Chief among numeric data types are the integers. Most modern computers store integers in two s complement binary notation.
Some computers support unsigned integers as well as signed integers.
An unsigned integer has no sign bit and all the bits contain data. For numbers that can t be expressed as an integer, such as decimals, floating-point numbers are used. Most computers have instructions for doing floating point arithmetic. Many computers have separate registers for holding integer operands and for holding floating-point operands. These instructions need to know the carry out of bit 3.