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  1. #include <stdio.h>
  2.  
  3.     int c;
  4. int rec(int n){
  5. 	c++;
  6. 	if(n==1){
  7. 	 return 1;
  8. }else if(n==2){
  9. 	return 2;
  10. }else{
  11. 	return -6*rec(n-1)-9*rec(n-2);
  12. }
  13.  
  14. }
  15. int main(void) {
  16. 	int n=5;
  17. 	printf("数列a%dの和の値は%d\n",n,rec(n));
  18. 	printf("recの呼び出し回数は%d\n",c);
  19. 	return 0;
  20. }
  21.  
Success #stdin #stdout 0s 5320KB
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Standard input is empty
stdout
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数列a5の和の値は-459
recの呼び出し回数は9
https://ideone.com/Nk3IRI
第５回課題２
language:
C (gcc 8.3)
created:
4 days ago
visibility:
public

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