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  1. #include <stdio.h>
  2.  
  3. // a{n+1} = -2a{n} + 4, a{0}=2 (再帰あり版)
  4. int rec(int n) {
  5.     if (n == 0) {
  6.         return 2;
  7.     } else {
  8.         return -2 * rec(n - 1) + 4;
  9.     }
  10. }
  11.  
  12. int main(void) {
  13.     int n = 4;
  14.     printf("数列a%dの値は%d\n", n, rec(n));
  15.     return 0;
  16. }
  17.  
  18.  
Success #stdin #stdout 0s 5312KB
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stdin
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5
stdout
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数列a4の値は12
https://ideone.com/RYbfkJ
language:
C (gcc 8.3)
created:
7 hours ago
visibility:
public

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