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  1. #include <stdio.h>
  2.  
  3. int main(void) {
  4.     int n = 4;
  5.     int a, b = 3, c = 2;
  6.  
  7.     for (int i = 3; i <= n; i++) {
  8.         a = 2 * b + c;
  9.         c = b;
  10.         b = a;
  11.     }
  12.  
  13.     printf("数列の%dの値は%d\n", n, a);
  14.  
  15.     return 0;
  16. }
  17.  
  18.  
Success #stdin #stdout 0s 5316KB
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Standard input is empty
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数列の4の値は19
https://ideone.com/N2WiLS
language:
C (gcc 8.3)
created:
10 days ago
visibility:
public

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