C Data Types

int (Integer)

The int type stores whole numbers. It typically occupies 4 bytes of memory and does not support decimals.

float (Floating Point)

A float can store decimal values with less precision. Use %f for output.

double (Double Precision)

double is like float, but with more precision and range (typically 8 bytes).

char (Character)

char stores a single character using ASCII encoding. Use single quotes and the %c specifier.

Size and Range

While actual sizes depend on your machine and compiler, here are common sizes:

• int: 4 bytes
• float: 4 bytes
• double: 8 bytes
• char: 1 byte

Type Mixing (Promotion)

If you mix different types in an expression, C automatically promotes smaller types. For example, adding an int and a float results in a float.

Practice Question

What will this print?

A. 7

B. 7.0

C. error

Hint: The integer a is promoted to a float before addition.

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