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Questions and Answers
What are the types of operators based on their mission? (select all that apply)
What are the types of operators based on their mission? (select all that apply)
Which of the following is NOT a true statement about Unary Operators?
Which of the following is NOT a true statement about Unary Operators?
What is the difference between preincrement and postincrement?
What is the difference between preincrement and postincrement?
Assignment operators are always binary operators.
Assignment operators are always binary operators.
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What is the result of x = 3 + 4 * 2 according to the order of precedence?
What is the result of x = 3 + 4 * 2 according to the order of precedence?
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What is the purpose of parentheses in an expression?
What is the purpose of parentheses in an expression?
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The && operator represents logical OR in C++.
The && operator represents logical OR in C++.
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What is the Boolean value of true || false?
What is the Boolean value of true || false?
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In the conditional operator (?:), the condition determines which value is returned.
In the conditional operator (?:), the condition determines which value is returned.
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Match the following operators to their corresponding types:
Match the following operators to their corresponding types:
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In the code int x = -10; bool flag = x;, the variable flag will hold the value of true.
In the code int x = -10; bool flag = x;, the variable flag will hold the value of true.
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What happens when an attempt is made to use the modulus operator (%) with non-integer operands in C++?
What happens when an attempt is made to use the modulus operator (%) with non-integer operands in C++?
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Having spaces between operator pairs like ==, !=, or <= in C++ is allowed.
Having spaces between operator pairs like ==, !=, or <= in C++ is allowed.
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Study Notes
Computer Programming (1) - Lecture Notes
- Course: Computer Programming (1)
- Lecture No.: 5 - Operators
- Lecturer: Dr. Khaled Mohammed bin Abdl
- Department: Information Technology
- College: Applied Science
- University: Seyion University
- Semester: 1, 2023
Content
- C++ operators
- Assignment operators
- Arithmetic operators
- Increment and decrement operators
- Decision-making operators (logical and relational)
- Conditional operator
- Precedence and associativity of operators
- Common errors
Operators
- Data connectors within expressions or equations
- Concept related:
- Operand: Data that an operator connects and processes
- Resultant: Answer when an operation is completed
- Operator types based on their mission:
- Assignment
- Arithmetic: addition, subtraction, modulo division, etc.
- Relational: equal to, less than, greater than, etc.
- Logical (decision-making): NOT, AND, OR
Operators (cont.)
- Operators types based on number of operands:
- Unary operators:
- Have only one operand
- Can be prefix or postfix
- Examples: !, ++, --
- Binary operators:
- Have two operands
- Infix notation
- Examples: +, -, *, /, %, &&, ==
- Ternary operators:
- Have three operands
- Example: ?:
- Unary operators:
Assignment Operators
- Assignment statement form:
varName = expression; - Binary operators
- Expression evaluated and assigned to the left-side variable
- Shorthand notation:
-
varName = varName operator expression;(e.g.,c = c + 3;) -
varName operator= expression;(e.g.,c += 3;)
-
- Assignment between objects of the same type is supported.
Arithmetic Operators
- All are binary operators
- Operations: addition (+), subtraction (-), multiplication (*), division (/), modulus (%), etc.
- Arithmetic expressions in a straight-line form
- Parentheses () used for maintaining priority of manipulation
Arithmetic Operators Precedence
- Operators in parentheses evaluated first (nested/embedded parentheses evaluated first). Innermost parentheses first, then move outward.
- Operators in innermost pair first
- Multiplication, division, modulus next (applied from left to right)
- Addition, subtraction applied last (applied from left to right)
Arithmetic Operators Precedence (cont.)
- Order of Evaluation (Precedence):
- Parentheses
- Multiplication, division, modulus
- Addition, subtraction
Example
- Algebraic statement:
Z = pr % q + w / (x - y) - Equivalent C++ statement:
z = p * r % q + w / (x - y);(Note operator precedence)
Example, count
- Algebraic example:
m = (a + b + c + d + e)/5 - Equivalent C++ statement:
m = (a + b + c + d + e) / 5;
Increment and Decrement Operators
- Unary operators
- Adding 1 to (or subtracting 1 from) a variable's value
- Increment operator (same as
c = c +1orc+=1) - Decrement operator (same as
c = c -1orc-=1)
Increment and Decrement Operators (cont.)
- Operator types:
- Preincrement (e.g., ++a)
- Postincrement (e.g., a++)
- Predecrement (e.g., --b)
- Postdecrement (e.g., b--)
Examples (increment/decrement)
- Illustrative example C++ code and output demonstrating increment/decrement
Common Compilation Errors
- Attempting to use the modulus operator (%) with non-integer operands.
- Spacing errors (eg., missing space between operators).
- Reversing order of operators (
=!instead of!=). - Incorrect use of assignment operator (=) instead of equality operator (==).
Relational and Equality Operators
- Binary operators
- Return true or false
Logical Operators
- Used to combine multiple conditions
- AND (
&&): true if both conditions are true - OR (
||): true if either condition is true
Logical Operators (cont.)
- NOT (
!): true when condition is false, returns opposite value of condition
Conditional Operator
- Ternary operator that requires three operands
- Syntax:
Condition ? true_expression : false_expression
Examples (conditional operator)
- Demonstrative C++ code showing usage of the conditional operator.
Exercise - 1 (output)
- Illustrative example
Exercise - 2 (error)
- Explanation of a compilation error
End, Q&A
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Description
Test your knowledge on operators in C++ with this quiz based on the Computer Programming (1) course. Focus on various types of operators, their functionalities, and common errors associated with them. Perfect for students looking to strengthen their understanding of programming concepts.
