How is unsigned used in C++?

In C++, unsigned is a data type modifier used to declare variables of unsigned integer type. The keyword unsigned is used to define variables of unsigned integer type, meaning the variable does not include negative numbers and can only contain non-negative integers.

Unsigned integer types can include unsigned char, unsigned short, unsigned int, unsigned long, and so on. The range of values for these types is from 0 to 2 to the power of n minus 1, where n is the number of bits occupied by that type.

Using the unsigned data type can save memory space since there is no need to reserve space for a sign bit. The unsigned data type is mainly used to represent data that cannot be negative, such as array indices and loop counters. It is important to ensure that there are no overflow situations when using unsigned integer types as they do not support negative numbers.