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lec20 - Todays Agenda CharacterSet Constants Variables...

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1 Computer Programming I TA C162 . 22/02/07 Today’s Agenda Introduction to C language Structure of a C program Character Set Key words and Identifiers Constants Variables Data Types
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2 Computer Programming I TA C162 . 22/02/07 Structure of a C Language Program /* Program to compute …………………………. */ #include<stdio.h> /*Library files inclusion */ /* Global variable declaration …………………. */ int main() { /* local variable declarations */ /* initialization */ /* statements */ return(0); }
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3 Computer Programming I TA C162 . 22/02/07 Structure of a C Program   Every C program consists of one or more modules called  functions.  One of the functions must be called  main. Execution will always begin by  main.  Each compound statement is enclosed within a  pair of braces   Statement1;   Statement2;    ……… }  Each statement must end with a semicolon (;)  Anything within /* */ treated as comments  Comments may appear anywhere within program
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4 Computer Programming I TA C162 . 22/02/07 Example: A simple C program #include<stdio.h> /*Library files inclusion */ /* Global variable declaration …………………. */ int main() { int num1,num2,sum; /* Variable declaration*/ num1 = 5; /* Initialization */ num2 = 10; sum = num1 + num2; /* Expression */ printf(“Sum of numbers = %d”,sum); /*output*/ return(0); }
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5 Computer Programming I TA C162 . 22/02/07 About C  General purpose structured programming language  Characterized by the ability to write very concise source    program  Comparatively small instruction set  Programs are highly portable
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6 Computer Programming I TA C162 .
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