我輸入了這段代碼，當我點擊構建時，它給了我這個錯誤？

-2

錯誤是： 1> MSVCRTD.LIB（crtexew.obj）：錯誤LNK2019：解析外部符號的WinMain @函數引用_ _tmainCRTStartup ，它是給我這個錯誤太致命錯誤LNK1120 16：1個無法解析的外部我輸入了這段代碼，當我點擊構建時，它給了我這個錯誤？

#include <iostream> 
#include <fstream> 
#include <string> 
using namespace std; 
struct student 
{ 
    string name; 
string department; 
double first; 
double second; 
}; 
class CS112Section 
{ 
student stu[30]; 
int numOfStudent; 
public: 
CS112Section(); 
~CS112Section(); 
void printSection(); 
void insert(student student); 
int getNumOfStudent(); 
string MaxFirstAndSecond(); 
void Average(double&, double&); 
bool isFull(); 
bool isEmpty(); 
void AddBounsFirst(int); 
}; 
void main() 
{ 
CS112Section section; 
char choice; 
bool finish = true; 
while (finish != false) 
{ 
    cout << "1-Insert Info From .Txt file.\n2-Insert Student  Manually.\n3-Show The Number Of Student In The Class.\n"; 
    cout << "4-Print The Content Of The Section.\n5-The Student With The Full Marks First And Second.\n6-Show If"; 
    cout << " The Class Full Or Not.\n7-Print The Average Of The First And The Second.\n8-Do You Want To Add Bouns ?\n"; 
    cout << "9-Exit."; 
    cin >> choice; 
    switch (choice) 
    { 
    case 1: 
    case 2: 
    case 3: 
     cout << "The Number Of Student In The Section : " << section.getNumOfStudent(); 
    case 4: 
     section.printSection(); 
    case 5: 
     section.MaxFirstAndSecond(); 
    case 6: 
     if (section.isEmpty() == 1) 
      cout << "The Class Is Empty\n"; 
     else if (section.isFull() == 1) 
      cout << "The Class Is Full"; 
    case 7: 
     double avF, avS; 
     section.Average(avF, avS); 
     cout << "The Average Of The First Is : " << avF; 
     cout << "\nThe Average Of The Section Is : " << avS << endl; 
    case 8: 
     int x; 
     cout << "How Many Marks Do You Want To Add ?"; 
     cin >> x; 
     section.AddBounsFirst(x); 
    case 9: 
     finish = false; 
    } 
} 
} 
CS112Section::CS112Section(){ numOfStudent = 0; } 
CS112Section::~CS112Section(){ cout << "Good Luck In Your Final ^_^"; } 
void CS112Section::printSection() 
{ 
cout << "the Number Of Student In The Section is : "<<numOfStudent; 
cout << "---------------------------------------------"; 
cout << "Name\tFirst\tSecond\tDepartment\n"; 
for (int i = 0; i < 30; i++) 
    cout << stu[i].name << "\t" << stu[i].first << "\t" << stu[i].second << "\t"<<stu[i].department << "\n"; 
} 
void CS112Section::insert(student student) 
{ 
for (int i = 0; i < 30;i++) 
if (stu[i].name.empty() == 1 && stu[i].first == stu[i].department.npos&&stu[i].second == stu[i].department.npos&&stu[i].department.empty() == 1) 
    stu[i] = student; 
} 
int CS112Section::getNumOfStudent() 
{ 
return numOfStudent; 
} 
string CS112Section::MaxFirstAndSecond() 
{ 
for (int i = 0; i < 30; i++) 
if (stu[i].first == 30 && stu[i].second == 30) 
    return stu[i].name; 
} 
void CS112Section::Average(double&avF, double&avS) 
{ 
double sumF = 0, sumS = 0; 
for (int i = 0; i < 30; i++) 
    { 
     sumF += stu[i].first; 
     sumS += stu[i].second; 
    } 
for (int i = 0; i < 30; i++) 
{ 

    if (stu[i].first == stu[i].department.npos) 
     sumF = 0; 
    if (stu[i].second == stu[i].department.npos) 
     sumS = 0; 
} 
avF = sumF/30; 
avS = sumS/30; 
} 
bool CS112Section::isFull() 
{ 
if (numOfStudent == 30) 
    return 1; 
return 0; 
} 
bool CS112Section::isEmpty() 
{ 
if (numOfStudent == 0) 
    return 1; 
return 0; 
} 
void CS112Section::AddBounsFirst(int Bouns) 
{ 
for (int i = 0; i < 30; i++) 
    stu[i].first += 1; 
}

來源

2014-03-31 Khaled Odat

可能重複的[什麼是未定義的引用/無法解析的外部符號錯誤，以及如何解決它？]（http://stackoverflow.com/questions/12573816/what-is-an-undefined-reference-unresolved- external-symbol-error-and-how-do-i-fix） –

在發佈之前請先搜索。 –

@LightnessRacesinOrbit我認爲這個問題比通用的問題更具體一些。 –

在這種情況下，它看起來像你使用Visual Studio創建，你打算創建一個控制檯應用程序，而不是一個Windows應用程序。請參閱WinMain entry point - 使用WinMain代替Windows項目的main。

要修復它，您需要重新創建項目，選擇適當的類型。

來源

2014-03-31 18:06:06

我輸入了這段代碼，當我點擊構建時，它給了我這個錯誤？

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