I need help with this program

[Goinpostal1]

// Test12.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"
#include <iostream>
#include <cmath>
#include <iomanip>
using namespace std;
int x;
int y; 
char ch;

int main()
{
	int mystery (int x, double y, char ch);

	{

		if (x==0 && ch > 'A') 
			return (static_cast<int>(pow(y, 2)) + static_cast<int>(ch));
		else if (x > 0) 
			return (x + static_cast<int>(sqrt(y)) - static_cast<int>(ch));
		else 
			return (2*x + static_cast<int>(y) - static_cast<int>(ch)); 
	}
	return 0;
}

What is the output of the following C++ statements?
a. cout<< mystery(0, 6.5, 'K')<< endl;
b. cout<< mystery(4, 16.0, '#') << endl
c.cout << 2*mystery(-11, 13.8, '8')<< endl;

[AbstractionAnon]

What help do you need?

How are we supposed to know the output of mystery() ?
You have not supplied to code for it.

The function prototype for mystery() belongs before main().

PLEASE USE CODE TAGS (the <> formatting button) when posting code.
It makes it easier to read your code and also easier to respond to your post.
http://www.cplusplus.com/articles/jEywvCM9/
Hint: You can edit your post, highlight your code and press the <> formatting button.

[booradley60]

Declare "mystery" outside of main. Put those statements that you're curious about inside of main. Run the program.

// Test12.cpp : Defines the entry point for the console application.
#include <iostream>
#include <cmath>
#include <iomanip>
using namespace std;
int x;
int y;
char ch;

int mystery (int x, double y, char ch)
{
    if (x==0 && ch > 'A')
        return (static_cast<int>(pow(y, 2)) + static_cast<int>(ch));
    else if (x > 0)
        return (x + static_cast<int>(sqrt(y)) - static_cast<int>(ch));
    else
        return (2*x + static_cast<int>(y) - static_cast<int>(ch));
}

int main()
{
    cout << mystery(0, 6.5, 'K') << endl;
    cout << mystery(4, 16.0, '#') << endl;
    cout << 2*mystery(-11, 13.8, '8')<< endl;
    return 0;
}

[Goinpostal1]

I declared mystery but, pow and sqrt was considered an error
and it came up as more than one instance of overloaded function "pow" matches the argument list.