fork download
copy 
  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 1;
  9. 	} else if(n == 2) {
  10. 		return 2;
  11. 	} else {
  12. 		for(i = 2; i < n;i++) {
  13. 			a = -2 * b + 2 *c;
  14. 			c = b;
  15. 			b = a;
  16. 		}
  17. 	return a;
  18. 	}
  19. }
  20. int main(void) {
  21. 	int n = 3;
  22.     printf("数列anについて, n=%dのときの値は%d\n", n, func(n));
  23. 	return 0;
  24. }
  25.  
Success #stdin #stdout 0s 5316KB
comments (?)
stdin
copy 
Standard input is empty
stdout
copy 
数列anについて, n=3のときの値は-2
https://ideone.com/7EQwhn
language:
C (gcc 8.3)
created:
10 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!