noob question, answer probably pretty easy, i just don't know where to start
 

I need to set up 2 buttons to take input from the user, that increase and decrease a variable, it doesn't matter which 2 buttons are used, but preferably the up and down arrows. And I also need to have a display of the variable that constantly updates as it is changed by the user.

Basically what I'm doing is creating a simulated datalogging program used on a car's ECU. So the up and down arrows would be controlling my throttle position percentage. And the display would be constantly showing the percentage of throttle the user is controlling. I already have all the forumulas I need for all the other sensors I plan on showing (RPM, KPH, MAP sensor value, Air/fuel ratio etc etc.) I just need some sort of base sample of code of how to take the user's input in this style and have a constantly updating display.

Thanks guys.

Re: noob question, answer probably pretty easy, i just don't know where to start
 

Is this a console program? That kind of thing is better suited to windowed programs, but you can do it easily if you want:

#include <iostream>

#include <iomanip>

#include <climits> 

#include <windows.h> 



int main()

{

  int count = 0;



  for ( ; ; ) {

    if ( GetAsyncKeyState ( VK_ESCAPE ) != 0 )

      break;

    else if ( GetAsyncKeyState ( VK_UP ) & SHRT_MAX ) {

      if ( count < 100 )

        ++count;

    }

    else if ( GetAsyncKeyState ( VK_DOWN ) & SHRT_MAX ) {

      if ( count > 0 )

        --count;

    }



    std::cout<< std::setw ( 3 ) << count <<"%\r";

    Sleep ( 100 );

  }

}

Re: noob question, answer probably pretty easy, i just don't know where to start
 

 

#include <iostream>

#include <iomanip>

#include <climits> 

#include <windows.h> 

using namespace std;

int main()

{

  int TPP = 0;

  for ( ; ; ) {

    if ( GetAsyncKeyState ( VK_ESCAPE ) != 0 )

      break;

    else if ( GetAsyncKeyState ( VK_UP ) & SHRT_MAX ) {

      if ( TPP < 100 )

        ++TPP;

    }

    else if ( GetAsyncKeyState ( VK_DOWN ) & SHRT_MAX ) {

      if ( TPP > 0 )

        --TPP;

    }

    std::cout<< std::setw ( 2 ) << TPP <<"% Throttle\r";

    Sleep ( 100 );

int RPM

RPM = TPP * 74.5 + 750;

HANDLE hConsole = GetStdHandle ( STD_OUTPUT_HANDLE );

if ( INVALID_HANDLE_VALUE != hConsole )

{

COORD pos = {0, 1};

SetConsoleCursorPosition ( hConsole, pos );

cout << RPM << " RPMs";

}

Okay that throttle stuff worked perfectly, thanks for that :) Now though I'm trying to put in my RPM gauge and I can't seem to get it working right. I have a section of code there that puts it on the second line too. I thought I would be able to figure it out myself but I'm having lots of trouble.

Re: noob question, answer probably pretty easy, i just don't know where to start
 

please help guys