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  1. #include <stdio.h>
  2.  
  3. int main(void) {
  4.     int n = 4;
  5.     int a1 = 2, a2 = 3, a;
  6.  
  7.     for (int i = 3; i <= n; i++) {
  8.         a = 2*a2 + a1;
  9.         a1 = a2;
  10.         a2 = a;
  11.     }
  12.  
  13.     printf("数列a%dの値は%d\n", n, a);
  14.     return 0;
  15. }
  16.  
Success #stdin #stdout 0s 5320KB
comments (?)
stdin 
Standard input is empty
stdout 
数列a4の値は19
https://ideone.com/lYrqAL
language:
C (gcc 8.3)
created:
1 day ago
visibility:
public

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