C++

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Calling a Function

Mar 21, 2012 at 1:37am
Timothy Palmer (35)
Why won't this work?
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case 2:
				int grades();
				break;

and when i initialize the function it wont work
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int grades()
{
	vector<int> teachernumber;
	vector<int> studentnumber;
	vector<int> classnumber;
	string schoolname="";
	cout << "This part of the program will average your grades." << endl;
	cout << "Please select the thing you would like to fill out." << endl;
	cout << "[1]Schoolname" << endl;
	cout << "[2]Teacher Info" << endl;
	cout << "[3]Classes" << endl;
	cout << "[4]Students" << endl;
	cout << "[5]Grades" << endl;
	int menu;
	cin >> menu;
	while (menu != 1 && menu != 2 && menu != 3 && menu != 4 && menu != 5)
	{
		cout << "Invalid input" << endl;
		cin >> menu;
	}
	switch (menu)
	{
	case 1:
		cout << "Fill out the school name." << endl;
		cin >> schoolname;
		break;
	case 2:
		cout << "How many teachers are there?" << endl;
		cout << "What is the name of teacher #" << "?" << endl;
		break;
	case 3:
		cout << "How many classes do you have "<< "?" << endl;
		cout << "What is the name of class #" << "?" << endl;
		break;
	case 4:
		cout << "How many students are in " << "?" << endl;
		cout << "What is the name of student #" << "?" << endl;
		break;
	case 5:
		cout << "What are the grades?" << endl;
	}
	return 2182;
}

the program i know wont actually do anything useful but i want to get it so itll at least call it right
Mar 21, 2012 at 1:41am
opiop65 (43)
wait whats your question? I dont even see int grades in case 2.. unless im missing something
Mar 21, 2012 at 1:42am
Timothy Palmer (35)
when i write 2( thus the case 2;) it just displays the main menu again not the actual function
Mar 21, 2012 at 1:42am
opiop65 (43)
oh sorry i see int grades now but whats your question?
Mar 21, 2012 at 1:46am
Timothy Palmer (35)
it wont do the function it wont display the words i have a menu on a loop and it'll just show that menu again instead of doing what i want
Mar 21, 2012 at 1:52am
Timothy Palmer (35)
you want full source code?
Mar 21, 2012 at 2:32am
opiop65 (43)
Yah if you could that would be great.
Mar 21, 2012 at 2:33am
moorecm (1932)
int grades(); is a forward declaration for a function, named grades, that takes no parameters and returns an integer.

int grades; is the declaration and definition of an uninitialized integer variable.

grades(); invokes a function named grades that takes no parameters, similar to the one posted above.

Hope this helps.
Mar 21, 2012 at 2:58am
Timothy Palmer (35)
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#include "stdafx.h"
#include <iostream>
#include <string>
#include <vector>
using namespace std;
string note="";
int grades();
int calculator();
int notes();
int menu= 0;
int main()
{
	system("color C8");

	while (menu == 1||menu == 2||menu == 3||menu == 0)
	{
		cout << "Welcome to TeacherHelp" << endl;
		cout << "This Program will do many things to help teachers." << endl;
		cout << "Write the number of your choice." << endl;
		cout << "[1]Calculator" << endl;
		cout << "[2]Average Grades" << endl;
		cout << "[3]Note" << endl;
		cout << note << endl;
		cin >> menu;
		std::cin.ignore();
			switch(menu)
			{
			case 1:
				int calculator();
				break;
			case 2:
				int grades();
				break;
			case 3:
				notes();
				break;
			default:
				cout << "Invalid Input" << endl;
				cin >> menu;
			}
		}
	return 2182;
}
int notes()
{
	cout << "Create a note" << endl;
	std::getline(std::cin, note);
	return 2182;
}
int grades()
{
	string schoolname="";
	cout << "This part of the program will average your grades." << endl;
	cout << "Please select the thing you would like to fill out." << endl;
	cout << "[1]Schoolname" << endl;
	cout << "[2]Teacher Info" << endl;
	cout << "[3]Classes" << endl;
	cout << "[4]Students" << endl;
	cout << "[5]Grades" << endl;
	int menu;
	cin >> menu;
	switch (menu)
	{
	case 1:
		cout << "Fill out the school name." << endl;
		cin >> schoolname;
		break;
	case 2:
		cout << "How many teachers are there?" << endl;
		cout << "What is the name of teacher #" << "?" << endl;
		break;
	case 3:
		cout << "How many classes do you have "<< "?" << endl;
		cout << "What is the name of class #" << "?" << endl;
		break;
	case 4:
		cout << "How many students are in " << "?" << endl;
		cout << "What is the name of student #" << "?" << endl;
		break;
	case 5:
		cout << "What are the grades?" << endl;
		break;
	default:
		cout << "Invalid Input" << endl;
		cin >> menu;
		break;
	}
	return 2182;
}
Edit & run on cpp.sh
Mar 21, 2012 at 3:00am
Timothy Palmer (35)
moorecm
then what do i do?
Mar 21, 2012 at 3:01am
Timothy Palmer (35)
i see thanks everyone take out the int before grades();
Mar 21, 2012 at 12:31pm
moorecm (1932)
And before calculator(); on line 29. It also looks like you're going to hit the mixing cin and getline problem in the near future.
Last edited on Mar 21, 2012 at 12:33pm
Mar 23, 2012 at 2:56am
Timothy Palmer (35)
yeah already got that and fixed it
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