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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)return 1;
  8. if(n==2)return 2;
  9.  
  10. for(i=3;i<=n;i++){
  11. a=2*c-2*b;
  12. c=b;
  13. b=a;
  14. }
  15. return a;
  16. }
  17. int main(void) {
  18. 	int n = 3;
  19.     printf("数列anについて, n=%dのときの値は%d\n", n, func(n));
  20. 	return 0;
  21. }
  22.  
Success #stdin #stdout 0s 5332KB
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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/h9cmjF
language:
C (gcc 8.3)
created:
14 days ago
visibility:
public

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