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  1. #include <stdio.h>
  2. //a{n} = -6a{n-1} -9a{n-2}, a{1}=1, a{2}=2(再帰あり版)
  3. int rec(int n){
  4. 	if ( n == 1 ){
  5. 		return 1;
  6. 	} else if( n == 2 ){
  7. 		return 2;
  8. 	}else {
  9. 		return -6*rec(n-1)-9*(n-2);
  10. 	}
  11.  
  12. }
  13.  
  14. int main(void) {
  15.     int n;
  16.     for( n = 1; n <= 4; n++ )
  17.     printf("数列a%dの値は%d\n", n, rec(n));
  18. 	return 0;
  19. }
  20.  
  21.  
Success #stdin #stdout 0.01s 5296KB
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Standard input is empty
stdout
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数列a1の値は1
数列a2の値は2
数列a3の値は-21
数列a4の値は108
https://ideone.com/xLQGFO
language:
C (gcc 8.3)
created:
2 days ago
visibility:
public

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