Type modifiers in C - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is a type modifier in C?

A type modifier in C changes the meaning or size of a basic data type, like int or char. Examples include signed, unsigned, short, and long.

beginner

What does the unsigned modifier do?

The unsigned modifier tells the compiler the variable can only hold zero or positive values, removing the ability to store negative numbers.

intermediate

How does long int differ from int?

long int usually uses more memory than int, allowing it to store larger numbers. The exact size depends on the system but long means 'longer' or 'bigger'.

intermediate

Can you combine multiple type modifiers? Give an example.

Yes, you can combine them. For example, unsigned long int means a large integer that cannot be negative.

intermediate

What is the difference between signed char and unsigned char?

signed char can hold negative and positive values, while unsigned char holds only non-negative values (including zero). Both store small integers but differ in range.

Which type modifier allows only non-negative values?

A short

B unsigned

C long

D signed

The unsigned modifier restricts values to zero and positive numbers only.

What does short int usually mean?

A A smaller integer type

B A larger integer type

C An unsigned integer

D A floating-point number

short int typically uses less memory than int, so it stores smaller numbers.

Which of these is a valid combination of type modifiers?

A long float

B signed unsigned int

C short double

D unsigned long int

unsigned long int is valid. signed unsigned int is contradictory, and long float or short double are invalid.

What is the default sign for int if no modifier is given?

A unsigned

B long

C signed

D short

By default, int is signed, meaning it can hold negative and positive values.

Which type modifier affects the size of the data type?

A long

B unsigned

C signed

D const

long changes the size (usually larger), while unsigned and signed affect the sign, and const affects mutability.

Explain what type modifiers are in C and give examples.

Think about how you can change the size or sign of a number type.

Describe the difference between signed and unsigned types and why you might use each.

Consider when you need negative numbers or only positive numbers.