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  1. #include <stdio.h>
  2.  
  3. int fib1(int n) {
  4.     if (n == 0) return 0;
  5.     if (n == 1) return 1;
  6.  
  7.     int a = 0, b = 1, temp;
  8.     for (int i = 2; i <= n; i++) {
  9.         temp = a + b;
  10.         a = b;
  11.         b = temp;
  12.     }
  13.     return b;
  14. }
  15.  
  16. int main() {
  17.     int n;
  18.     scanf("%d", &n);
  19.  
  20.     if (n < 0) {
  21.         return 1;
  22.     }
  23.  
  24.     printf("%d\n", fib1(n));
  25.     return 0;
  26. }
Success #stdin #stdout 0s 5308KB
comments (?)
stdin 
4
stdout 
3
https://ideone.com/XvwjNg
language:
C (gcc 8.3)
created:
15 days ago
visibility:
public

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