (gcc 8.3)
created:
1 day ago
visibility:
public

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