ProgrammingExamples - User contributions [en]

CPP/CommandLineArguments

2010-06-23T14:54:32Z

Nbaztec: /* CommandLineArguments.cpp */

==CommandLineArguments.cpp==
<source lang="cpp">
#include <iostream>
#include <string>
#include <sstream>

using namespace std;

//test with
//24.5 90.3

int main(int argc, char *argv[])
{
int NumArgs = argc - 1;
cout << "Number of arguments: " << NumArgs << endl;

//argv[0] is the EXE name & is always present.
string FirstArgument = argv[1];
string SecondArgument = argv[2];

cout << "FirstArgument: " << FirstArgument << endl;
cout << "SecondArgument: " << SecondArgument << endl;

stringstream ssArg1, ssArg2;
ssArg1 << FirstArgument;
ssArg2 << SecondArgument;

double dArg1, dArg2;
ssArg1 >> dArg1;
ssArg2 >> dArg2;

cout << "FirstArgument: " << dArg1 << endl;
cout << "SecondArgument: " << dArg2 << endl;

std::string test = argv[1];
cout << "argv[1]: " << argv[1] << endl;
cout << "argv[1] string: " << test << endl;

return 0;
}

</source>

CPP/Classes/PureVirtualFunction

2010-06-23T14:43:17Z

Nbaztec: /* Virtual Functions & Abstract Classes */

==PureVirtualFunction.cpp==
<source lang="cpp">
#include <iostream>
#include <limits>

class Point
{

public:
Point(const double xin, const double yin, const double zin) : x(xin), y(yin), z(zin) {}

double x,y,z;

virtual void Output() = 0;

};

class DerivedClass
{
void Output()
{
std::cout << "Point Class." << std::endl;
}
};

int main(int argc, char *argv[])
{

return 0;
}
</source>

==Virtual Functions & Abstract Classes==
<source lang="cpp">
#include <iostream>

class Vehicle
{
public:
/*
* Here we declare a Pure Virtual Function
* This class has now become an abstract class &
* it's instances cannot be created. Only pointers.
*
*/
virtual void SeeMeGo()=0;
};

/* Some Derived Classes */
class Car : public Vehicle
{
public:
void SeeMeGo()
{
std:cout<<"I'm running at 50mph.\n";
}
};

class Bike : public Vehicle
{
public:
void SeeMeGo()
{
std:cout<<"I'm whooshing at 80mph.\n";
}
};

class Truck : public Vehicle
{
public:
void SeeMeGo()
{
std:cout<<"I'm crawling at 20mph.\n";
}
};

int main(int argc, char *argv[])
{
//Create a Pointer to Abstract Class Vehicle
Vehicle *myVehicle;

//Create Some Objects
Car myCar;
Bike myBike;
Truck myTruck;

//Call Functions
myVehicle = &myCar;
myVehicle->SeeMeGo();

myVehicle = &myBike;
myVehicle->SeeMeGo();

myVehicle = &myTruck;
myVehicle->SeeMeGo();

return 1;
}
</source>

CPP/Classes/PureVirtualFunction

2010-06-23T14:42:47Z

Nbaztec: /* Virtual Functions & Abstract Classes */

CPP/Classes/PureVirtualFunction

2010-06-23T14:40:54Z

Nbaztec: /* Virtual Functions & Abstract Classes */

==PureVirtualFunction.cpp==
<source lang="cpp">
#include <iostream>
#include <limits>

class Point
{

public:
Point(const double xin, const double yin, const double zin) : x(xin), y(yin), z(zin) {}

double x,y,z;

virtual void Output() = 0;

};

class DerivedClass
{
void Output()
{
std::cout << "Point Class." << std::endl;
}
};

int main(int argc, char *argv[])
{

return 0;
}
</source>

==Virtual Functions & Abstract Classes==
<source lang="cpp">
#include <iostream>

class Vehicle
{
public:
/*
* Here we declare a Pure Virtual Function
* This class has now become an abstract class &
* it's instances cannot be created only pointers
*
*/
virtual void SeeMeGo()=0;
};

