fork download 
  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. 	{
  10. 		return c;
  11. 	}
  12. 	else if(n==2)
  13. 	{
  14. 		return b;
  15. 	}
  16.  
  17. 	for(i=0;i<n;i++)
  18. 	{
  19. 		a=-2*b+2*c;
  20. 		c=b;
  21. 		b=a;
  22. 	}
  23. 	return a;
  24. }
  25.  
  26. int main(void)
  27. {
  28. 	int n = 3;
  29.     printf("数列anについて, n=%dのときの値は%d\n", n, func(n));
  30. 	return 0;
  31. }
  32.  
Success #stdin #stdout 0.01s 5316KB
comments (?)
stdin 
Standard input is empty
stdout 
数列anについて, n=3のときの値は-20
https://ideone.com/goQZ5n
language:
C (gcc 8.3)
created:
14 days ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!