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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. else
  15. for(i=0;i<n;i++)
  16. {
  17. a=-2*b+2*c;
  18. c=b;
  19. b=a;}
  20. return a;
  21.  
  22. }
  23. int main(void) {
  24. 	int n = 3;
  25.     printf("数列anについて, n=%dのときの値は%d\n", n, func(n));
  26. 	return 0;
  27. }
  28.  
Success #stdin #stdout 0.01s 5312KB
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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-20
https://ideone.com/wpB8Eh
language:
C (gcc 8.3)
created:
3 days ago
visibility:
public

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