/* Some Derived Classes */
class Car : public Vehicle
{
public:
void SeeMeGo()
{
std:cout<<"I'm running at 50mph.\n";
}
};

class Bike : public Vehicle
{
public:
void SeeMeGo()
{
std:cout<<"I'm whooshing at 80mph.\n";
}
};

class Truck : public Vehicle
{
public:
void SeeMeGo()
{
std:cout<<"I'm crawling at 20mph.\n";
}
};

int main(int argc, char *argv[])
{
//Create a Pointer to Abstract Class Vehicle
Vehicle *myVehicle;

//Create Some Objects
Car myCar;
Bike myBike;
Truck myTruck;

//Call Functions
myVehicle = &myCar;
myVehicle->SeeMeGo();

myVehicle = &myBike;
myVehicle->SeeMeGo();

myVehicle = &myTruck;
myVehicle->SeeMeGo();

return 1;
}
</source>

User talk:Daviddoria

2010-06-23T14:29:07Z

Nbaztec: Created page with 'Ahh sorry! I was creating a topic when my Connection gave me away.'

Ahh sorry! I was creating a topic when my Connection gave me away.

CPP/Classes/PureVirtualFunction

2010-06-23T14:28:12Z

Nbaztec: /* PureVirtualFunction.cpp */

==PureVirtualFunction.cpp==
<source lang="cpp">
#include <iostream>
#include <limits>

class Point
{

public:
Point(const double xin, const double yin, const double zin) : x(xin), y(yin), z(zin) {}

double x,y,z;

virtual void Output() = 0;

};

class DerivedClass
{
void Output()
{
std::cout << "Point Class." << std::endl;
}
};

int main(int argc, char *argv[])
{

return 0;
}
</source>

==Virtual Functions & Abstract Classes==
<source lang="cpp">
#include <iostream>

class Vehicle
{
public:
//Here we declare a Pure Virtual Function
virtual void SeeMeGo()=0;
};

/* Some Derived Classes */
class Car : public Vehicle
{
public:
void SeeMeGo()
{
std:cout<<"I'm running at 50mph.\n";
}
};

class Bike : public Vehicle
{
public:
void SeeMeGo()
{
std:cout<<"I'm whooshing at 80mph.\n";
}
};

class Truck : public Vehicle
{
public:
void SeeMeGo()
{
std:cout<<"I'm crawling at 20mph.\n";
}
};

int main(int argc, char *argv[])
{
//Create a Pointer to Abstract Class Vehicle
Vehicle *myVehicle;

//Create Some Objects
Car myCar;
Bike myBike;
Truck myTruck;

//Call Functions
myVehicle = &myCar;
myVehicle->SeeMeGo();

myVehicle = &myBike;
myVehicle->SeeMeGo();

myVehicle = &myTruck;
myVehicle->SeeMeGo();

return 1;
}
</source>

CPP/Classes/PureVirtualFunction

2010-06-23T14:25:57Z

Nbaztec:

CPP/Classes/PureVirtualFunction

2010-06-23T14:16:35Z

Nbaztec: /* PureVirtualFunction.cpp */

CPP/Classes/PureVirtualFunction

2010-06-23T14:15:22Z

Nbaztec: /* PureVirtualFunction.cpp */

CPP/Enum

2010-06-23T14:00:25Z

Nbaztec: /* Enum.cpp */

==Enum.cpp==
<source lang="cpp">
#include <iostream>

enum PointType { GOOD, BAD, UNINFORMATIVE };
/*
* Other Ways:
* enum PointType { GOOD = 3, BAD = 6, UNINFORMATIVE = 9};
* enum PointType { GOOD = 2, BAD, UNINFORMATIVE }; GOOD =2,BAD =3,so on...
*/

int main(int argc, char *argv[])
{
PointType A = GOOD;

if(A == GOOD)
{
std::cout << "good" << std::endl;
}
else
{
std::cout << "not good" << std::endl;
}

