C++ Tutorial I

Here i am going to show you some basic C++ Programming... If you have any questions just ask.

Code:

#include <cstdlib> // This must be used if you are going to be a MS-DOS Application.
#include <iostream> // This must be included in the header file if you are going to use "Cout" and "Cin"
using namespace std;

int MittSvar(int tall1, int tall2, char stykke); // Here we make an Function so is going to calculate for us.
void Manual(); // This is user Manual so is going to tell us how to use the Program.

int main(int argc, char *argv[]) // int main() is the program file.
{ 
	// starting program. (Starting Block)
	// we are defind the inputs so you are going to use so the program know how to handle them.
	int tall1; // int = Integer = This will say that only input so will be accepted is integer.
	int tall2; // int = Integer = This will say that only input so will be accepted is integer.
	char stykke; // char = Character = This will say that only input so will be accepted is letters. ect +

	// The Function void does't need any return Value.
	Manual(); // Here will the User Manaul be Displayed.
	system("PAUSE >nul"); // Press an Key to Continue (Hidden).
	system("cls"); // Clear Screen.
	cout<<"Type: "<<endl; // Prints "Type" on the screen.
	cin>>tall1>>stykke>>tall2; // Exampel 13 + 13. Remember to press Enter between them.
	system("cls"); // Clear Screen.
	int svar = MittSvar(tall1, tall2, stykke); // Svar is the return Value of the Function.
	cout<<tall1<<stykke<<tall2<<"="<<svar; // Prints: tall1+tall2=svar (Exampel 20+20=40)
	system("PAUSE >nul"); // Press an Key to Continue (Hidden)
	return 0; // Exit Program.
} // End Program (End Block) 

int MittSvar( // Start of the Calc Function.
int tall1,
int tall2,
char stykke)
{ // (Starting Block)
	int svar; // Answer of the Calc Value is going to be saved in.
	// "if" command is used to true or false. IF (stykke == '+') means if the "char stykke" is + it.
	// int Svar will give answer in +. Exampel (13+13=26) 13 = tall1 , + = stykke , 13 = tall2;
	if (stykke == '+') svar = tall1 + tall2; // Here are we showing the Function how it should act when you put in the Values.
	if (stykke == '-') svar = tall1 - tall2; // Here are we showing the Function how it should act when you put in the Values.
	if (stykke == '*') svar = tall1 * tall2; // Here are we showing the Function how it should act when you put in the Values.
	if (stykke == '/') svar = tall1 / tall2; // Here are we showing the Function how it should act when you put in the Values.
} // (End Block)

void Manual() //Starting Void Function.
{ // (Starting Block)
	cout<<"This is a calc."; // Here is what so should be displayed in the Manual Function.
	cout<<"Writing in what you want to calculate."<<endl; // Here is what so should be displayed in the Manual Function.
	cout<<"Example 20 + 20 = 40. Allowed characters are "; // Here is what so should be displayed in the Manual Function.
	cout<<"'+' . '-' . '/' . '*'"; // Here is what so should be displayed in the Manual Function.
} // (End Block)

 

Good comments! But you should explain in detail how you would put this together as opposed to just showing us. It would help the newbs a lot.

 

Thx for sharing........ useful information.

 

thanks for the comment hanleyhansen i will try remember that to next time..

 

Not bad but, here you define the function as an int rather then a void yet it returns nothing. Why?

Code:

int MittSvar()

Code:

if (stykke == '+') svar = tall1 + tall2; // Here are we showing the Function how it should act when you put in the Values.
    if (stykke == '-') svar = tall1 - tall2; // Here are we showing the Function how it should act when you put in the Values.
    if (stykke == '*') svar = tall1 * tall2; // Here are we showing the Function how it should act when you put in the Values.
    if (stykke == '/') svar = tall1 / tall2; // Here are we showing the Function how it should act when you put in the Values.

Badly made since a switch/case is superior here.

Code:

system("PAUSE >nul");

Never use system calls for this, since you use C++ do cin.getline().

Otherwise great stuff.

 

thanks for your comment Echo
Well i am not so good in C++ i am pretty new to it...

 

No problem.
Keep it up

 

guyz... please help me... send me a software of c++ and examples of this programs to my e-mail address: glrex06@yahoo.com.ph. Thank you in advance...

 

good nice and keep going

 

nice example

 

Thanks guys...

 

C++ is an object-oriented version of C that has been widely used to develop enterprise and commercial applications. C++ became popular because it combined traditional C programming with object-oriented programming features. Smalltalk and other OOP languages did not provide the familiar structures of conventional languages such as C and Pascal. Microsoft's Visual C++ is the most widely used C++ language.

An example:

Code:

#include <iostream>
 
class Bird                 // the "generic" base class
{
public:
  virtual void OutputName() {std::cout << "a bird";}
  virtual ~Bird() {}
};
 
class Swan : public Bird   // Swan derives from Bird
{ 
public:
  void OutputName() {std::cout << "a swan";} // overrides virtual function
};
 
int main()
{
  Swan mySwan;             // Creates a swan.
 
  Bird* myBird = &mySwan;  // Declares a pointer to a generic Bird,
                           // and sets it pointing to a newly created Swan.
 
  myBird->OutputName();    // This will output "a swan", not "a bird".
 
  return 0;
}

 

did you see that Tutorial
Object Oriented Programming c++
Object Oriented Programming C++

 

I don't completely understand the purpose of C++ I really need someone to teach me from scratch

 

Its very good thing to explain how to work in a language.its very useful for newly learner languages.good going keep it up.

 

it is nice.
thanks for help.
it is good for beginners like me. It is helps me.
thanks once more

 

Thanks for share us with a good example of c++. :shy:

 

good