CS110: PROGRAMMING LANGUAGE I Computer Science Department
Lecture 1: Introduction
Lecture Contents 2
Course Info. Elements of a Computer system. Evolution of programming languages The code Life Cycle
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Course info 3
Website cs110spr14.wordpress.com Books Course plan Assessment methods and grading Labs and practical assignments Practical exam
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Elements of a Computer System 4
Hardware
Computer Software
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Hardware 5
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Memory Unit 6
Ordered sequence of cells or locations Stores instructions and data in binary Types of memory Read-Only
Memory (ROM) Random Access Memory (RAM)
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Binary Data Bit: A binary digit 0 or 1. A sequence of eight bits is called a byte. Computer Science Department
ASCII Code 8
Every letter, number, or special symbol (such as * or {) on your keyboard is encoded as a sequence of bits, each having a unique representation. The most commonly used American Standard Code for Information Interchange (ASCII).
Central Processing Unit (CPU) 9
Executes stored instructions Arithmetic/Logic Unit (ALU) Performs
arithmetic and logical operations
Control Unit Controls
the other components Guarantees instructions are executed in sequence
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Input and Output Devices 10
Interaction with humans Gathers data (Input) Displays results (Output)
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Software 11
System programs
loads first when you turn on your PC Also called the operating system. The operating system monitors the overall activity of the computer and provides services, such as memory management, input/output activities, and storage management.
Application programs
perform specific tasks Examples :
Word processors spreadsheets, and games
Both operating systems and application programs are written in programming languages. Computer Science Department
Are Computers Intelligent? 12
Do we really need to be involved in programming computers? They
have beaten world chess champions. They help predict weather patterns. They can perform arithmetic quickly.
So, a computer has an IQ of _____.
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What is Computer Programming? 13
Planning or scheduling a sequence of steps for a computer to follow to perform a task. Basically, telling a computer what to do and how to do it. A program: A
sequence of steps to be performed by a computer. Expressed in a computer language.
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Computer Languages 14
A set of Symbols
(punctuation), Special words or keywords (vocabulary), And rules (grammar)
