Data Type Conversion

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Questions and Answers

What is the primary reason for converting user input from a string to an integer in Python when performing mathematical operations?

Mathematical operations cannot be performed directly on strings; they must be converted to numeric types. (correct)
Python automatically converts strings to integers for mathematical operations.
Strings support more complex mathematical operations than integers.
Integers are automatically compatible with input values, while strings are not.

Assume a user inputs '10' in response to the prompt. Analyze the following Python code and predict the error it would produce:

`age = input("Enter your age: ")` `next_year = age + 1` `print(next_year)`

TypeError: can only concatenate str (not "int") to str (correct)
No error; the code will execute and print 11.
SyntaxError: invalid syntax
ValueError: invalid literal for int() with base 10: '10'

Which of the following code snippets correctly converts user input to an integer and adds 5 to it?

`num = input("Enter a number: ")` `int(num) + 5`
`num = str(input("Enter a number: ")) + 5`
`num = input("Enter a number: ") + 5`
`num = int(input("Enter a number: ")) + 5` (correct)

Why is it important to consider the data type of a variable when performing operations in Python?

Different data types have different behaviors and available operations; using the wrong type can lead to errors or unexpected results. (D) Signup and view all the answers

What would happen if you tried to subtract an integer from a string without converting the string to an integer first?

Python would raise a TypeError, indicating that the operation is not supported between a string and an integer. (D) Signup and view all the answers

What would be the result of the following Python code?

number = "5.2"
result = int(number)
print(result)

An error will occur (D) Signup and view all the answers

What is the primary difference between converting a float to an integer versus rounding a float to the nearest integer?

Converting truncates the decimal portion, while rounding adjusts to the nearest whole number. (D) Signup and view all the answers

What is the data type of the variable quantity after executing the following code?

quantity = 10
quantity = str(quantity)

string (C) Signup and view all the answers

If you have a variable `price = 25`, how would you convert it to a float and store it in a new variable named `new_price`?

new_price = float(price) (C) Signup and view all the answers

Which of the following describes what happens when you convert the float `7.9` to an integer in Python?

The decimal portion is removed, and the result is 7. (A) Signup and view all the answers

Why might you need to convert a number to a string in Python?

To concatenate it with another string. (A) Signup and view all the answers

Given `x = '15'` and `y = 3`, what operation would result in the integer `18`?

int(x) + y (B) Signup and view all the answers

Why is it important to understand data type conversions in programming?

It enables you to perform operations between different data types and manipulate data effectively. (D) Signup and view all the answers

Flashcards

What is converting?

Changing a variable's data type.

How to convert to an Integer?

Uses int() to convert a variable to an integer.