The series of instructions that tell a computer how to carry out processing tasks is referred as a computer program.
In a computer , most processing takes place in a component called the central processing unit(CPU).
1.1 定义计算机
• A computer stores data Memory is an area of a computer that temporarily holds data that is waiting to be processed, stored, or output.
Storage is the area where data can be left on a permanent basis when it is not immediately needed for processing.
To process large amounts of data, mainframes process billions of instructions per second and often include several central processing units.
Mainframes are large, fast, and fairly expensive computers, generally used by business or government to provide centralized storage, processing ,and management for large amounts of data.