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  1. #include <stdio.h>
  2. //a{n+1} = -2a{n} + 4, a{0}=2(再帰あり版)
  3. int rec(int n) {
  4.     if (n == 0) {
  5.         return 2;
  6.     } else {
  7.         return -2 * rec(n - 1) + 4;
  8.     }
  9. }
  10.  
  11. int main(void) {
  12.     int n = 4;
  13.     printf("数列a%dの値は%d\n", n, rec(n));
  14.     return 0;
  15. }
  16.  
Success #stdin #stdout 0s 5324KB
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数列a4の値は12
https://ideone.com/QfWiAP
language:
C (gcc 8.3)
created:
7 hours ago
visibility:
public

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