What are the different data types?

Solidity is a statically typed language; the type of data a variable holds needs to be predefined. By default, all bits of the variables are assigned to 0. In Solidity, variables are function scoped; that is, a variable declared anywhere within a function will be in scope for the entire function regardless of where it is declared.

Now let's look at the various data types provided by Solidity:

• The most simple data type is bool. It can hold either true or false.
• uint8, uint16, uint24 ... uint256 are used to hold unsigned integers of 8 bits, 16 bits, 24 bits ... 256 bits, respectively. Similarly, int8, int16 ... int256 are used to hold signed integers of 8 bits, 16 bits ... 256 bits, respectively. uint and int are aliases for uint256 and int256. Similar to uint and int, ufixed and fixed represent fractional numbers. ufixed0x8, ufixed0x16 ... ufixed0x256 are used to hold unsigned fractional numbers of 8 bits, 16 bits ... 256 bits, respectively. Similarly, fixed0x8...