Introduction to Computers

ENIAC: First digital computer. It was built in 1940's. It is quite huge (almost like house in size).
Intel Pentium 4: In 2000. It can perform 1.5 billion operations/ sec : Clock Speed: 1.5 GHz

Google Data Center is equipped with huge number of machines, power systems, cooling systems etc build up of computing machines.

The Computing Machine have memory and processor. We have memory to store information just like houses in colony.

Memory is divided for 

• Program
• Data

There are different type of instructions: some are to be executed whereas some are used to control

Building Blocks of Computer:

• Input
• Memory
• ALU: Control Unit and Arithmetic Unit
• Output

CPU:

• Fetch Instruction
• Execute Instructions
• Store Instructions
• Runs sequence of instructions

CPU performs operations on bits. 

High Level Instructions: X= Y + Z

Low Level Instructions: Add Y,Z

Compilers

Set of tools which convert High Level Language to Assembly Code.

Assembler converts Assembly Code to Machine Code

Program=Solutions

Program is sequence of instructions. It is a solution to a program. It is source code. 

Any solftware developing process starts with problem. 

Given: Problem

Understand specification, Analyze steps, solve problem and program it.

C Programming Language

C is a General purpose language.