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POunresolved externals Error in C++ Project
 

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  1. POunresolved externals Error in C++ Project
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    <p>I wrote my project using a simple editor and I compile them by using Microsoft vc++ compiler through command line interface, I am getting the following error:</p> <pre><code>/out:Main.exe Main.obj </code></pre> <blockquote> <p>Main.obj : error LNK2019: unresolved external symbol "public: void __thiscall Ac count::debit(int)" (?debit@Account@@QAEXH@Z) referenced in function _main</p> <p>Main.obj : error LNK2019: unresolved external symbol "public: int __thiscall Acc ount::getBalance(void)" (?getBalance@Account@@QAEHXZ) referenced in function _main</p> <p>Main.obj : error LNK2019: unresolved external symbol "public: __thiscall Account ::Account(int)" (??0Account@@QAE@H@Z) referenced in function _main Main.exe : fatal error LNK1120: 3 unresolved externals</p> </blockquote> <p>Here is the code:</p> <pre><code>//File : Account.h class Account{ public: Account( int ); void credit( int ); void debit( int ); int getBalance(); private: int balance; }; </code></pre> <pre><code>//File:Account.cpp #include&lt;iostream&gt; using std::cout; using std::endl; #include "Account.h" Account::Account( int initialbalance ){ balance = 0; if( initialbalance &gt; 0 ) balance = initialbalance; if ( initialbalance &lt; 0 ) cout&lt;&lt;"Initial Balance is empty\n"&lt;&lt;endl; } void Account::credit( int amount ){ balance = balance + amount; } void Account::debit( int amount ){ if( amount &lt;= balance ) balance = balance - amount; else cout&lt;&lt;"Debit amount exceed balance amount\n"&lt;&lt;endl; } int Account::getBalance(){ return balance; } </code></pre> <pre><code>//File : Main.cpp #include&lt;iostream&gt; using std::cout; using std::endl; using std::cin; #include "Account.h" int main(){ Account obj(50); cout&lt;&lt;"Account balance Rs. "&lt;&lt;obj.getBalance()&lt;&lt;"\n"&lt;&lt;endl; int withdraw; cout&lt;&lt;"Withdrawal amount for your account\n"&lt;&lt;endl; cin&gt;&gt;withdraw; cout&lt;&lt;"Withdrawing ....."&lt;&lt;endl; obj.debit( withdraw ); cout&lt;&lt;"Final account balance : "&lt;&lt;obj.getBalance()&lt;&lt;endl; return 0; } </code></pre> <p>I have first compiled Account.cpp by using "cl /LD Account.cpp" , then when i try to compile "Main.cpp" I get these error , to be specific I want to know how to use a compiled .dll or .obj file in my client code that uses these compiled files when their source code is not available .</p> <p>Thanks in advance.</p>
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    1. COI actually never compiler with the command line in VC++, but you would have to include the account.h/cpp into the compilation. from what I see you're only compiling the main.cpp, and that's not compiling and linking automatically account.cpp
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      1. USMarius Bancila
 

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