Question

我正在开设一个计算机科学课程。我编写代码并使用MinGW测试它，它工作正常。然后我将代码复制到大学的Linux服务器上并在那里进行了测试，因为那是我教授评分的分配。输出非常不同 - 就像它在输出中间打印出一个回车。

有趣的是，在使用Cygwin GCC（32位，4.7.2）编译和运行时也会出现问题。有没有人知道为什么会发生这种情况以及如何解决这个问题？

Code和sample input file（将命名为lifepath.txt并放在与可执行文件相同的目录中）。

#include <iostream>
#include <fstream>
#include <map>
#include <set>
#include <string>
#include <cstdlib>

using namespace std;

bool younger(string s1, string s2) {
    string y1 = s1.substr(s1.rfind('-')+1);
    string y2 = s2.substr(s2.rfind('-')+1);

    if(y1 < y2) return true;
    else if(y1 > y2) return false;

    string m1 = s1.substr(s1.find('-')+1, s1.rfind('-')-s1.find('-')-1);
    string m2 = s2.substr(s2.find('-')+1, s2.rfind('-')-s2.find('-')-1);

    if(m1 < m2) return true;
    else if(m1 > m2) return false;

    string d1 = s1.substr(0, s1.find('-'));
    string d2 = s2.substr(0, s2.find('-'));

    return d1 < d2;
}

int main() {
    ifstream in("lifepath.txt");
    map<int, int> pathcounts;
    set<string> bdays;
    string oldest, youngest;

    map<string, int> years;

    string line;
    while(getline(in, line)) {
        string monthday = line.substr(0, line.rfind('-'));
        bdays.insert(monthday);
        string num = line;
        while(num.find('-') != string::npos) num.erase(num.find('-'));
        int path = atoi(num.c_str()) % 9 + 1;
        pathcounts[path]++;

        if(youngest == "" || younger(line, youngest)) youngest = line;
        if(oldest == "" || younger(oldest, line)) oldest = line;

        years[line.substr(line.rfind('-')+1)]++;

    }

    for(int i = 1; i <= 9; i++) {
        cout << i << ": " << pathcounts[i] << endl;
    }

    cout << endl;

    cout << "The oldest birthday is " << oldest << endl;
    cout << "The youngest birthday is " << youngest << endl;

    cout << endl;

    cout << "There are " << bdays.size() << " unique birthdays" << endl;

    cout << endl;

    string modeyear = "";
    int modeyearcount = 0;
    for(map<string, int>::iterator it = years.begin(); it != years.end(); it++) {
        if(it->second > modeyearcount) {
            modeyear = it->first;
            modeyearcount = it->second;
        }
        else if(it->second == modeyearcount) modeyear += " " + it->first;
    }

    cout << "The mode of the birthyears is " << modeyear;
    cout << ", appearing " << modeyearcount << " times" << endl;


    return 0;
}

我会发布一个链接到输出图像作为回复，因为我没有足够的代表在帖子中有两个以上的链接。

Answer 1

这是因为Windows中的不同行结尾\r意味着只是从文件中读取数据并设置年份数组时才转到行的开头。您使用的是密钥，而不仅仅是####，而是####\r，最后一个符号会在cout期间显示。

所以你需要改变你的代码：

years[line.substr(line.rfind('-')+1, 4)]++;

GCC和MinGW之间奇怪的输出差异（C ++）

1 个答案: