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save as "getInput.h"

this will block anything other than numbers when getting a number, and filter a string upon input.

getInputString(bool filterNum,bool filterChar,bool filterSym,bool filterSpace,bool rejectString,string defaultStr);

Explained below.

getInputString(Filter numbers true:false, Filter characters true:false,
Filter symbols true:false, Filter spaces true:false, if bad input replace string with default true:false, default string to replace with "STRING");

    //getInput.h, made by TheUberFail



#include <iostream>

#include <string.h>

#include <windows.h>

#include <conio.h>



using namespace std;



string getInputString(bool filterNum,bool filterChar,bool filterSym,bool filterSpace,bool rejectString,string defaultStr)

{

    string Oinput ="";

    string Ainput ="";



    short counter = 0;

    

    getline(cin,Oinput);

    

    for(short index = 0; index < Oinput.length(); index++)

    {

        if(filterNum)

        {

            if(Oinput[index]<='9'&&Oinput[index]>='1'

            {

                if(rejectString)

                {

                    return defaultStr;

                }

                continue;

            }

        }

        if(filterSym)

        {

            if(!(Oinput[index]<='9'&&Oinput[index]>='1'&&!(Oinput[index]<='Z'&&Oinput[index]>='A'&&!(Oinput[index]<='z'&&Oinput[index]>='a'&&Oinput[index]!=' '

            {

                if(rejectString)

                {

                    return defaultStr;

                }

                continue;

            }

        }

        if(filterSym)

        {

            if((Oinput[index]<='Z'&&Oinput[index]>='A'||(Oinput[index]<='z'&&Oinput[index]>='a')

            {

                if(rejectString)

                {

                    return defaultStr;

                }

                continue;

            }

        }

        if(filterSpace)

        {

            if(Oinput[index]==' '

            {

                if(rejectString)

                {

                    return defaultStr;

                }

                continue;

            }

        }

        Ainput += Oinput [index];

        continue;

    }

    return Ainput;

}



int getNumber()

{

    string ILine = "";

    char input_stream;

    short charCounter = 0;

    int number = 0;

    int power = 0;

    

    for(;

    {

        if(kbhit())

        {

            input_stream = getch();

            if(charCounter!=0)

            {

                if(input_stream == '0'

                {

                    ILine += input_stream;

                    charCounter++;

                    cout<<input_stream;

                }

            }

            if(input_stream >= '1' && input_stream <= '9'

            {

                ILine += input_stream;

                charCounter++;

                cout<<input_stream;

            }

            if(input_stream == 

            {

                if(charCounter!=0)

                {

                    cout<<input_stream<<" "<<input_stream;

                    ILine.erase(ILine.end()-1,ILine.end());

                    charCounter--;

                }

            }

            if(input_stream==13)

            {

                break;

            }

        }

        Sleep(50);

    }

    

    for(short count = 0; count < ILine.length(); count++)

    {

        power =1;

        //if(count != 0)

        {

            for(short sCount = 0; sCount <= count; sCount++)

            {

                power *= 10;

            }

        }

        number += ((((int)ILine[ILine.length()-(count)-1])-4*power);        

    }

    number /= 10;

    return number;

}



void doStringExample()

{

    system("CLS");

    

    string tempStr;

    

    cout<<"\n\tEnter a number: ";

    //                          Dont filter number   Filter alphabet     Filter symbols     Filter spaces   Reject bad input    If rejected, this is default

    tempStr =    getInputString(0,                   1,                  1,                 1,              0,                  "");

    

    cout<<"\n\tYou entered: "<<tempStr;

    

    cout<<"\n\tEnter a sentance with no numbers\n\n\tSentance: ";

    

    //                          filter number       Dont Filter alphabet    Dont Filter symbols     Dont Filter spaces   Reject bad input    If rejected, this is default

    tempStr =    getInputString(1,                  0,                      0,                      0,                    1,                  "You entered numbers!");

    

    cout<<"\n\tYou entered: "<<tempStr;

    

    system("PAUSE");

    system("CLS");

    return;

}

ive always wondered what does system("CLS") do?

Same as the CMD "cls" command. it stands for clear screen.

OH. thats quite useful. like for a tic tac toe game?

It's a bad programming habit, system calls are terrible in general. I don't know why he teaches if he uses them, he should know that.

does it use alot of the memory? system calls

Not much, but just read.

It is bad for several reasons:
-It isn't portable.
-It only works if the OS has the function you call in it. (System refers to OS hypothetically).
This is what system does:

~Halt your program.
~Make a sys call to the OS.
~Relaunch the OS in a sub process.
~Find the command in the process.
~Allocate the memory to execute the command
~Execute the command
~Deallocate the memory
~exit the OS sub process.
~resume your program

Whereas there is usually a better way of doing nearly everything without a system call.
I hope you learned from your mini lesson in programming by Kiwimoosical lulz

is there another way to remove all text on the screen without system calls?

    cout<<"\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n"<<std::endl;

doesnt seem neat though lol.