尝试在c++的斐波那契循环中获得比输入数字更小的斐波那契数

#include <iostream>

int getSmallerFibonacci(int num) {
    int a = 0;
    int b = 1;
    int c = a + b;

    while (c <= num) {
        c = a + b;
        a = b;
        b = c;
    }

    return a;
}

int main() {
    int inputNum;
    std::cout << "请输入一个数字：";
    std::cin >> inputNum;

    int result = getSmallerFibonacci(inputNum);
    std::cout << "比输入数字更小的斐波那契数是：" << result << std::endl;

    return 0;
}