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  1. #include <stdio.h>
  2.  
  3. int fib(int n) {
  4.     int i;
  5.     int a_1 = 1, a_2 = 1, a_3;
  6.     if((n==1)||(n==2))
  7.     return 1;
  8.     for(i=3;i<n;i++){
  9.     	a_3=a_1+a_2;
  10.     	a_1=a_2;
  11.     	a_2=a_3;
  12.     }
  13.  
  14.     return a_2;
  15. }
  16.  
  17. int main(void) {
  18.     int n;
  19.  
  20.     scanf("%d", &n);
  21.     printf("第 %d 項の値：%d\n", n, fib(n));
  22.     return 0;
  23. }
Success #stdin #stdout 0.01s 5276KB
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5
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第 5 項の値：3
https://ideone.com/TOZG7L
language:
C (gcc 8.3)
created:
46 days ago
visibility:
public

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