05 operators, structure

7/30/2019 05 Operators, Structure

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Introduction to C Programming

Operators, programming structures,

functions, strings


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Module Code and Module Title Title of Slides

Statements

A statementis a Specification of an action to

be taken by the computer as the program

executes.

Each C statement must end with thepunctuator/ separator semicolon (;).

For Example:-

c= a+b; But, some of the statements should not

end with semicolon.

For Example, while ( I


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Expressions

An Expression is a Combination of both

Operators and Operands.

For Example:-

city_tax = taxrate * gross_income;

c= a + b;

area = 2 * pi * r;


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Operators

Operators act on Operands.

Basically, by the operands, the operators

are divided into three types:

Unary Operator

Binary Operator Ternary Operator


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Operators

Unary Operator:

An Operator that requires one Operand

is Unary Operator. For Example,

(-p)

p++--i


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Operators

Ternary Operator:

An Operator that acts on three Operands

Otherwise, called as Conditional Operator(?:)

For Example,c = (a > b)? a : b;


7/17Module Code and Module Title Title of Slides

Operators

Binary Operator:

An Operator that requires two

Operands. For Example,

a+b

p-qx/y



Operators

Generally Operators are classified as,

Arithmetic Operators

Relational Operators

Logical Operators



Operators

Arithmetic Operators:

Operator Action

- Substraction,unary minus + Addition

* Multiplication

/ Division% Modulus

-- Decrement

++ Increment



Operators

Relational Operators:

Operator Action

> Greater than

>= Greater than or equal

< Less than



Operators

Logical Operators:

Operator Action

&& AND

|| OR

! NOT



Precedence and Order of Evaluation

Operators Associativity

( ) left to right

! ++ -- right to left

* / % left to right

+ - left to right

< >= left to right= = != left to right



Precedence and Order of Evaluation

Operators Associativity

&& left to right

| | left to right

?: right to left

= += -= *= /= %= right to left



Standard Output function printf()

The Syntax for theprintf() function is,

printf(Format Control String);

printf(Format Control String, print list);

For Example :-

printf(Enter your age:);

printf(%d, age);

printf(Your age of birth is %d, yob );



Standard Input function scanf()

The Syntax for the scanf() function is,

scanf (Format Control String, print list);

Example 1:-

printf(Enter your age:);

scanf(%d,&age);

printf(Type your weight in inches:);

scanf(%d,&weight);



Standard Input function scanf()

Example 2:-

Using Characters:

char a;

scanf(%c,&a);printf(The character is ..%c,a);

Input of String variables:

char name[10];scanf(%s, name);

Gets the charactersuntil the occurrence of

the white space/blank



Quick Review Question

Categorize each of the following as either hardware

or software:

a. CPU

b. compiler

c. ALU

d. Preprocessor Directivese. Input unit

f. A word processor program

05 operators, structure

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