Built-in data types in C++ - Cheat Sheet & Quick Revision

Recall & Review

beginner

What are built-in data types in C++?

Built-in data types are the basic types provided by C++ to store simple values like numbers, characters, and boolean values. Examples include int, char, float, double, and bool.

beginner

What is the difference between int and float in C++?

int stores whole numbers without decimals, while float stores numbers with decimals (fractional parts).

beginner

What is the size of a bool type in C++ and what values can it hold?

bool typically uses 1 byte and can hold only two values: true or false.

beginner

Which built-in data type would you use to store a single character in C++?

You use the char type to store a single character, like 'a' or 'Z'.

intermediate

What is the difference between float and double?

double stores floating-point numbers with double the precision of float. It uses more memory but is more accurate for decimals.

Which C++ built-in data type is used to store true or false values?

A int

B bool

C char

D float

bool is the type designed to hold true or false values.

What type would you use to store the number 42 in C++?

A bool

B float

C char

D int

The number 42 is a whole number, so int is the correct type.

Which data type can store decimal numbers with more precision?

A double

B char

C int

D float

double stores decimal numbers with more precision than float.

What is the size of a char in C++?

A 1 byte

B 2 bytes

C 4 bytes

D 8 bytes

char typically uses 1 byte to store a single character.

Which of these is NOT a built-in data type in C++?

A int

B double

C string

D bool

string is not a built-in data type; it is a class in the standard library.

List the main built-in data types in C++ and describe what kind of values each stores.

Think about numbers, letters, and true/false values.

Explain the difference between float and double in terms of precision and memory.

One stores decimals more accurately but uses more memory.