How to Restart a Program

[ModcaFox]

I have made a calculator that, from the table of contents you can select a calc. However once you make a calc selection you cannot reselect another calculator without closing the program and opening it up again. I want to make it so that the is the user enters 999 as one of the inputs, the program restarts from the beginning.

here is the code if you want to check:

#include <iostream>
#include <cmath>

using std::cout;
using std::cin;
using std::endl;


int main()

{
	int ToC;

	cout<<"Table of Contents:"<<endl<<endl;
	cout<<"Synthetic Division Calc-1"<<endl;
	cout<<"Quadratic Equation Calc-2"<<endl;
	cout<<"Pythagorean Theorem Calc-3"<<endl;
	cout<<"Which Calculator would you like to use?: ";
	cin>>ToC;
	cout<<endl<<endl;

	//Synthetic Div
	double Z = 0.0;
	double Y = 0.0;
	double T = 0.0;
	double D = 0.0;
	double E = 0.0;
	double R = 0.0;
	double SB = 0.0;
	double RB = 0.0;
	double SC =0.0;
	double RC = 0.0;
	double SD = 0.0;
	double RD = 0.0;
	double SE = 0.0;
	double RE = 0.0;
	double AR = 0.0;
	


	//5 Variables
	while(ToC==1)
	{
	cout<<"Synthetic Division Calculator By Daniel Jomaa"<<endl;
	cout<<"Enter Zero for E if there are only 4 Variables"<<endl;
	cout<<"A = ";
	cin>>Z;
	cout<<"B = ";
	cin>>Y;
	cout<<"C = ";
	cin>>T;
	cout<<"D = ";
	cin>>D;
	cout<<"E = ";
	cin>>E;
	cout<<"Remainder: ";
	cin>>R;
	cout<<""<<endl;
	if(E==0){
	AR = Z;
	SB = R * AR;
	RB = Y + SB;
	SC = RB * R;
	RC = T + SC;
	SD = RC * R;
	RD = SD + D;
	
	cout<<"Coefficients:"<<endl;
	cout<<AR<<", "<<RB<<", "<<RC<<", R:"<<RD;
	cout<<""<<endl;
	cout<<""<<endl;
	cout<<""<<endl;
	}
	else{
	AR = Z;
	SB = R * AR;
	RB = Y + SB;
	SC = RB * R;
	RC = T + SC;
	SD = RC * R;
	RD = SD + D;
	SE = RD * R;
	RE = SE + E;

	cout<<"Coefficients:"<<endl;
	cout<<AR<<", "<<RB<<", "<<RC<<", "<<RD<<", R:"<<RE;
	cout<<""<<endl;
	cout<<""<<endl;
	cout<<""<<endl;
	}
	}

	//Quadratic Calc

	double A=0.0;
	double B=0.0;
	double C=0.0;
	double squareroot =0.0;
	double negative= 0.0;
	double finalanswerone=0.0;
	double tophalfone =0.0;
	double bottomhalf =0.0;
	double tophalftwo =0.0;
	double finalanswertwo =0.0;
	int Negativex = -1;
	double factorxone = 0.0;
	double factorxtwo = 0.0;
	double imaginarynum = 0.0;

	
	


	while(ToC==2)
	{
	cout<<"Quadratic Equation Calculator"<<endl;
	cout<<"A = ";
	cin>>A;
	cout<<"B = ";
	cin>>B;
	cout<<"C = ";
	cin>>C;

	squareroot = B* B - 4* A* C;
	negative = -1*B;
	tophalfone = negative+sqrt(squareroot);
	bottomhalf = 2*A;
	finalanswerone = tophalfone/bottomhalf;
	//first x
	if(squareroot<0){
		imaginarynum = squareroot * Negativex;
		cout<<"X = -"<<imaginarynum<<"i";
		cout<<""<<endl;
	}
	else
	cout<<"X = "<<finalanswerone<<endl;
	
	
	
	//Second X

	tophalftwo = negative-sqrt(squareroot);
	finalanswertwo = tophalftwo/bottomhalf;
	

	if(squareroot<0){
		imaginarynum = squareroot * Negativex;
		cout<<"X = "<<imaginarynum<<"i";
	}
	else
		cout<<"X = "<<finalanswertwo<<endl;
	cout<<""<<endl;
	cout<<""<<endl;
	}
	

	//Pythag theorem

	double AA =0.0;
	double BB =0.0;
	double CC =0.0;
	double Aequalzero =0.0;
	double Bequalzero =0.0;
	double Cequalzero =0.0;
	int error;


	while(ToC==3)
	{
	cout<<"Pythagorean Theorem Calculator by Daniel Jomaa"<<endl;
	cout<<"Enter 0 for Unknown Variables"<<endl;
	cout<<""<<endl;

	cout<<"Enter A: ";
	cin>>AA;
		if(AA!=0)
			error++;
	cout<<"Enter B: ";
	cin>>BB;
		if(BB!=0);
			error++;
	cout<<"Enter C: ";
	cin>>CC;
		if(CC!=0);
			error++;
	cout<<""<<endl;
	if(error==3){
		cout<<"Error; Enter a Zero for one variable"<<endl;
		system("pause");
		exit(EXIT_FAILURE);
	}

	if(AA==0){
		Aequalzero = CC*CC-BB*BB;
		cout<<"A = "<<sqrt(Aequalzero)<<endl<<endl;
	}

	if(BB==0){
		Bequalzero = CC*CC-AA*AA;
		cout<<"B = "<<sqrt(Bequalzero)<<endl<<endl;
	}
	if(CC==0){
		Cequalzero = AA*AA+BB*BB;
		cout<<"C = "<<sqrt(Cequalzero)<<endl<<endl;
	}
	}


system("pause");
return(0);
}

[chicofeo]

You could use a do-while loop on the program. For example:

#include <iostream>
#include <cctype>
using namespace std;

int main()
{
	int number{ 0 };
	char tryAgain{ ' ' };

	do
	{
		cout << "Please enter a number (0-100)" << endl;
		cin >> number;

		while (number < 0 || number > 100)
		{
			cout << "Your input " << number << " is incorrect" << endl;
			cout << "Try again" << endl;
			cout << "Please enter a number (0-100)" << endl;
			cin >> number;
		}

		cout << "Would you like to try again?" << endl;
		cin >> tryAgain;

	} while (toupper(tryAgain) == 'Y');

	cout << "Good Bye!" << endl;

	return 0;

}

The program asks the user to input a number, validates the number according to the parameters and then ask the user if the user would like to try again. If the user press y, then the program will restart. If the user press n, the program will close.

I hope it helps.

[ModcaFox]

Well i wanted it so that the user must only enter something if he/she wants to restart the program. otherwise it should loop as usual.

Thanks