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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. {return 2;}
  13.  
  14. for(i=0;i<n;i++)
  15. a=-2*b+2*c;
  16.  
  17. c=b;
  18. b=a;
  19.  
  20. return a;
  21.  
  22.  
  23.  
  24. }
  25. int main(void) {
  26. 	int n = 3;
  27.     printf("数列anについて, n=%dのときの値は%d\n", n, func(n));
  28. 	return 0;
  29. }
  30.  
Success #stdin #stdout 0.01s 5288KB
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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/A1xDu3
language:
C (gcc 8.3)
created:
4 days ago
visibility:
public

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