我是C++的完整入门者。我正在尝试调试代码,因为我确定存在一些指针错误,因此我仍在尝试理解但无法编译它。该代码最初来自我编写的Java程序,它只是一个带有一些比较方法的歌曲类,我已将其转录为c++以尝试学习两种语言之间的差异,该代码本身未显示任何错误,但无法显示编译时不会 pop 该错误。我尝试查看该错误的解决方案,但没有任何效果,因此这是我的win32控制台项目代码。感谢您的帮助。
// ConsoleApplication4.cpp : Defines the entry point for the console application.
//
#include "stdafx.h"
#include <string>
#include <iostream>
using namespace std;
class Song {
private:
string Artist;
string Title;
string Lyrics;
public:
static int Sortcount;
static int Searchcount;
Song(string A_Artist, string T_Title, string L_Lyrics) {
Artist = A_Artist;
Title = T_Title;
Lyrics = L_Lyrics;
}
//Compares the artist of one song to another.
class ArtistComparator {
public:
int compare(Song *o1, Song *o2) {
string Artist1 = (*o1).Artist;
string Artist2 = (*o2).Artist;
Searchcount++;
if (Artist1.compare(Artist2) == 0){
return 0;
}
Searchcount++;
return (*o1).Artist.compare((*o2).Artist);
}
};
//Compares the title of one song to another.
class TitleComparator {
public:
int compare(Song arg0, Song arg1) {
string Title1 = arg0.Title;
string Title2 = arg1.Title;
return Title1.compare(Title2);
}
};
public:
//Testing method to make sure the Song class works and
//the compareTo method works.
int main(int argc, char** argv){
Song test1 = Song("cat", "bat", "this is not a real song");
Song test2 = Song("cat", "apple", "also not a real song");
int compareResult = test1.compareTo(test2);
if (compareResult == -1){
std::cout << "test1 comes first";
}
else{
cout << "test2 comes first";
cout << test2.toString();
}
};
string getArtist(){
return Artist;
};
string getTitle(){
return Title;
};
string getLyrics(){
return Lyrics;
};
string toString(){
return Artist + ", " + Title + ", " + Lyrics;
};
//compareTo method used for sorting songs.
//increments Sortcount each time it is called to keep track
//of the efficiency of the sort algorithm.
private:
int compareTo(Song other){
Sortcount++;
int art = Artist.compare(other.Artist);
if (art == 0){
return Title.compare(other.Title);
}
else
return art;
}
};
最佳答案
#include "stdafx.h"
#include <string>
#include <iostream>
using namespace std;
class Song {
private:
string Artist;
string Title;
string Lyrics;
public:
int Sortcount;
static int Searchcount;
Song(string A_Artist, string T_Title, string L_Lyrics) {
Artist = A_Artist;
Title = T_Title;
Lyrics = L_Lyrics;
}
//Compares the artist of one song to another.
class ArtistComparator {
public:
int compare(Song *o1, Song *o2) {
string Artist1 = (*o1).Artist;
string Artist2 = (*o2).Artist;
Searchcount++;
if (Artist1.compare(Artist2) == 0){
return 0;
}
Searchcount++;
return (*o1).Artist.compare((*o2).Artist);
}
};
//Compares the title of one song to another.
class TitleComparator {
public:
int compare(Song arg0, Song arg1) {
string Title1 = arg0.Title;
string Title2 = arg1.Title;
return Title1.compare(Title2);
}
};
public:
//Testing method to make sure the Song class works and
//the compareTo method works.
string getArtist(){
return Artist;
};
string getTitle(){
return Title;
};
string getLyrics(){
return Lyrics;
};
string toString(){
return Artist + ", " + Title + ", " + Lyrics;
};
//compareTo method used for sorting songs.
//increments Sortcount each time it is called to keep track
//of the efficiency of the sort algorithm.
int compareTo(Song other){
Sortcount++;
int art = Artist.compare(other.Artist);
if (art == 0){
return Title.compare(other.Title);
}
else
return art;
}
};
int main(int argc, char** argv){
Song test1 = Song("cat", "bat", "this is not a real song");
Song test2 = Song("cat", "apple", "also not a real song");
int compareResult = test1.compareTo(test2);
if (compareResult == -1){
std::cout << "test1 comes first";
}
else{
cout << "test2 comes first";
cout << test2.toString();
}
getchar();
return 0;
}
完成的更改:
main()
移到compareTo()
函数public
直接被称为static
中删除了int Sortcount
,因为如果没有它我将无法更新变量。 关于c++ - C++错误LNK2019 : unresolved external symbol _main referenced in function _tmainCRTStartup,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/29385910/