BCA LECTURE-1 C PROGRAMMING

C Programming

Practical Concept

Variable | Data type | Constant

It is used to store value.

m=78;

78 is value

m is variable

a=8.90;

a is variable

8.90 is value

nm=”ashok sir”;

name is always within double quotes.

nm is variable

gender=’M’;

character is always within single quotes.

gender is variable

integer value

float value

string value

character value

datatype

int   %d           float  %f         char  %c

string (character array) %s 

int a; //integer constant

a=78; //correct

a=7.89; //incorrect

float b; //float constant

b=45; //incorrect

b=5.78; //correct

char g; //character constant

g=m; //incorrect

g=f; //incorrect

g=’m’; //correct

g=”f”; //incorrect

//string constant

char nm[20]=”ashok roshan”; //character array or string

string is not datatype in C programming language, string is combination of character that is called character array or string

Rules of Variable name

1.  It can’t begins with numeric.

1m //incorrect

m1 //correct

2.  Space not allowed in variable name

basicsal //correct

basic sal //inccorect

3.  Only _ symbol allowed

basic_sal //correct

basic@sal //incorrect

4.  Reserve word (keyword) can not used as variable name.

Dennis Ritchie is developer of C programming  in 1972 at USA, AT & T Lab (Advance Technology & technique)

BASIC – Beginer All purpose symbolic instruction code

extention of C program file is .c

write C program to display C is procedural Programming language