if(A == BAD)
{
std::cout << "not working" << std::endl;
}
else
{
std::cout << "working" << std::endl;
}

return 0;
}
</source>

CPP/IO/FileInput

2010-06-23T13:58:43Z

Nbaztec: /* FileInput.cpp */

==FileInput.cpp==
<source lang="cpp">
#include <iostream>
#include <fstream>
#include <vector>
#include <string>
#include <sstream>
#include <cstdlib>

void ReadInt(const std::string &Filename);
void ReadIntStringDouble(const std::string &Filename);
void VectorOfLines(const std::string &Filename);
void SkipComments(const std::string &Filename);

/* Example.txt
23
test
4.5
*/

int main(int argc, char *argv[])
{
/*
* Read the filename from the command-line argument.
* argv[0] is the EXE name
*/
std::string Filename = argv[1];

ReadInt(Filename);
//ReadIntStringDouble(Filename);
//VectorOfLines(Filename);
//SkipComments(Filename);
return 0;
}

void ReadInt(const std::string &Filename)
{
std::cout << "Filename: " << Filename << std::endl;

int Integer;

//Create an input stream for file
std::ifstream fin(Filename.c_str());

/*
* If our attempt to open the file has failed
* then display error & exit returning -1
*/
if(!fin )
{
std::cout << "File not found!" << std::endl;
exit(-1);
}

std::string line;
std::stringstream linestream;

getline(fin, line);
linestream.clear();
linestream << line;
linestream >> Integer;

fin.close();

std::cout << "Integer: " << Integer << std::endl;
}

void ReadIntStringDouble(const std::string &Filename)
{
std::cout << "Filename: " << Filename << std::endl;

int Integer;
std::string String;
double Double;

std::ifstream fin(Filename.c_str());

if(fin == NULL)
{
std::cout << "Cannot open file." << std::endl;
}

std::string line;
std::stringstream linestream;

getline(fin, line);
linestream.clear();
linestream << line;
linestream >> Integer;

getline(fin, line);
linestream.clear();
linestream << line;
linestream >> String;

getline(fin, line);
linestream.clear();
linestream << line;
linestream >> Double;

fin.close();

std::cout << "Integer: " << Integer << std::endl;
std::cout << "String: " << String << std::endl;
std::cout << "Double: " << Double << std::endl;
}

void VectorOfLines(const std::string &Filename)
{

std::ifstream fin(Filename.c_str());

if(fin == NULL)
{
std::cout << "Cannot open file." << std::endl;
}

std::vector<std::string> Lines;
std::string line;

while(getline(fin, line))
{
Lines.push_back(line);
}

for(unsigned int i = 0; i < Lines.size(); i++)
{
std::cout << Lines[i] << std::endl;
}

}

void SkipComments(const std::string &Filename)
{
/* test.txt
P3
# example comment
512 512
255

*/
std::ifstream fin(Filename.c_str());

if(fin == NULL)
{
std::cout << "Cannot open file." << std::endl;
}

char MV[2];//the first 2 ascii values
int width, height;
int MPV;//max pixel value

std::string line;

getline(fin, line); //get first line

MV[0] = line[0];
MV[1] = line[1];
std::cout << "MV[0] = " << MV[0] << std::endl;
std::cout << "MV[1] = " << MV[1] << std::endl;

line = "";
getline(fin, line); //get second line
std::string FirstChar = line.substr(0, 1);

if(FirstChar == "#")
{
std::cout << "Skipped this line." << std::endl;
}

line = "";
getline(fin, line); //get third line
std::stringstream LineStream;
LineStream << line;
LineStream >> width >> height;
std::cout << "Width = " << width << std::endl;
std::cout << "Height = " << height << std::endl;
LineStream.str("");

line = "";
getline(fin, line); //get fourth line

LineStream.str("");
LineStream.clear();
LineStream << line;
LineStream >> MPV;

std::cout << "MPV = " << MPV << std::endl;

}
</source>