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  1. #include <stdio.h>
  2. //練習問題G
  3.  
  4.  
  5. int func(int n){
  6. 	 int a, b=2, c=1;
  7.     int i;
  8. 	if(n==1){
  9. 		return 1;
  10. 	}else if(n==2){
  11. 		return 2;
  12. 	}
  13. 	else{
  14.  
  15.     for(i=3;i<=n;i++){
  16.     	a=2*c-2*b;
  17.     	c=b;
  18.     	b=a;
  19.  
  20.     }
  21.     return a;
  22.  
  23. }
  24. }
  25. int main(void) {
  26. 	int n = 3;
  27.     printf("数列anについて, n=%dのときの値は%d\n", n, func(n));
  28. 	return 0;
  29. }
  30.  
Success #stdin #stdout 0s 5312KB
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数列anについて, n=3のときの値は-2
https://ideone.com/Fv6oga
language:
C (gcc 8.3)
created:
1 day ago
visibility:
public

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