Please help

[Mesmaroth]

I am just learning and hoping to get better and begin my career once I master this. I can not go to any of the functions?? It does nothing. Am I calling them right?

#include "stdafx.h"
#include <iostream>
char cal();
char AI();

int main()          
{
	char exit;
	int user_choice;
	std:: cout << "Hello!\nPlease choose one of the following.\n\n";
	std:: cout << "Press the number 1 for \n";
	std:: cout << "The Calculator: solves mathematical problems inputing two numbers.\n\n";

	std:: cout << "Press the number 2 for \n";
	std:: cout << "Age identifier: Tells how old are you.\n\n";
	
	std:: cin >> user_choice;
	if (user_choice >= 3)
	{
		std:: cout << "Oops!\n Please pick one of the options above.\n";
	}
	switch (user_choice)
	{
		case 1: (user_choice==1);
				{
					char cal();
					break;
				}
		case 2: (user_choice==2);
				{
					char AI();
					break;
				}
	}
	return 0;
	}
char cal()
{
	char choice ='y';
	do{
	int user_problem;	
	std:: cout << "You have selected the calculator.\n";
	std:: cout << "Press 1 for addition.\n";
	std:: cout << "Press 2 for subtraction.\n";
	std:: cout << "Press 3 for multiplication.\n";
	std:: cout << "Press 4 for division.\n";
	if (user_problem >= 5)
	{
		std:: cout << "Whoops! Please pick the right problem.\n";
	}

	switch (user_problem)
	{
	case 1: (user_problem == 1);
			{
				int user_num1;
				int user_num2;
				std:: cout << "Choose the first number.\n";
				std:: cin >> user_num1;
				std:: cout << "Choose the second number,\n";
				std:: cin >> user_num2;
				std:: cout << user_num1 <<'+' << user_num2 << '=' << user_num1+user_num2 << std:: endl;
				break;
			}

	case 2: (user_problem == 2);
			{
				int user_num1;
				int user_num2;
				std:: cout << "Choose the first number.\n";
				std:: cin >> user_num1;
				std:: cout << "Choose the second number.\n";
				std:: cin >> user_num2;
				std:: cout << user_num1 << '-' << user_num2 << '=' << user_num1-user_num2 << std:: endl;
				break;
			}

	case 3: (user_problem == 3);
			{
				int user_num1;
				int user_num2;
				std:: cout << "Choose the first number. \n";
				std:: cin >> user_num1;
				std:: cout << "Choose the second. \n";
				std:: cin >> user_num2;
				std:: cout << user_num1 << '*' << user_num2 << '=' << user_num1*user_num2 << std:: endl;
				break;
			}

	case 4: (user_problem == 4);
			{
				float user_num1;
				float user_num2;
				std:: cout << "Choose the first number.\n";
				std:: cin >> user_num1;
				std:: cout << "Choose the second number.\n";
				std:: cin >> user_num2;
				std:: cout << user_num1 << '*' << user_num2 << '=' << user_num1*user_num2 << std:: endl;
				break;
			}
	}

	std:: cout << "Would you like to restart the calculator? Press y to restart.\n Otherwise press any other key to return to the main menu.";
	std:: cin >> choice;
	if (choice == 'y')
		system ("cls");
	}
	while (choice == 'y');
	system ("cls");
	std:: cout << "You have chose to exit. Press any key to exit.\n";
	char x;
	std:: cin >> x;
	return main();
}

char AI()
{
	char choice = 'y';
	do{
		int user_ybirth;
		std:: cout << "You have chosen Bithday Identifier.\n";
		std:: cout << "Enter the year you were born on.\n";
		std:: cout << user_ybirth << '-' << "2011" << '=' << user_ybirth-2011<< std::endl;
		
		std:: cout << "Press y to restart otherwise press any key to return to the main menu.\n";
		std:: cin >> choice;
		if (choice == 'y')
			system("cls");
	}
	while (choice =='y');
	system ("cls");
	std:: cout << "You have chocsen to exit. Press any key to exit.\n";
	char x;
	std:: cin >> x;
	return main();
}

[Code Assassin]

No, your calling them wrong.

You call a function like so:

PlayGame();

You don't need the type when you call a function.

[Code Assassin]

Let me know if that solves your problem :)

[Mesmaroth]

Thank you! lol silly me I forgot.

[Sc2slash]

Also, you shouldn't use stuff like
if (user_problem >= 5)
{
std:: cout << "Whoops! Please pick the right problem.\n";
}
what if the imput is -1? it's not a valid possibility but it isn't bigger or = 5. Just use default: on your switch. That will make it so that ANY inputs other then those you use, in this case 1,2,3,4, will have the same responde.
so you could just use
default:
std:: cout << "Whoops! Please pick the right problem.\n";
break;

also remember that if u want to keep asking for a value until you get a valid one you should probably put that switch inside a while.
Also. the return inside you're function should return a value, in this case of type char
I'm also a beginner myself but i think that's how it works.