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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.  
  8.     if(n==1){
  9.     	return 1;
  10.     }
  11.     else if(n==2){
  12.     	return 2;
  13.     }
  14.     else{
  15.     	for(i=2; i<n; i++){
  16.     		a = -2*b + 2*c;
  17.     		c = b;
  18.     		b = a;
  19.     	}
  20.     	return a;
  21.     }
  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 5320KB
comments (?)
stdin 
Standard input is empty
stdout 
数列anについて, n=3のときの値は-2
https://ideone.com/lOsZd1
language:
C (gcc 8.3)
created:
4 days ago
visibility:
public

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