C++ software for home work

**rgk44** · 02-14-2006

HI GUys,

As part of my electronics course, we are doing a brief course on programming, but i have been unable to attend my college due to the lifts being down

(wheels for legs)

and now i am far behind,
and i was wondering if theirs a free program that i could use to make such easy programs as below,

thanks

Code:

#include<iostream.h>

void main(void)
{
int voltage,resistance,current;

cout<<"enter current(amps):\t"<<endl;
cin>>current;

cout<<"enter resistance(ohms):\t"<<endl;
cin>>resistance;


voltage=current*resistance;

cout<<"current:\t"<<current<<endl;
cout<<"resistance:\t"<<resistance<<endl;

cout<<"voltage:\t"<<voltage<<endl;
}

**jwenting** · 02-14-2006

it's generally called a brain and everyone comes equipped with one (though quality control isn't the best with the result that there's a large spread in capabilities between units installed, we apologise for the inconvenience).

**twomers** · 02-14-2006

do you mean a compiler?

**~~Yuri~~** · 02-14-2006

Code:

void main(void)

. You better should use:

Code:

int main()

If you mean a compiler I would advice you to use Dev-C++, I use it too.

**rgk44** · 02-14-2006

it's generally called a brain and everyone comes equipped with one (though quality control isn't the best with the result that there's a large spread in capabilities between units installed, we apologise for the inconvenience).

yeh thanks

do you mean a compiler?

sorry, yes, in college we use microsoft c++ 6.0, is there anything like this that i can use thats free, where you write the program like above, and then you can actually run it?

**Wraithan** · 02-14-2006

Dev-C++
Code::Blocks
Microsoft Visual C++ 2005 Express

**rgk44** · 02-14-2006

ive tried visual basics c++ 2005, but when ever i build somthing i get

Cannot open include file: 'iostream.h': No such file or directory

**rgk44** · 02-14-2006

ok, ive just run this program in dev C++, it works on microsft visual C++ 6.0, but not on dev

its asks for the current and then the resistance, but then just closes

Code:

#include<iostream.h>

int main()
{
int voltage,resistance,current;

cout<<"enter current(amps):\t"<<endl;
cin>>current;

cout<<"enter resistance(ohms):\t"<<endl;
cin>>resistance;

voltage=current*resistance;

cout<<"current:\t"<<current<<endl;
cout<<"resistance:\t"<<resistance<<endl;

cout<<"voltage:\t"<<voltage<<endl;
}

**Shakti** · 02-14-2006

That is because there is no iostream.h in the C++ standard, the standard states that the filename is iostream (note, no ".h").

Same goes with fstream, no C++ standard header has .h as extension. Now the problem comes with files that come from C (stdio.h is such a file, basicly that is iostream's equivalent), with those files you take away the .h and add a c to the front, so the C-header stdio.h would be cstdio in C++.

You should also read up on namespaces, but since the book/website/paper you have on C++ seems old and nonstandard i recommend you to go to http://www.cprogramming.com/tutorial.html and use those tutorials instead.

Edit: To answer you latest question: That is because VC++ adds a functionality so that when you run the program through their IDE they will add a pause at end functionality automaticly (this is not added in the actual exe file, only when you run it through the IDE).

To fix this in DevC++ and other compilers you can simply add a "cin.get()" before you call the return 0; in main. One note though, you should make a call to cin.ignore(); after you have done anything with cin, such as cin >> somevar;

Ill give some example code for ya:

Code:

// This will not pause
int main()
{
  return 0;
}


// This will not pause
#include <iostream>
using std::cin;

int main()
{
  int someVar;
  cin >> someVar;
  cin.get();
  return 0;
}


// This will pause:
#include <iostream>
using std::cin;

int main()
{
  int someVar;
  int someOtherVar;

  cin >> someVar;
  cin.ignore();
  cin >> someOtherVar;
  cin.ignore();

  cin.get();
  return 0;
}

**Wraithan** · 02-14-2006

Code:

#include <iostream>

using namespace std;

int main()
{
	int voltage,resistance,current;

	cout<<"enter current(amps):\t"<<endl;
	cin>>current;

	cout<<"enter resistance(ohms):\t"<<endl;
	cin>>resistance;

	voltage=current*resistance;

//put the following in one command and used \n so that the program is a tad more efficient :D
	cout<<"current:\t"<<current
               <<"\nresistance:\t"<<resistance
               <<"\nvoltage:\t"<<voltage<<endl;
	
	cin.ignore(); //incase there is something in the input stream, this clears it so that cin.get(); can work properly
	cin.get(); //so that the program will pause before exiting
	
	return 0; //always return 0 if the program runs successfully
}

Doctored it up for you.

**jwenting** · 02-15-2006

was under the impression you wanted something to write the sourcecode for you... That's what you asked after all, a program to write easy programs

**Blackroot** · 02-15-2006

If their was a program to make programs, programmers would be out a job ^,^. Programmings really not to complex - think of it as an attempt to create a second sun.

.

**jwenting** · 02-15-2006

if you believe the marketing hype around architecture tools you'd think all those pesky programmers were already an unnecessary luxury for companies and all you need is some analyst to draw some UML diagrams and your entire application is ready at the push of a button.

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