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  1. #include <stdio.h>
  2. //a{n} = 2a{n-1} + a{n-2}, a{1}=2, a{2}=3(再帰なし版)
  3. int z(int n){
  4. 	if(n==1){
  5. 		return 2;
  6. 	}
  7. 	if(n==2){
  8. 		return 3;
  9. 	}
  10. 	else{
  11. 		return 2*z(n-1)+z(n-2);
  12. 	}
  13.  
  14. }
  15. int main(void) {
  16.     int n = 5;
  17.    for(int i=1;i<=n;i++){
  18.     printf("数列a%dの値は%d\n", n, z(i));
  19.    }
  20. 	return 0;
  21. }
  22.  
  23.  
Success #stdin #stdout 0s 5324KB
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stdin
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Standard input is empty
stdout
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数列a5の値は2
数列a5の値は3
数列a5の値は8
数列a5の値は19
数列a5の値は46
https://ideone.com/wxFV9U
language:
C (gcc 8.3)
created:
9 days ago
visibility:
public

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