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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 1;
  9. 	}
  10. 	if(n==2) {
  11. 		return 2;
  12. 	}
  13.  
  14. 	for(int i=3; i<=n; i++){
  15. 		a=-2*b+2*c;
  16. 		b=c;
  17. 		c=a;
  18. 	}
  19. 	return c;
  20. }
  21.  
  22. int main(void) {
  23. 	int n = 3;
  24.     printf("数列anについて, n=%dのときの値は%d\n", n, func(n));
  25. 	return 0;
  26. }
  27.  
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/u5Mmnd
language:
C (gcc 8.3)
created:
1 day ago
visibility:
public

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