2 replies to this topic

[thibault0613]

Hello,

I am studying programming at a beginner level at university and I am stuck into an exercice I would be glad if you could help me to solve it.
we have to implement a menu driven interface for robby(robot).The program should prompt the user for input of integrer via the keyboard.

The menu should provide the following behaviour on typing the number 1-5:

1-move
2-turn left
3-turn right
4-perform a random move(either 1,2 or 3)
5-exit

all other cases should indicate an error
(code)

usingSystem;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace CE0721a
{
classtut6_3
{
publicvoid run()
{
//make object
Robotrobby=newRobot();
Room room=newRoom(8);
Picture picture=newPicture(room,robby);

// declare variable
Random rndm = newRandom(); //random number generator
int command=0;//variable declared to store the command input
do
{
Console.Write("1. move\n");
Console.Write("2.turn left\n");
Console.Write("3. turn right\n");
Console.Write("4. random move\n");
Console.Write("5. exit\n");
while(true)
{
Console.WriteLine("Enter robby command");
command=int.Parse(Console.ReadLine());//input command to variable
}
if (command != 1)
robby.move();
elseif (command != 2)
robby.left();
elseif (command != 3)
robby.right();
{
if (command != 4)
command = rndm.Next(5) + 1; // Random.Next(inclusive low, exclusive high)
}
elseif (command != 5)
exit();
}
}
}
(/code)

Thank you in advance
Best regards
Thibault

[spasticjustice]

Well to start you're saying if(command is not equal to 1); that's what != means. You need to replace it with if(command == 1) and so on for your if statements. Also I don't quite get where you're going with your do while. For me I would have my do while perform while my input was not equal to any of the given choices. That way you have some error checking.

[taburetka]

You can define a function somewhere like this:

void executeCmd(int cmd)

{

    switch(cmd)

    {

        case 1: robby.move(); break;

        case 2: robby.left(); break;

        case 3: robby.right(); break;

        case 5: exit(); break;

        default: Console.WriteLine("Wrong input!"); break;

    }

}

And then your main loop will be something like:

int cmd = 0;

do

{

    Console.Write("1. move\n"); 

    Console.Write("2.turn left\n"); 

    Console.Write("3. turn right\n"); 

    Console.Write("4. random move\n"); 

    Console.Write("5. exit\n");


    Int32.TryParse(Console.ReadLine(), out cmd);

    if (cmd == 4)

        executeCmd(rndm.Next(3)+1);  // should return 1,2 or 3

    else

        executeCmd(cmd);

}

while(true);