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  1. #include <stdio.h>
  2. //練習問題G
  3.  
  4. int func(int n){
  5. 	if(n==1){
  6. 		return 1;
  7. 	}
  8. 	else if(n==2){
  9. 		return 2;
  10. 	}
  11. 	else{
  12.     int a, b=2, c=1;
  13.     int i;
  14.     for(i=2;i<n;i++){
  15.     	a=-2*b+2*c;
  16.     	c=b;
  17.     	b=a;
  18.  
  19.     }
  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 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/bDp751
language:
C (gcc 8.3)
created:
7 days ago
visibility:
public

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