함수 fibonacci()

함수 Fibonacci

1 C

/* http://stackoverflow.com/questions/2751458/fibonacci-function-question */

unsigned fibonacci(unsigned n, unsigned a, unsigned b, unsigned c) {
    return (n == 2) ? c : fibonacci(n - 1, b, c, b + c);
}

int fibonacci(int x) {
    if (x < 2) return 1;
    return Fibonacci(x-1) + Fibonacci(x-2);
}

2 PHP

/* http://stackoverflow.com/questions/15600041/php-fibonacci-sequence */

function fibonacci($n, $c = 2, $n2 = 0, $n1 = 1) {
    return $c < $n ? fibonacci($n, $c + 1, $n1, $n1 + $n2) : $n1 + $n2;
}

function fibonacci($n) {
    return $n < 3 ? 1 : fibonacci($n - 1) + fibonacci($n - 2);
}

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