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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) return 1;
  8. if(n==2) return 2;
  9.  
  10. for(i=3;i<=n;i++){
  11. c=2*a-2*b;
  12. a=b;
  13. b=c;
  14. 	}
  15. return b;
  16.  
  17. }
  18. int main(void) {
  19. 	int n = 3;
  20.     printf("数列anについて, n=%dのときの値は%d\n", n, func(n));
  21. 	return 0;
  22. }
  23.  
Success #stdin #stdout 0s 5324KB
comments (?)
stdin 
Standard input is empty
stdout 
数列anについて, n=3のときの値は-4
https://ideone.com/6xvd1L
language:
C (gcc 8.3)
created:
12 days ago
visibility:
public

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