computer programming lecture – 17 to 19

Lecture – 17 to 19Computer Programming

14 Computer Systems Engineering – Second Semester

By: Mr. Ali Asghar Manjotho, Lecturer, CSE-MUET

Contents

• Operators and Operands (LL 02)

• Types of Operators (LL 02)

• Categories of Operators in C++ (LL 02)

• Arithmetic Operators in C++ (LL 04)

• Assignment Operator in C++ (LL 04)

• Arithmetic Assignment Operators in C++ (LL 04)

• Relational Operators in C++ (LL 04)

• Logical Operators in C++ (LL 04)

• Increment and Decrement Operators in C++ (LL 04)

• Problem Examples (LL 04)LL 02 = Learning Level 02 – Comprehension, LL 04 = Learning Level 04 – Analysis

Ali Asghar Manjotho, Lecturer CSE-MUET 2

Operators and Operands

• Almost all of the programs use some sort of data stored in variables.

• In a program different types of operations are performed on that data.

• The data on which operations are performed are known as operands and the types of the operations performed are known as operators.

• For Example:

A + B Operator

Operands


Types of Operators

Unary Operators

• Perform operation on one operand

Binary Operators

• Perform operation on two operands

Ternary Operators

• Perform operation on three operands


Categories of Operators in C++

• Arithmetic Operators ( + , - , / , * , %)

• Assignment Operator ( = )

• Arithmetic Assignment Operators ( += , -= , /= , *= , %=)

• Relational Operators ( > , < , >= , <= , == , !=)

• Logical Operators ( && , | | , ! )

• Increment and Decrement Operators ( ++ , - - )

• Bitwise Operators ( & , | , ~ , ^ , >> , << )

• Conditional Operator ( ? : )


Arithmetic Operators in C++

• They perform arithmetic operations on the program data.


Operation Description Type Example

+ Addition Binary a + b

- Subtraction Binary a - b

/ Division Binary a / b

* Multiplication Binary a * b

% Modulus / Remainder Binary a % b


• Addition, Subtraction, Multiplication and Division operations can be performed on integer numbers as well as floating point numbers.

• Remainder operation can only be performed on integer numbers.

• Floating point operands are not accepted by remainder operator.


Assignment Operator in C++• Assignment operator assigns a constant value, a variable or equation to a single

variable.

• There is one assignment operator ( = ). It is binary operator.

• It assigns anything on its right side to its left side.

float radius = 6.98 ; a = b ; c = ( f – 32 ) / 1.8 ;

= Assignment OperatorAli Asghar Manjotho, Lecturer CSE-MUET 9

Assignment Operator in C++


Arithmetic Assignment Operators in C++• They perform arithmetic operations on two operands and assigns the resultant in

the same first operand.


Operation Description Type Example Same as

+= Addition Assignment Binary a += b a = a + b

-= Subtraction Assignment Binary a -= b a = a - b

/= Division Assignment Binary a /= b a = a / b

*= Multiplication Assignment Binary a *= b a = a * b

%=Modulus / Remainder

AssignmentBinary a %= b a = a % b

Arithmetic Assignment Operators in C++

a += b is same as a = a + b

a = a + b

First operand = a

Second operand = b

Result stored back in to first operand i.e. a


Arithmetic Assignment Operators in C++


Relational Operators in C++• They compare two operands and return 0 or 1. If comparison is successful, they

return 1 else return 0. They are used to create conditions. One relational operator creates one condition.



> Greater Than Binary a > b

< Less Than Binary a < b

>= Greater Than or Equals To Binary a >= b

<= Less Than or Equals To Binary a <= b

== Equals To Binary a == b

!= Not Equals To Binary a != b

Relational Operators in C++


Logical Operators in C++

• They perform logical operations on the logical operands. They return either 0 or 1.

• They combine multiple conditions to form one composite condition.



&& Logical AND Binary a && b

| | Logical OR Binary a | | b

! Logical NOT Unary ! a



a b a && b

0 0 0

0 1 0

1 0 0

1 1 1

a b a | | b

0 0 0

0 1 1

1 0 1

1 1 1

a ! a

0 1

1 0

Logical Operators in C++• Logical AND is also called as Short Circuit AND operator.

If the first operand is false ( 0 ) then it will not check the second operand.

• Logical OR is also called as Short Circuit OR operator.

If the first operand is true ( 1 ) then it will not check the second operand.

int num1 = 5, num2 = 10, num3 = 6, num4 = 15 ;

This will not be checked

cout<< num1 > num2 && num3 < num4 ;

This will not be checked

cout<< num1 < num2 | | num3 != num4 ;


Increment & Decrement Operators in C++

• They are unary operators, who require only one operand.

• They increment or decrement the value of operand by one.

• There are two versions of operators: Prefix and Postfix.


Operation Description Type Example Operation

++ Prefix Increment Unary ++a Increments a, then evaluates a

-- Prefix Decrement Unary --a Decrements a, then evaluates a

++ Postfix Increment Unary a++ Evaluates a, then increments a

-- Postfix Decrement Unary a-- Evaluates a, then decrements a

Increment & Decrement Operators in C++


Program ExamplesLogic circuit diagrams and logical operators in C++


Program Example 01

Problem Statement:

Write a logic circuit solver program in C++ that solves the following logic circuit. Where all the inputs are logic switches (which can be either Turned ON (True, 1) or Turned OFF (False, 0)). The program should display the output value.


Program Example 01


Program Example 02

Problem Statement:

Write a logic circuit solver program in C++ that solves the following logic circuit. Where all the inputs are logic switches (which can be either Turned ON (True, 1) or Turned OFF (False, 0)). The program should display the output value.


Program Example 02


Program Example 03

Problem Statement:

Write a logic circuit solver program in C++ that accepts all the inputs from the user and displays the output of the following circuit. Where all the inputs are logic switches (which can be either Turned ON (True, 1) or Turned OFF (False, 0)).


Program Example 03


computer programming lecture – 17 to 19

Education