Help! Every time I compile it tells me "A function definition is nor allowed here before '{'"

[cpluspluschick]

The purpose of this program is to illustrate one use of void functions and reinforce use of value returning functions.

The program will function as a calculator; therefore, it is to invoke a void function (without parameters) to present the following menu for the user :

Welcome to the CIS 151 calculator

To make a selection, enter the number and press enter

1: Add 2 numbers

2: Subtract a number from another

3: Multiply 2 numbers

4: Divide 2 numbers

5. Modulus of 2 numbers

6. Raise a number to a power

7. Quit the program.

Then, based upon the user's choice, a value returning function with 3 parameters will called and a value will be returned to the mainline.

Next, a void function, with parameters will be called to output a message in one of the following formats :

The sum of a and b is c.

The difference between a and b is c.

The product of a and b is c.

a divided by b is c.

a modulus b is c.

a raised to the power of b is c.

Note : a and b will be input as double numbers. However, when processing option 5, store the numbers in integer variables and then calculate the modulus using the the integer variables.

// I can't do return functions so I'm lost.

#include <iostream>
#include <iomanip>
#include <string>
#include <cmath>
#include <cstdlib>


using namespace std;

int main(int argc, char** argv)
{
int choice;
double a, b;
double c;


int main()
{
int choice; //menu choice


//constants for menu choices
cout<< "Add two numbers" = 1,
cout<< "Subtract a number from another" = 2,
cout<< "Multiply two numbers" = 3,
cout<< "Divide two numbers" = 4,
cout<< "Modulus of two" = 5;
cout<< "Raise a number to a power"= 6;
cout<< "Quit the program"= 7
cin>> choice;

}

int choice (int a, int b, int c)
{
cout<< "Entertwo numbers"
cin>> a, b;
return main;
}


void answers (int& a, int& b, int c)
{
if (choice == 1)
c= a+b;
cout<< ""<< c<< endl;
if (choice == 2)
c= a-b;
cout<< ""<< c<< endl;
if (choice == 3)
c= a*b;
cout<< ""<< c<< endl;
if (choice == 4)
c= a/b;
cout<< ""<< c<< endl;
if (choice == 5)
c= a% b;
cout<< ""<< c<< endl;
if (choice == 6)
c= pow (a, b);
cout<< ""<< c<< endl;
if (choice == 7)
break;
}






return 0;
}
// I also can't do return functions so can someone please help me on how to do this?

[LB]

You are trying to define the main function inside the main function - why? Ctrl+F for "main" and you'll see what I mean.

return main; - this isn't how things work. Please see the functions tutorial on this website:
http://www.cplusplus.com/doc/tutorial/functions/

[cpluspluschick]

Thank you, i'll check it out. :) .. I'm new to C++ so it's not really easy for me.