c++ - Mach-O error when trying to compile in Xcode -

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i'm working on c++ program in xcode, , keep getting mach-o error when try build , run app (plus "build failed" error message). below code i'm using:

// //  quadsolver.cpp //  calculator // // #include <iostream> #include <cstdio> #include <cstdlib> #include <cmath> using namespace std;  int main(int nnumberofargs, char* pszargs[]) {     //enter 3 variables     double a;     double b;     double c;     cout << "enter a";     cin >> a;      cout << "enter b";     cin >> b;      cout << "enter c";     cin >> c;      //calculating discriminant     double d;     d = b * b - 4 * * c;     double x1, x2;      if (d == 0)     {         x1 = x2 = -b / (2 * a);         cout << "there's 1 solution: ";         cout << x1;         system("pause");         return 0;     }      else if (d < 0)     {         cout << "there no possible solutions, discriminant smaller zero";         system("pause");         return 0;     }     else if (d > 0)     {         x1 = (-b - sqrt(d)) / (2 * a);         x2 = (-b + sqrt(d)) / (2 * a);         cout << "there 2 solutions:";         cout << "x1=";         cout << x1;         cout << "x2=";         cout << x2;     } }

and error message along lines of:

ld: duplicate symbol _main in /users/myusername/library/developer/xcode/deriveddata/calculator-cwpaasypxtqkpvfsbfjekrgrgvbq/build/intermediates/calculator.build/debug/calculator.build/objects-normal/x86_64/quadsolver.o , /users/myusername/library/developer/xcode/deriveddata/calculator-cwpaasypxtqkpvfsbfjekrgrgvbq/build/intermediates/calculator.build/debug/calculator.build/objects-normal/x86_64/main.o architecture x86_64

your main function defined in 2 places. in little program there , in source file named main, came part of template. i'm not sure template used, in project file named main , remove or comment out implementation of main function.


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