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contracts...Elementary Data Types...IntegerType.sol

// SPDX-License-Identifier: GPL-3.0
 
pragma solidity >=0.7.0 <0.9.0;
 
contract IntegerType {
   // uint type is same as uint256
   uint256 aUint;
 
   // int type is same as int256
   int256 anInt;
 
   /* uint8 range 0 to 2 ** 8 - 1 */
   uint8 public aUint8Default;

   uint8 public aUint8 = 123;

   // too high uint8
   uint8 aUint8OutOfBounds = 255;
 
   /* uint16 range 0 to 2 ** 16 - 1 */
   uint16 aUint16;
 
   /* int8 ranges from -2 ** 7 - 1 to 2 ** 7 - 1 */
   int8 anInt8;
 
   /* int16 ranges from -2 ** 15 to 2 ** 15 - 1 */
   int16 anInt16;

   // type only available in incremenets of 8 bits
   uint24 public notAvailable;
 
   // minimum and maximum of int8
   int8 public minInt8 = type(int8).min;
   int8 public maxInt8 = type(int8).max;
 
   // calculate min / max
   int8 public minInt8Calculated = - 2 ** 7; // - 128
   int8 public maxInt8Calculated = 2 ** 7 - 1; // 127
 
    // minimum and maximum of uint8
   uint8 public minUint8 = type(uint8).min;
   uint8 public maxUint8 = type(uint8).max;
 
   // calculate max uint8 (min is 0)
   uint8 public maxUint8Calculated = 2 ** 8 - 1; // 255
}