Introduction to C Programming Language - PPT

C (Programming Language) PSK Technologies By: Arti Sontakke

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1967

History of C

(BCPL (Basic Combined Programming Language) Martin Richard at Cambridge University) 

1970 (B - Ken Thompson at AT & T's Bell Laboratories.)

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1972 (C - Dennis Ritchie at AT & T' Bell Laboratory.)

Definition of c Language C is a procedure oriented Structured programming language .

C is a basic programming language

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Constant in C Language Numeric Constant  Integer constant Eg:1,5,67,346 etc.  Float constant Eg:2.3,8.45,6.8 etc. Character Constant Eg: ’a’ , ’x’ , ‘g’ etc. String Constant Eg:”Hello” ,”good” https://www.psktechnologies.co.in/

DATA TYPES IN C LANGUAGE  There are two types of Data Types Primary Data type Secondary Data type

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Primary Data Type Name Integer

Denoted By int

Format Specifier %d 2 Byte

Float

float

%f

4 Byte

Character char

%c

1 Byte

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Size

Secondary Data Types 1)Pointer 2)Array 3)String 4)Structure

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Variables Of c Language Variable is a name given to a specific memory location . Variable is use to hold the values , variables are always used with data types.

Variable name can be anything.

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Variables inside Memory 

int num=67

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float y=5.8

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Char ch=‘k’

Num=67

Y=5.8

Ch=‘k’

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Rules for declaring variable name The maximum length of variable name is 8 characters and minimum is 1. Variable name can contain numeric values and under score( _ ).

Eg: int num = 6  num_one  num23  num_1 https://www.psktechnologies.co.in/

The first letter of variable name should be start with character Eg: × 1num × _ch Variable name can not contain spaces and points Eg: × num one × num.one https://www.psktechnologies.co.in/

Header files/Prototypes in C Header files contain the definition of functions which are used in programming.

# include<stdio.h> # (Preprocessor directive) stdio (Standard input output) https://www.psktechnologies.co.in/

1) printf() This function is use to print the text message at the output screen.

Eg: printf(â&#x20AC;&#x153;Hello and welcome to c programâ&#x20AC;?);

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2)scanf() This function is use to scan the values.

Eg: int num; float x; char ch; scanf(“%d”,&num); //Here:& gives address scanf(“%f”,&x); scanf(“%c”,&ch); Scanf(“%d%f%c”,&num,&x,&ch); https://www.psktechnologies.co.in/

#include<conio.h> conio (console input/output) clrscr() To clear the previous output screen getch() To print all characters at the output screen and to hold the output screen.

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