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  1. #include <stdio.h>
  2. static int count=0;
  3. int funk(){
  4. 	count++;
  5. 	return count;
  6. }
  7. int rec(int n){
  8.  if(n==1){
  9.    	funk();
  10.    return 1;
  11.  } 
  12.  else if(n==2){
  13.  		funk();
  14.  	return 2;
  15.  }
  16.  else{	funk();
  17.  	return -6*rec(n-1)-9*rec(n-2);
  18.  
  19.  }
  20.  
  21. }
  22. int main(void) {
  23.   int n=5;
  24.   printf("数列a%dの値は%d\n", n,rec(n));
  25.  printf("このときrecの呼び出し回数は%d",count);
  26. 	return 0;
  27. }
  28.  
Success #stdin #stdout 0s 5320KB
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stdin
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Standard input is empty
stdout
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数列a5の値は-459
このときrecの呼び出し回数は9
https://ideone.com/79wtDm
language:
C (gcc 8.3)
created:
1 day ago
visibility:
public

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