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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 b;
  9.     if(n == 2)
  10.     	return c;
  11.     for(i=3; i<=n; i++){
  12.     	a = 2*c -2*b;
  13.     	c = b;
  14.     	b = a;
  15.     }
  16. 	return a;
  17.  
  18. }
  19. int main(void) {
  20. 	int n = 3;
  21.     printf("数列anについて, n=%dのときの値は%d\n", n, func(n));
  22. 	return 0;
  23. }
  24.  
Success #stdin #stdout 0s 5320KB
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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/P7wL4f
language:
C (gcc 8.3)
created:
1 day ago
visibility:
public

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