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Kingdom of Saudi Arabia Prince Norah bint Abdul Rahman University College of Computer Since and Information System CS240. Introduction_Cont . T.Najah Al_Subaie. Objectives:. In this section you will learn: Learn C++ standard library, standard streams and names space.

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introduction cont

Kingdom of Saudi Arabia

  • Prince Norah bint Abdul Rahman University
  • College of Computer Since and Information System
  • CS240

Introduction_Cont.

T.NajahAl_Subaie

objectives
Objectives:
  • In this section you will learn:
  • Learn C++ standard library, standard streams and names space.
  • Learn how to get input from the keyboard.
  • Learn how to write an output on the screen.
  • Learn how to use the escape sequences.
  • Learn C++ syntax rules.
  • Learn how to write a psudocodeand convert it to a C++ program.
c standard library
C++ Standard Library
  • Rich collections of existing code that can be reused in your applications:
    • Common math calculations e.g. sqrt,sin,cos
    • Input/output
    • Date/Time
  • Provided as part of the C++ development environment
  • All C++ library entities are defined in one or more standard headers.
  • You can use the capabilities by referring to the corresponding header file.
iostream library
Iostream Library
  • Part of the C++ Standard Library
  • Provides a uniform way of handling input from (and output) predefined sources.
  • Based on the concept of a “stream”.
  • Stream:
    • Streams are generally connected to a physical source or destination of characters:
      • A disk file, the keyboard, or the screen.
streams 1
Streams(1)
  • Two types:
    • Input streams: used to hold input from a data producer , such as keyboard, a file.
    • Output streams: used to hold output for a particular data consumer such as a monitor, a file or a printer.
streams 2
Streams(2)
  • Standard input stream (cin )
  • Standard output stream (cout)

Note:

  • Keyboard-- program ( cin>>)
  • Program --- screen (cout<<)
using cout
Using cout
  • Stream insertion operator <<
    • Value to right (right operand) inserted into left operand
      • Example:
        • Cout<<“Hello”;
        • Insert the string” Hello” into the standard output stream(cout).
        • Displays to the screen.
    • Escape characters:
      • A character preceded by”\”
      • Indicates “ special “ character output
      • Example:
        • “\n”
        • Courser moves to the beginning of the next line on the screen.
syntax rules
Syntax Rules
  • You must includes <iostream> for cout to work properly.
  • You must use the namespace std for the cout to work properly.
  • C++ is case sensitive. Make sure you don’t’ capitalize any of the letters in C++ keywords.
  • Every statement ends with a ; except for include statements.
  • String literals must be enclosed in “”.
  • Main function must return a value to the OS.
  • Every Opening brace { must have an enclosing brace}.
examples 2 adding integers
Examples(2): Adding integers
  • Write a program that displays the sum of two integers entered at the keyboard:
    • Define the problem precisely.
    • Write the psudocode that will solve the problem
    • Use an Editor to create source code in C++.
    • Use the compiler to
      • Check that source code obeys the language rules.
    • If no errors: Execute your program.
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