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Assignment help!!

jmg1206 (1)
I have to program a menu with the abillity to go back and select different options. It was working for me until i added case 3 and im not sure why? i dont know if im missing anything or maybe im writting it wrong please help me out.
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#include <iostream>
#include <cmath>
using namespace std;

int main()
{
	bool quit, back;
	int measurement;
	double data;
	
	do
	{
		cout << "0. Quit\n";
		cout << "1. Length\n";
		cout << "2. Mass\n";
		cout << "3. Velocity\n";
		cout << "4. Force\n";
		cout << "5. Pressure\n"; 
		quit = false;
		cin >> measurement;
	
	switch(measurement)
	{
	
		case 0:
		quit = true;
		break;

	
		case 1:
		
		do
		{
			cout << "0. Back\n";
			cout << "1. Millimeters to inches\n";
			cout << "2. Inches to millimeters\n";
			back = false;
			cin >> measurement;
			switch(measurement)

		{
			case 0:
				back = true;
				break;
		
		
			case 1:
				cout << "Enter a length in Millimeters\n";
				cin >> data;
				data /= 25.4;
				cout << "It equals " << data << "in.\n";
				break;

			case 2:
				cout << "Enter a length in Inches\n";
				cin >> data;
				data *= 25.4;
				cout << "It equals " << data << "mm.\n";
				break;

			default:
				break;
			}
		}while(back != true);
			break;
		
		case 2:
			
			do
			{
				cout << "0. Back\n";
				cout << "1. Kilograms to Pounds\n";
				cout << "2. Pounds to Kilograms\n";
				back = false;
				cin >> measurement;
				switch(measurement)
				{
					case 0:
						back = true;
						break;

					case 1:
						cout <<"Enter a mass in Kilograms\n";
						cin >> data;
						data *= 2.2;
						cout << "It equals " << data << "lbs.\n";
						break;

					case 2:
						cout <<"Enter a mass in Pounds\n";
						cin >> data;
						data /= 2.2;
						cout <<"It equals " << data << "Kg\n";
						break;

					default:
						break;
				}
			}while(back != true);
			break;

		case 3:

			do
			{
				cout <<"0. Back\n";
				cout <<"1. Kilometers per hour to Miles per hour\n";
				cout <<"2. Miles per hour to Kilometers per hour\n";
				back = false;
				cin >> measurement;
				switch(measurement)
				{
					case 0:
						back = true;
						break;

					case 1:
						cout << "Enter a velocity in Kilometers per hour\n";
						cin >> data;
						data /= 1.609;
						cout <<"It equals " << data << "Mph\n";
						break;

					case 2:
						cout << "Enter a velocity in Miles per hour\n";
						cin >> data;
						data *= 1.609;
						cout <<"It equals " << data << "Kph\n";
						break;

					default:
						break;
				}
			}while(back != true);
			break;

				
		case 4:
			do
			{
				cout <<"0. Back\n";
				cout <<"1. Newtons to Pound Force\n";
				cout <<"2. Pound Force to Newtons\n";
				back = false;
				cin >> measurement;
				switch(measurement)
				{
					case 0:
						back = true;
						break;

					case 1:
						cout << "Enter a Force in Newtons\n";
						cin >> data;
						data *= .2248;
						cout <<"It equals " << data << "lbf\n";
						break;

					case 2:
						cout << "Enter a Force in Pounds\n";
						cin >> data;
						data *= 4.448;
						cout <<"It equals " << data << "N\n";
						break;

					default:
						break;
				}
			}while(back != true);
				break;
		case 5:
			do
			{
				cout <<"0. Back\n";
				cout <<"1. Pascal to Pound per square inch\n";
				cout <<"2. Pound per square inches to Pascal\n";
				back = false;
				cin >> measurement;
				switch(measurement)
				{
					case 0:
						back = true;
						break;

					case 1:
						cout << "Enter a Pressure in Pascals\n";
						cin >> data;
						data *= .000145;
						cout <<"It equals " << data << "Psi\n";
						break;

					case 2:
						cout << "Enter a Pressure in Pounds per square inch\n";
						cin >> data;
						data *= 6894.757;
						cout <<"It equals " << data << "Pa\n";
						break;

					default:
						break;
				}
			}while(back != true);
				break;

			}
		}while(quit =! true);



		
	system("pause");
	return 0;
}
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