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25 lines
627 B
C++
25 lines
627 B
C++
#include <cassert>
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#include <iostream>
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/* Calculate the the value on Fibonacci's sequence given an
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integer as input
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Fibonacci = 0, 1, 1, 2, 3, 5,
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8, 13, 21, 34, 55,
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89, 144, ... */
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int fibonacci(unsigned int n) {
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/* If the input is 0 or 1 just return the same
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This will set the first 2 values of the sequence */
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if (n <= 1) return n;
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/* Add the last 2 values of the sequence to get next */
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return fibonacci(n - 1) + fibonacci(n - 2);
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}
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int main() {
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int n;
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std::cin >> n;
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assert(n >= 0);
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std::cout << "F(" << n << ")= " << fibonacci(n) << std::endl;
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}
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