Please help! I keep getting errors with my do while loop

[bunkabee]

I keep getting while loop errors in MSVS 2013.
The errors are intellisense expected a while on lines 100 and 103 and error C2059 expected a '}' on lines 100 and 102. Please help me. I'm so lost.

  /* -----------------------------------------------------------------------------
FILE:              Math_Testor.CPP 
DESCRIPTION:        
COMPILER:          Tell another programmer what development tools were used
to build the program 
NOTES:             Put other information here ... 
MODIFICATION HISTORY: Author                  Date               Version
                     ---------------         ----------         --------------
                     Kendelle Innis           2016-11-04             1 
----------------------------------------------------------------------------- */

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


using namespace std;

char choice;
void addition(int mod);
void subtraction(int mod);
void mainMenu();
void difficultyMenu();


int main()
{
	srand(time(NULL));
	do
	{
		mainMenu();

		switch (choice)
		{
		case 'a':
			do
			{
				difficultyMenu();

				switch (choice)
				{
				case '1':
					addition(9);
					break;
				case '2':
					addition(99);
					break;
				case '3':
					addition(999);
					break;
				case '4':
					addition(9999);
					break;
				case '5':
					addition(99999);
					break;
				default:
					cout << choice << " is not a valid entry. Please try again" << endl;
					while (choice != 6)
					{
						mainMenu();
					}
				}
				

		case 'b':
			difficultyMenu();

			switch (choice)
			{
			case '1':
				subtraction(9);
				break;
			case '2':
				subtraction(99);
				break;
			case '3':
				subtraction(999);
				break;
			case '4':
				subtraction(9999);
				break;
			case '5':
				subtraction(99999);
				break;
			case '6':
				break;
			default:
				cout << choice << " is not a valid entry. Please try again" << endl;

			}

			while (choice = 'q');
			{
				return 0;
			}
			}

		}
	}
}

void mainMenu()
{
	cout << "            Arithmetic Practice Program                 " << endl;
	cout << "Hello, and welcome to the Math Skills Practice Program." << endl;
	cout << "This program allows you to practice your math skills." << endl;
	cout << "Choose what you want to practice in the menu shown below" << endl;
	cout << "--------------------------------------------------------" << endl;
	cout << "             ARITHMETIC PRACTICE PROGRAM              " << endl;
	cout << "                     MAIN MENU                        " << endl;
	cout << "--------------------------------------------------------" << endl;
	cout << "                 a. Addition                            " << endl;
	cout << "                 b. Substraction                        " << endl;
	cout << "                 c. Multiplication                      " << endl;
	cout << "                 d. Division                            " << endl;
	cout << "                 q. Quit the program                    " << endl;
	cout << "--------------------------------------------------------" << endl << endl;
	cout << " Enter your choice [a, b, c, d or q]:";
	cin >> choice;
	system("cls");
}
void difficultyMenu()
{
	cout << "Please select difficulty" << endl;
	cout << "1. 0-9" << endl;
	cout << "2. 0-99" << endl;
	cout << "3. 0-999" << endl;
	cout << "4. 0-9999" << endl;
	cout << "5. 0-99999" << endl;
	cout << "6. Return to Main Menu" << endl;
	cout << "Please select 1-6: ";
	cin >> choice;
	system("cls");
}
void addition(int mod)
{
	int answer = rand() % 3;
	int random1, random2;
	char ans;
	random1 = 1 + (rand() % mod);
	random2 = 1 + (rand() % mod);
	cout << "What is " << random1 << " + " << random2 << " = ?" << endl << endl;
	

	int percentage = rand() % 10;
	int corrt = random1 + random2;
	int mc_answers[3];

	if (percentage < 80)
	{

		mc_answers[0] = corrt;
		for (int i = 1; i<3; i++)
		{
			mc_answers[i] = rand() % mod;
		}

		  
		int temp = mc_answers[answer];
		mc_answers[answer] = corrt;
		mc_answers[0] = temp;
	}
	else
	{
		for (int i = 0; i<3; i++)
		{
			mc_answers[i] = rand() % mod;
		}
	}
	cout << "a. " << mc_answers[0] << endl;
	cout << "b. " << mc_answers[1] << endl;
	cout << "c. " << mc_answers[2] << endl;
	cout << "d. None of the Above " << endl;

	cout << "Please select an answer [a-d]: ";
	cin >> choice; 
		if (choice == random1 + random2)
		{
			cout << "Congratulations. That is correct." << endl;
		}
		else
		{
			cout << "That is incorrect.";
		}
}
void subtraction(int mod)
{
	int random1, random2;
	char ans;
	random1 = 1 + (rand() % mod);
	random2 = 1 + (rand() % mod);
	cout << "What is " << random1 << " + " << random2 << " = ?" << endl << endl;
	cout << "Please select an answer [a-d]" << endl;

	int percentage = rand() % 10;
	int corrt = random1 - random2;
	int mc_answers[3];

	if (percentage < 80)
	{

		mc_answers[0] = corrt;
		for (int i = 1; i<3; i++)
		{
			mc_answers[i] = rand();
		}

		int answer = rand() % 3;
		int temp = mc_answers[answer];
		mc_answers[answer] = corrt;
		mc_answers[0] = temp;
	}
	else
	{
		for (int i = 0; i<3; i++)
		{
			mc_answers[i] = rand();
		}
	}
	cout << "a. " << mc_answers[0] << endl;
	cout << "b. " << mc_answers[1] << endl;
	cout << "c. " << mc_answers[2] << endl;
	cout << "d. None of the Above " << endl;


}

[wildblue]

You have the starts of do..while loops on lines 31 and 38, but there's only one while on line 95 while (choice = 'q');, which doesn't seem to match up. (Also - I think you want the equality operator == there, not assignment =.)

[bunkabee]

Hi! Thank you for the response. I do have a while statement on line 59 however. Thank you for pointing out the assignment operator btw. So I'm still not sure why I would get these errors because I have do have a while statement on line 59

[wildblue]

Sorry I missed that earlier while. That while seems to be part of the default case of the switch statement.

while (choice != 6)
{
mainMenu();
}

I think this is what the code is trying to do with the nested loops and switches? Outer do..while controls the main menu of math options until they choose to quit the program, inner do..whiles control the difficulty submenu for each math type until they choose to stop working on that math type.

(I've pulled out the interior code of the cases and made separate choice variables local to main instead of a single global choice, assuming the menu functions return a value.)

int main()
{
	srand(time(NULL));
	char arithmeticchoice;
	int difficultychoice;

	do
	{
		arithmeticchoice = mainMenu();

		switch (arithmeticchoice)
		{
    		case 'a':
    		
    			do{
    				difficultychoice = difficultyMenu();
    
    				switch (difficultychoice)
    				{
    				 // cases				
    				}
    			
    			}(while difficultychoice != 6) // break out of this loop if they want to stop with addition)	

    			break;
    
    		case 'b':
    		
    		    do{
    			    difficultychoice = difficultyMenu();
    
    			    switch (difficultychoice)
    			    {
    			      // cases
    			    }
    			
    			}(while difficultychoice != 6) // break out of this loop if they want to stop with subtraction)

    			break;

            //other cases for multiplication and division
            
		} // end switch on arithmetic choice
		
	}while (arithmeticchoice != 'q'); // break out of this loop if they want to quit program
	
	
    return 0;
    
}// end main