Here we introduce you to some primitive data types available in Solidity.
boolean
uint
int
address
// SPDX-License-Identifier: MIT
pragma solidity ^0.7.6;
contract Primitives {
bool boo = true;
/*
uint stands for unsigned integer, meaning non negative integers
different sizes are available
uint8 ranges from 0 to 2 ** 8 - 1
uint16 ranges from 0 to 2 ** 16 - 1
...
uint256 ranges from 0 to 2 ** 256 - 1
*/
uint8 u8 = 1;
uint256 u256 = 456;
uint u = 123; // uint is an alias for uint256
/*
Negative numbers are allowed for int types.
Like uint, different ranges are available from uint8 to uint256
*/
int8 i8 = -1;
int256 i256 = 456;
int i = -123; // int is same as int256
address addr = 0xCA35b7d915458EF540aDe6068dFe2F44E8fa733c;
// Default values
// Unassigned variables have a default value
bool defaultBoo; // false
uint defaultUint; // 0
int defaultInt; // 0
address defaultAddr; // 0x0000000000000000000000000000000000000000
}
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