Number guesser using function and midpoint [duplicate] - c++

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Number Gusser in c++ using function and midpoint
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I am writing a program for number guesser using function and midpoint to find out the number that been chosen. I have a problem compiling and I can't figure out the problem ????
The description of my problem:
The playOneGame function should have a return type of void. It should
implement a complete guessing game on the range of 1 to 100.
The shouldPlayAgain function should have a boolean return type. It
should prompt the user to determine if the user wants to play again,
read in a character, then return true if the character is a ‘y’, and
otherwise return false.
In addition, you should implement the helper functions
getUserResponseToGuess, and getMidpoint. They should be invoked inside
your playOneGame function.
getUserResponseToGuess. This function should prompt the user with the
phrase “is it ? (h/l/c): “ with the value replacing the token
. It should return a char. The char should be one of three
possible values: ‘h’, ‘l’, or ‘c’. It should have the following
signature: char getUserResponseToGuess(int guess)
getMidpoint. This function should accept two integers, and it should
return the midpoint of the two integers. If there are two values in
the middle of the range then you should consistently chose the smaller
of the two. It should have the following signature: int getMidpoint(int low, int high)
My code:
#include<iostream>
using namespace std;
void playOneGame;
char getUserResponseToGuess(int guess);
int getMidpoint ( int low, int high);
int main() {
do
{
playOneGame();
} while (shouldPlayAgain());
return 0;
}
void playOneGame
{
int a = 100;
cout << "\nGuess a number between 1 and 100. " <<endl;
getUserResponseToGuess ( a);
}
char getUserResponseToGuess(int guess)
{
while (true)
{
int guess = getMidpoint(minimum, maximum);
std::cout << "\nIs it [h]igher/[l]ower/[e]qual to " << guess << "? ";
char answer;
if (!(std::cin >> answer))
{
std::cerr << "error reading user input, program exiting\n";
exit(1);
}
if (answer == 'h')
minimum = guess + 1;
else if (answer == 'l')
maximum = guess - 1;
else if (answer == 'e')
{
std::cout << "Well, isn't that nice.\n";
return;
}
if (minimum > maximum)
{
std::cerr << "hey, you lied to me!\n";
exit(1);
}
}
}
int getMidpoint ( int low, int high)
{
int mid;
mid = (low + high) / 2;
return mid;
}

Answer 1

void playOneGame; is not a function forward declaration. void playOneGame(); is. Also the same applies for the function definition.
Also, you should define shouldPlayAgain() and include <stdlib.h> for exit() to work.
And getUserResponseToGuess() has just a return instead of returning something useful and it does not return anything on the default branch.