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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. {
  9. return 1;}
  10.  
  11. else if(n==2)
  12. {
  13. return 2;}
  14. for(i=0;i<n;i++)
  15. {
  16. a=-2*b+2*c;
  17. c=b;
  18. b=a;}
  19. return a;
  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 5316KB
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数列anについて, n=3のときの値は-20
https://ideone.com/Pyvl44
language:
C (gcc 8.3)
created:
3 days ago
visibility:
public

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