intro to programming week # 2 first program lecture # 3...2016/07/03  · intro to programming week...

Intro to Programming

Week # 2

First Program

Lecture # 3

By: Saqib Rasheed

Department of Computer Science & Engineering

Air University

// First Program

// Author Saqib Rasheed

#include <iostream>

using namespace std;

int main()

{

cout << "Hello world!";

return 0;

}

A First Program - Greeting.cpp

By Saqib Rasheed 2

// First Program

// Author Saqib Rasheed

#include <iostream>

using namespace std;

int main()

{

cout << "Hello world!";

return 0;

}

A First Program - Greeting.cpp

Single Line Comments

By Saqib Rasheed 3

// First Program

// Author Saqib Rasheed

#include <iostream>

using namespace std;

int main()

{

cout << "Hello world!";

return 0;

}

A First Program - Greeting.cpp

Function

Single Line Comments

By Saqib Rasheed 4

// First Program

// Author Saqib Rasheed

#include <iostream>

using namespace std;

int main()

{

cout << "Hello world!";

return 0;

}

A First Program - Greeting.cpp

Function

Opening & Closing brackets Every function in C++ has opening closing brackets 5

// First Program

// Author Saqib Rasheed

#include <iostream>

using namespace std;

int main()

{

cout << "Hello world!";

return 0;

}

A First Program - Greeting.cpp

Function

Opening & Closing brackets Every function in C++ has opening closing brackets

Name of the function

6

// First Program

// Author Saqib Rasheed

#include <iostream>

using namespace std;

int main()

{

cout << "Hello world!";

return 0;

}

A First Program - Greeting.cpp

Function

Opening & Closing brackets

Name of the function

Function returning parameters

By Saqib Rasheed 7

// First Program

// Author Saqib Rasheed

#include <iostream>

using namespace std;

int main()

{

cout << "Hello world!";

return 0;

}

A First Program - Greeting.cpp

an object. It is predefined in C++ to correspond to the standard output stream. 8

// First Program

// Author Saqib Rasheed

#include <iostream>

using namespace std;

int main()

{

cout << "Hello world!";

return 0;

}

A First Program - Greeting.cpp

insertion or put to operator In C : left-shift bit-wise operator

an object. It is predefined in C++ to correspond to the standard output stream. 9

// First Program

// Author Saqib Rasheed

#include <iostream>

using namespace std;

int main()

{

cout << "Hello world!";

return 0;

}

A First Program - Greeting.cpp

quotation marks

an object. It is predefined in C++ to correspond to the standard output stream.

insertion or put to operator In C : left-shift bit-wise operator

10

// First Program

// Author Saqib Rasheed

#include <iostream>

using namespace std;

int main()

{

cout << "Hello world!";

return 0;

}

A First Program - Greeting.cpp

quotation marks

an object. It is predefined in C++ to correspond to the standard output stream.

insertion or put to operator In C : left-shift bit-wise operator

string constant

11

// First Program

// Author Saqib Rasheed

#include <iostream>

using namespace std;

int main()

{

cout << "Hello world!";

return 0;

}

A First Program - Greeting.cpp

string constant

quotation marks

an object. It is predefined in C++ to correspond to the standard output stream.

insertion or put to operator In C : left-shift bit-wise operator

Semicolon Used for termination Of a statement

12

// First Program

// Author Saqib Rasheed

#include <iostream>

using namespace std;

int main()

{

cout << "Hello world!";

return 0;

}

A First Program - Greeting.cpp

Preprocessor directive.

Library File

Namespaces

By Saqib Rasheed 13

// First Program

// Author Saqib Rasheed

#include <iostream>

int main()

{

return 0;

}

A First Program - Greeting.cpp

Preprocessor directive.

Library File

To avoid adding std:: dozens of times in programs we use the using directive instead

std::cout<< "Hello world!";

By Saqib Rasheed 14

// First Program

// Author Saqib Rasheed

#include <iostream>

using namespace std;

int main()

{

cout << "Hello world!";

return 0;

}

A First Program - Greeting.cpp

By Saqib Rasheed 15

Greeting Output

By Saqib Rasheed 16

• Reference Chapter # 2:

C++ Programming Basics by

Robert Lafore

• https://sites.google.com/site/saqibrashied/cplusplus

By Saqib Rasheed 17