C return Keyword
Definition and Usage
The long keyword on its own or when prefixed to int is a data type that is at least 32 bits (4 bytes) long which stores whole numbers. It may extend to 64 bits (8 bytes). To guarantee at least 64 bits use long long.
With 32 bits it can store positive and negative numbers with values between -2147483648 and 2147483647, or between 0 and 4294967295 when unsigned.
With 64 bits it can store positive and negative numbers with values between -9223372036854775808 and 9223372036854775807, or between 0 and 18446744073709551615 when unsigned.
The long keyword can also be prefixed to double to increase the double's precision. The precision of a long double varies based on implementation and may be 64, 80 or 128 bits.
Related Pages
The unsigned keyword can allow a long int to represent larger positive numbers by not representing negative numbers.
Read more about data types in our C Data Types Tutorial.
