Which Algorithm To Use?

[Munki]

Originally Posted by Kreij

Having a book for reference will come in handy, Munki. It's easier that always having to search through the net for answers for basics.

As soon as you get some code going, post it here so we can take a look at it and help you out.

PS. I have no idea what Onafets is talkiing about either. lol

Well, I did it made a simple calculator, and then amazingly deleted it (perminatly)


ALTHOUGH! Im going to redo it anyways just to give me more practice, and then ill post the code up.

[andrewsmc]

Reading all this just makes me feel stupid!

[Munki]

Okay so I just did a simple code. It wasnt compiled or debuged. Im copy and paste straight from my script.

#include <iostream>
#include <cstdlib>

using namespace STD;

int main()

{
  double num;
  double num2;
  char input;
  For (;;)
  { 
  
  Do
   {
  
  COUT << "Welcome to Th3 C41c";
  COUT << "To begin Choose what function you would like to preform from the list provided for you";
  COUT << "1 - Addition";
  COUT << "2 - Subtraction";
  Cout << "3 - Multiplication";
  Cout << "4 - Divide";
  Cin >> input
  }
  while ( input > 1 || input < 4 );
  { Case '1';
          Cout << "Please enter your first number";
          Cin >> num;
          Cout << "Please enter your second number";
          cin >> num2;
          Cout << num + num2;
    Case '2';
          Cout << "Please enter your first number";
          Cin >> num;
          Cout << "Please enter your second number";
          Cin >> num2;
          Cout << num - num2;
   Case '3';
          Cout << "Please enter your fist number";
          Cin >> num;
          Cout << "please enter your second number";
          cin >> num2;
          Cout << num * num2;
   Case '4';
          Cout << "Please enter your first number";
          Cin >> num;
          Cout << "Please enter your second number";
          Cin >> num2;
          Cout << num / num2;
          }
Return 0;
}

[Kreij]

You have a couple of problems.

First, you while statment is only looping on 2 and 3.
You want to fo something like (input >= 1 && input <= 4) so you include 1 and 4

You will also need a switch statement in order to use the case statements

switch (input)
{
    Case '1':
    .....
}

Notice the case statement ends with a colon, not a semicolon.

[Munki]

Originally Posted by Kreij

You have a couple of problems.

First, you while statment is only looping on 2 and 3.
You want to fo something like (input >= 1 && input <= 4) so you include 1 and 4

You will also need a switch statement in order to use the case statements

switch (input)
{
    Case '1':
    .....
}

Notice the case statement ends with a colon, not a semicolon.

Oh okay.Well there wasn't as many mistakes as I thought there was going to be. haha. I fully understand everything but the For loop portion of my mistake. Im going to fix that and try to figure that out. For my first real code, it wasnt that bad.

[Munki]

Sorry for the double post, but this is irrealivant to what the previous post said and if i were to edit, no one would see it as they have already looked at it without this.


Can I buy a complier? If so, Where?

(p.s. I just made another calculator that does Square Root. When Visual Studio gets done downloading i will test and post if anyone wants to see it.)

[Kreij]

You can download Microsoft's C++ express for free.
http://www.microsoft.com/Express/VC/

[Munki]

Originally Posted by Kreij

You can download Microsoft's C++ express for free.
http://www.microsoft.com/Express/VC/

Well I just downloaded the Microsoft Visual Studio 2010 Beta 2. Do you feel one is better than the other?

[Kreij]

In all honesty, Munki, at the level you are programming any version will do fine.
No offense intended, but you have to start somewhere and you are off to a great start !!!
I think that you find using the Integrated Development Environment (IDE) that the Visual Studio products integrate will make you life much easier.
Don't worry about what compiler/IDE is better, work on learning using the language you are working with, and in particular, learn the basics very well.

Keep the questions coming.

[Munki]

Originally Posted by Kreij

In all honesty, Munki, at the level you are programming any version will do fine.
No offense intended, but you have to start somewhere and you are off to a great start !!!
I think that you find using the Integrated Development Environment (IDE) that the Visual Studio products integrate will make you life much easier.
Don't worry about what compiler/IDE is better, work on learning using the language you are working with, and in particular, learn the basics very well.

Keep the questions coming.

No offense taken (I know its true )


I built another script that does, Addition, Subtraction, Multiplication, Division and square root. I'm getting errors that i cant find the error. I ran debugger but I do not understand why its like that, I go back to the line(s) and it appears right to me. Ill access my external and post up the code in case you have time time to check it out.

#include <iostream>
#include <math>
#include <cstdlib>

using namespace STD;

int main ()

{
 Double num;
 Double num2;
 Char input;
 For (;;)
{ 
 Cout << " Please select your function. ";
 COut << " 1 - Addition ";
 Cout << " 2 - Subtraction";
 Cout << " 3 - Multiplication ";
 Cout << " 4 - Division ";
 Cout << " 5 - Square Root:;
}
While ( input <= '1' && input >= '5' )
Switch (input)
{
 Case '1':
	Cout << " Please input your first number ";
	Cin >>  num;
	Cout << " Please input your second number ";
	Cin >> num2;
	Cout << num + num2;
 Case '2':
	Cout << " Please input your first number ";
	Cin >> num;
	Cout << " Please input your second number ";
	Cin >> " num2;
	Cout << num - num2; 
 Case '3':
	Cout << "Please input your first number ";
	Cin >> num;
	Cout << "Please input your second number ";
	cin >> num2;
	Cout num * num2;
 Case '4':
	Cout << " Please input your first number ";
	Cin >> num;
	Cout << " Please input your second number ";
	Cin >> num2;
	Cout << num / num2;
 Case '5':
	Cout << " Please input the number you want to find the square root of. ";
	Cin >> num;
	if ( num < 0 )
{
 	Cout << "Number is negative. ";
}
	Else
{ 
	num2 = sqrt(num);
	Cout << num2;
}
Return 0;
}

I'm going to continue to try to locate this error.

[Kreij]

While ( input <= '1' && input >= '5' )

This is backward ... should be (input >= '1' && input <= '5')

Also in case '3' The output should be cout << num * num2; (You are missing the '<<')

What error are you getting ?

[Munki]

Well for the most part it was claiming that COUT, and CIN were not called (initiated)


My compiler is installing on this computer. I wish I could install it on a jump drive so I didn't have to install it on 7 computers.


Im going to add some 'breaks' throughout the code to keep it from leaking through. I fixed my less than and greater than error. As well as my COUT error. Im going to end the forever loop, seeing as to how I blankly failed to do so. And finally added my Switch statement within the brackets.

[Munki]

Isnt
#include <iostream> suppose to declare COUT and CIN?

[Kreij]

If you are using Visual C++ add #include "stdafx.h" above the iostream include.

Don't capitalize cout.