Need help finding error

I am new to C++ and am working on an assignment for my class...

The error i am getting is the following:

Code:

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c:\documents and settings\matt\my documents\visual studio 2005\projects\assignment 1a\assignment 1a\assignment 1b.cpp(8) : error C2668: 'atan' : ambiguous call to overloaded function
1>        c:\program files\microsoft visual studio 8\vc\include\math.h(545): could be 'long double atan(long double)'
1>        c:\program files\microsoft visual studio 8\vc\include\math.h(497): or 'float atan(float)'
1>        c:\program files\microsoft visual studio 8\vc\include\math.h(109): or 'double atan(double)'
1>        while trying to match the argument list '(int)'

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The program:

Code:

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#include <iostream>
#include <string>
#include <cmath>
using namespace std;

int main (void)
{
        const double PI = 4*atan(1); //the constant Pi
        double d; //diameter
        double r; //radius
        double area; //area
        string name;  //your name
       
        cout << "What is your name?" << endl;
        cin >> name;

        cout << "Enter the diameter of a circle:" << endl;
        cin >> d;

        r = 1/2 *d;
        area = PI * r * r;

        cout << "Hi " << name << ", the area of a circle with a diameter of "
                << d << "is" << area << endl;

        return 0;
}

---

its probably something very intuitive for someone who has some experience but please help me out

thanks in advance!

hi i think u might need to put this

Code:

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const double PI = 4*atan(1.0);

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also if u put this u can see what happens

Code:

---

cout << "Hi " << name << ", the area of a circle with a diameter of "
                << d << "is" << area << endl;
                system("pause");
        return 0;
}

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Code:

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const double PI = 4*atan(1.0);

---

Just tried it...

I get this

fatal error LNK1169: one or more multiply defined symbols found

Code:

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cout << "Hi " << name << ", the area of a circle with a diameter of "
                << d << "is" << area << endl;
                system("pause");
        return 0;

---

Doesnt help either

im running devcpp
and as the code is written it worked fine with me so i guess its time
for someone who knows what they doing to look at it sorry i cant be more help
:(
when u wrote the code in did u add a new line or did u change what u had already?

what is devcpp? Is that the compiler u are using?

yep :)

I am using Visual C++ from microsoft if that has anything to do with it.

ok im not very good at this myself but it sounds like u defined something twice?
check your code to make sure any functions i.e main or variables are only defined once

would it make a difference if i have another source file in the same program with that also has a variable named "name:?

if u post all the source code ill see if i can fix it i do think that another name: in a source file will make an error if they are both in scope of each other

ok. here is the other source File

Code:

---

#include <iostream>
#include <string>
using namespace std;

int main(void)

{
        string name;
        int age;

        cout << "What's your name? " << endl;
        cin >> name;

        cout << "How old are you?" << endl;
        cin >> age;

        cout << "Hello "<< name
                << ", you will be " << age+1
                << " years old on your next birthday." << endl;

        return (0);
}

---

and here is the second source file

Code:

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#include <iostream>
#include <string>
#include <cmath>

using namespace std;

int main (void)
{
        const double PI = 4*atan(1.0);  //the constant Pi
        double d; //diameter
        double r; //radius
        double area; //area
        string n;  //your name
       
        cout << "What is your name?" << endl;
        cin >> n;

        cout << "Enter the diameter of a circle:" << endl;
        cin >> d;

        r = 1/2 *d;
        area = PI * r * r;

        cout << "Hi " << n << ", the area of a circle with a diameter of "
                << d << "is" << area << endl;
     
        return 0;
}

---

I am not sure what you mean by " in scope of each other".

Oh i figured it out!!

It didnt like that i had

Code:

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int main (void);

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in the two source files!

Thanks for your help anyways!

ok i think the problem is u have 2

Code:

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int main ()

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have u got these in a project file?

i mean if a variable is global then u can only have that name once
but if it is local to a function then u can have 2

{

lol well done an experienced c++ user would of spotted that straight away lol
sorry to of hinderd ya :( :)