Parsing input to numeric types in C Sharp (C#) - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is the purpose of parsing input to numeric types in C#?

Parsing input to numeric types converts text input (like strings) into numbers so you can do math or comparisons with them.

beginner

Which method converts a string to an integer and throws an exception if it fails?

The method int.Parse(string) converts a string to an integer but throws an exception if the string is not a valid number.

intermediate

How does int.TryParse differ from int.Parse?

int.TryParse tries to convert a string to an integer and returns true if successful or false if not, without throwing exceptions.

intermediate

What numeric types can you parse input into besides int?

You can parse input into types like double, float, decimal, long, and byte using their respective Parse or TryParse methods.

beginner

Why is it better to use TryParse when parsing user input?

Using TryParse avoids program crashes by safely checking if the input is valid before converting, letting you handle errors smoothly.

Which method throws an exception if the input string is not a valid number?

A int.Parse

B int.TryParse

C Convert.ToInt32

D string.ToInt

int.Parse throws an exception on invalid input, while int.TryParse returns false.

What does int.TryParse return if the input is not a valid integer?

A Throws an exception

B Returns false

C Returns zero

D Returns null

int.TryParse returns false when parsing fails, without throwing exceptions.

Which of these is NOT a numeric type you can parse input into?

A string

B decimal

C long

D double

string is not a numeric type; parsing converts strings into numeric types.

What is the main advantage of using TryParse over Parse?

A It is faster

B It throws exceptions

C It safely handles invalid input without exceptions

D It converts to strings

TryParse safely checks input validity and avoids exceptions.

Which method would you use to convert a string to a floating-point number?

A char.Parse

B int.Parse

C bool.Parse

D float.Parse

float.Parse converts strings to floating-point numbers.

Explain how to safely convert user input from a string to an integer in C#.

Think about a method that tells you if conversion worked without crashing.

Describe the difference between int.Parse and int.TryParse methods.

One method is strict and risky, the other is safe and recommended for user input.