LNK1120+2019 in example from C++ Through Game Programming

[かあびぃ]

It's odd. I get 2 fatal errors(LNK1120, and LNK2019) when trying to build a direct example taken straight from the book. Any ideas?

 

 

        

// Game Stats
// Demonstrates declaring and initializing variables

#include <iostream>
using namespace std;

int main()
{
    int score;                
    double distance;        
    char playAgain;            
    bool shieldsUp;            

    short lives, aliensKilled;

    score = 0;
    distance = 1200.76;
    playAgain = 'y';
    shieldsUp = true;
    lives = 3;
    aliensKilled = 10;
        
    double engineTemp = 6572.89;

    cout << "\nscore: "        << score << endl;
    cout << "distance: "    << distance << endl;
    cout << "playAgain: "    << playAgain << endl;
    //skipping shieldsUp since you don't generally print Boolean values
    cout << "lives: "        << lives << endl;
    cout << "aliensKilled: "<< aliensKilled << endl;
    cout << "engineTemp: "    << engineTemp << endl;

    int fuel;
    cout << "\nHow much fuel? ";
    cin >> fuel;
    cout << "fuel: " << fuel << endl;

    typedef unsigned short int ushort;
    ushort bonus = 10;
    cout << "\nbonus: " << bonus << endl;

    return 0;
}
 

[DXMember]

6 minutes ago, かあびぃ said:

using namespace std;

remove this line from your code.

and make sure "main" is set to be entry point in the compiler, linker settings when building the project

[かあびぃ]

2 minutes ago, DXMember said:

remove this line from your code.

Unfortunately i get the same errors 

[Unimportant]

Those are linker errors (unresolved externals), so the program compiled fine, the linker just can't find some external symbols. Could you paste the full error lines given, they should include information about the missing symbol names.

[かあびぃ]

1 minute ago, Unimportant said:

Those are linker errors (unresolved externals), so the program compiled fine, the linker just can't find some external symbols. Could you paste the full error lines given, they should include information about the missing symbol names.

Sure

Error LNK2019    unresolved external symbol _main referenced in function "int __cdecl invoke_main(void)" (?invoke_main@@YAHXZ)

[Unimportant]

For some reason the linker can't find your 'main' function. It's however clearly present in the code (which compiles and runs fine for me, with g++). So there must be something wrong with your project configuration. Are you sure the project is set to win32 console application ? And Linker -> System -> SubSystem should be Windows.

[かあびぃ]

1 minute ago, Unimportant said:

For some reason the linker can't find your 'main' function. It's however clearly present in the code (which compiles and runs fine for me, with g++). So there must be something wrong with your project configuration. Are you sure the project is set to win32 console application ? And Linker -> System -> SubSystem should be Windows.

It is a win32 console, but not sure about the linker settings, how do i set those?

[Unimportant]

Right click on the project you're working on (not the solution), select properties and in the menu that pops up there should be a submenu for linker settings.

 

[かあびぃ]

4 minutes ago, Unimportant said:

Right click on the project you're working on (not the solution), select properties and in the menu that pops up there should be a submenu for linker settings.

 

Subsystem says: Console(/SUBSYSTEM:CONSOLE)

[Unimportant]

Can't really help you further then. The code is OK. It's a project setting somewhere. Maybe start with a fresh project and try again.