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  1. #include <stdio.h>
  2.  
  3. int b(int n) {
  4.     if (n == 0) return 5;
  5.     return b(n - 1) + 6;
  6. }
  7.  
  8. int a(int n) {
  9.     if (n == 0) return 2;
  10.     if (n == 1) return 7;
  11.     return a(n - 1) + b(n - 1);
  12. }
  13.  
  14. int main(void) {
  15.     int n;
  16.  
  17.     printf("a_n を求めるための n を入力してください: ");
  18.     scanf("%d", &n);
  19.  
  20.     printf("a_%d = %d\n", n, a(n));
  21.  
  22.     return 0;
  23. }
  24.  
Success #stdin #stdout 0s 5316KB
comments (?)
stdin 
4
stdout 
a_n を求めるための n を入力してください: a_4 = 58
https://ideone.com/QfSKBK
language:
C (gcc 8.3)
created:
3 days ago
visibility:
public

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