C++：输出原始输入而不是修改后的输入

Question

//units

#include <iostream>
#include <string>
#include <vector>
#include <algorithm>
#include <cmath>

int main()
{
    double cm;
    double m = 100.0;
    double in = 2.54;
    double ft = 30;

    std::vector<double> numbers;

    std::cout << "Please enter two doubles with their units (cm, m, in, ft): ";
    double input = 0;
    std::string unit = "";
    while(std::cin >> input >> unit)
    {
        if (unit == "m")
        {
            double inputInCm = input*m;
            numbers.push_back(inputInCm);
        }
        else if (unit == "ft")
        {
            double inputInFt = input*m;
            numbers.push_back(inputInFt);
        }
        else if (unit == "in")
        {
            input *= in;
            numbers.push_back(input);
        }
        else if (unit == "cm")
        {
            numbers.push_back(input);
        }
        else
            std::cout << "This is not a valid unit/you did not enter a unit!\n";
    }

    sort(numbers.begin(), numbers.end());

    if(numbers[0] == numbers[1])
        std::cout << "These numbers are equal.\n";
    else if(numbers[1] - numbers[0] < 1.0/100)
        std::cout << "Thesee numbers are almost equal.\n";
    else
        std::cout << "The smaller value is: " << numbers[0] << ".\n"
            << "The bigger value is: " << numbers[1] << ".\n";
}

这个程序收集两个数字然后返回哪个值更大。但是，关于单位，当我将它们收集到一个向量中时，它会将它们的值更改为“cm”，以便我可以比较它们的大小。最后，当我打印“最小值是：”时，它返回修改后的值。如何改为打印原始值？谢谢