Introduction to Programming and Data Types CT5

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Questions and Answers

Which of the following values is an example of a Floating data type?

Ali

3.14159 (correct)

True

What is the correct way to represent a Boolean literal?

False (correct)

true

'False'

"True"

Which of the following is NOT a valid identifier in Python?

plus1

variable_name

_myVariable

1plus (correct)

Which statement is true regarding string literals?

They must always be enclosed in quotes. Signup and view all the answers

How is the value 'Department of CSE-MUET' categorized?

String Signup and view all the answers

What is the primary characteristic of a data literal?

It always has a fixed value. Signup and view all the answers

Which example demonstrates a valid string literal?

'yes' Signup and view all the answers

Which combination accurately represents a Boolean expression?

Is 4 greater than 2 ? True Signup and view all the answers

What is a keyword in Python programming?

A reserved word with a predefined meaning Signup and view all the answers

Which of the following correctly describes a statement in Python?

An instruction that the Python interpreter executes Signup and view all the answers

Which of the following examples is NOT a valid variable name in Python?

2ndVariable Signup and view all the answers

What happens to a variable's type in Python when its value changes?

The variable type can remain the same or change Signup and view all the answers

What is the correct syntax for assigning values to variables in Python?

variable_name = expression Signup and view all the answers

Which of the following is an expression in Python?

20 Signup and view all the answers

Why are variable names case-sensitive in Python?

To allow variables with the same spelling but different meanings Signup and view all the answers

Which of the following is TRUE regarding legal variable names in Python?

They can start with an underscore Signup and view all the answers

What does the exponentiation assignment operator '**=' do?

Raises z to the power of p Signup and view all the answers

Which of the following operators will return a Boolean value?

Comparison operators Signup and view all the answers

Which function is used to convert a float number to an integer?

int() Signup and view all the answers

If z starts at 5, what will be the value of z after executing z -= 2?

3 Signup and view all the answers

What will the expression (p >= q) evaluate to if p = 10 and q = 20?

False Signup and view all the answers

What will happen if you apply the str() function to the number 33?

It will return '33' Signup and view all the answers

If score is 80, which logical expression is True?

score != 80 AND score > 70 Signup and view all the answers

What happens to a variable's value when a new assignment is made?

The previous assignment is overridden. Signup and view all the answers

Which operator produces the remainder of a division?

Modulus (%) Signup and view all the answers

If the variables p and q are assigned the values 2 and 3 respectively, what is the result of p ** q?

8 Signup and view all the answers

Which of the following statements correctly assigns the value 1 to the variables a, b, and c?

a = b = c = 1 Signup and view all the answers

What type of operator is responsible for assigning values to variables?

Assignment Operators Signup and view all the answers

What will be the output of the expression 9 // 2?

4 Signup and view all the answers

Which of the following statements is true about Python variables?

A variable can change type after being assigned. Signup and view all the answers

What is the result of the expression 5 - 2 + 3 * 2?

9 Signup and view all the answers

Study Notes

Data Types

Data can be classified into various types: numbers, strings, and booleans.
Numbers:
- Integers (e.g. -547, 24, 5874)
- Floating-point numbers (e.g. -658.748, 45.214, 0.2547)
Strings: Enclosed in single or double quotes (e.g. "computer", 'ICT110').
Boolean: Represents logical values, either True or False.

Data Literals

Literals: Fixed values for data types.
- Number literals: Written without quotes (e.g. 15, 25.14).
- String literals: Enclosed in quotes (e.g. 'Ali', "computer").
- Multiline strings: Using triple quotes (e.g. '''This is a multiline string''' or """This is a multiline string""").
- Boolean literals: Written without quotes (e.g. True, False).

Identifiers

Identifiers are names for variables, functions, classes, or modules.
Can include letters, digits, and underscores; cannot start with a digit.
Examples: myCountry, other_1, plus1.

Keywords

Reserved words with predefined meaning in Python; cannot be used as identifiers.

Statements and Expressions

Statement: An instruction executable by the interpreter (e.g. z = 1).
Expression: Combination of variables and operators that evaluates to a new value (e.g. z + 20).

Variables

Variables are memory locations for temporary data storage.
Each variable has a name (identifier), a data type, and a value.
Python does not require explicit declaration of the variable's data type.

Legal Variable Names

Variable names can include letters, underscores, and digits.
Cannot start with a number or use Python keywords; are case-sensitive.

Assigning Values to Variables

Variables created by assigning values (e.g. x = 5, name = "Python").
The assigned value can change throughout program execution.
Multiple variables can be assigned the same value simultaneously (e.g., a = b = c = 1).

Operators

Operators perform mathematical or logical operations on data values.
Types of operators in Python:
- Arithmetic Operators: (+, -, *, /, %, **, //)
- Assignment Operators: (=, +=, -=, *=, /=, **=, //=, %=)
- Comparison Operators: (==, !=, >, <, >=, <=)
- Logical Operators: and, or, not.

Arithmetic Operators

Perform operations like addition, subtraction, multiplication, division.
Support modulus and exponentiation operations.

Assignment Operators

Assign computed values to variables (e.g. z += p is equivalent to z = z + p).

Comparison Operators

Return Boolean values (True or False) based on comparisons between values.

Type Conversions

Python allows explicit conversion between data types using:
- int(): Convert to integer.
- float(): Convert to floating-point number.
- str(): Convert to string.

Type Function

The type() function is used to determine the data type of an object.

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Description

This quiz focuses on the fundamental concepts of programming, specifically on data types. You will explore different types of data, including integers, floating-point numbers, strings, and boolean values. Test your understanding of these essential elements in problem-solving and programming.