c++ - 在不使用数组的情况下从已知变量列表中查找最大值

Question

#include<iostream>
#include<string>
#include<ctime>
using namespace std;

int main()
{
int box1 = 30;
int box2 = 99;
int box3 = 140;
int box4 = 200;
int box5 = 220;
int box6 = 260;
int box7 = 300;
int box8 = 310;
int box9 = 500;
int box10 = 100;

return(0);
}

我试过类似的方法:

string var;
int i = 1;

for(i=1;i<=10;i++) {
var = "box" + std::to_string(i);
cout << var << endl;
}

但它一直告诉我 std::to_string 是对重载函数的模棱两可的调用。不确定从这里去哪里。

Answer 1

既然你问了*(proof that it works，preprocessed (scroll down for output)):

#include <algorithm>
#include <iostream>

#include <boost/preprocessor.hpp>

#define VAR_N(z, n, nameBase) BOOST_PP_CAT(nameBase, BOOST_PP_INC(n))

int main() {
    int box1 = 30;
    int box2 = 99;
    int box3 = 140;
    int box4 = 200;
    int box5 = 220;
    int box6 = 260;
    int box7 = 300;
    int box8 = 310;
    int box9 = 500;
    int box10 = 100;

    std::cout << std::max({BOOST_PP_ENUM(10, VAR_N, box)}); //500
}

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*说真的，没有十个变量的名称只是连续数字不同。这就是数组的用途。