Day3_Part_I.pdf

Lecture #3

Introduction to C Programming

Language

الرحمن الرحيم بسم هللا

L3, CSC121 2014-2015 © Dr. Basheer M. Nasef

Intr. to C

Programmi

ng Structured

Program

Development in

C

C Program

Control

C Functions

C Arrays

Intr. to C++

Programmi

ng

Syllabus

3

Intr. to C programming


Lecture #3

Objectives:

In this Lecture, you’ll learn

To write simple computer programs in

C.

To use simple input and output

statements.

To use the fundamental data types.


Lecture #3

Objectives:

In this Lecture, you’ll learn

To use arithmetic operators.

The precedence of arithmetic

operators.

To write simple decision making

statements..


Book:

7

C Language


How do programs run?

Data Processing Unit

Input Output


Writing C Programs

A programmer uses a text editor to create or

modify files containing C code.

Code is also known as source code.

A file containing source code is called a source

file.

After a C source file has been created, the

programmer must invoke the C compiler before

the program can be executed (run).


A Simple C Program:

Printing a Line of Text


Escape sequence


Escape sequence


Escape sequence


Example: Adding Two Integers.


Example: Adding Two Integers.


Scanf ("%d", &integer1 )

Uses scanf to obtain a value from the user. The

scanf function reads from the standard input,

which is usually the keyboard.

scanf has two arguments, "%d" and &integer1.

The first argument, the format control string,

indicates the type of data that should be input by

the user.

(the letter d stands for “decimal integer”).


Scanf ("%d", &integer1 )

The % in this context is treated by scanf (and printf as

we’ll see) as a special character that begins a conversion

specifier.

The second argument of scanf begins with an ampersand

(&)—called the address operator in C followed by the

variable name.

The ampersand, when combined with the variable name,

tells scanf the location (or address) in memory at which

the variable integer1 is stored.

The computer then stores the value for integer1 at that

location.


Arithmetic in C


Rules of Operator Precedence



Example:



Example:


Decision Making: Equality and Relational Operators


Example:


Example:


Example:


Example: Output


Examples:

Example-3: Write an algorithm in flowchart to

determine the flying time between two cities

given the distance between them and the

average speed of the airplane.


Examples:


convert the temperature from Celsius to

Fahrenheit.


Examples:


compute Salary for any employee.

S= R H - D


Exercises:

Given the equation y = ax3 + 7, which of the

following, if any, are correct C statements for

this equation?


Exercises:

(Arithmetic) Write a program that asks the

user to enter two numbers, obtains them

from the user and prints their sum, product,

difference, quotient and remainder.


Exercises:

(Shapes with Asterisks) Write a program

that prints the following shapes with

asterisks.


Exercises:

(Table of Squares and Cubes) Using only

the techniques you learned in this lect.

write a program that calculates the squares and

cubes of the numbers from 0 to 10 and uses

tabs to print the following table of values:


• Summary of major points so far

program execution begins at main()

keywords are written in lower-case

statements are terminated with a semi-colon

text strings are enclosed in double quotes


Anatomy of a C Program

program header comment

preprocessor directives (if any)

int main ( void )

{

statement(s)

return 0 ;

}


Documents

Day3_Part_I.pdf