C Programming Language Tutorial for beginners - JavaTpoint

C Programming Language
tutorial
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What is c language:-
C is mother language of all programming
language.
 It is system programming language.
 It is procedure-oriented programming
language.
 It is also called mid level programming
language.

History of c language:-
C programming language was developed in
1972 by Dennis Ritchie at bell laboratories of
AT&T(American Telephone & Telegraph),
located in U.S.A.
 Dennis Ritchie is known as founder of c
language.
 It was developed to be used in UNIX
Operating system.
 It inherits many features of previous
languages such as B and BPCL.

Language year Developed By
ALGOL 1960 International Group
BPCL 1967 Martin Richards
B 1970 Ken Thompson
Traditional C 1972 Dennis Ritchie
K & R C 1978 Kernighan & Dennis
Ritchie
ANSI C 1989 ANSI Committee
ANSI/ISO C 1990 ISO Committee
C99 1999 Standardization
Committee

Features of C Language:-
There are many features of c language are given below.
1) Simple
2) Machine Independent or Portable
3) Mid-level programming language
4) structured programming language
5) Rich Library
6) Memory Management
7) Fast Speed
8) Pointers
9) Recursion
10) Extensible

First Program of C Language:-
#include <stdio.h>
#include <conio.h>
void main(){
printf("Hello C Language");
getch();
}

Describe the C Program:-
 #include <stdio.h> includes the standard input
output library functions. The printf() function is defined in
stdio.h .
 #include <conio.h> includes the console input
output library functions. The getch() function is defined in
conio.h file.
 void main() The main() function is the entry point of
every program in c language. The void keyword specifies
that it returns no value.
 printf() The printf() function is used to print data on the
console.
 getch() The getch() function asks for a single
character. Until you press any key, it blocks the screen.

Output of Program is:-
Hello C Language

Input output function:-
 There are two input output function of c
language.
1) First is printf()
2) Second is scanf()
 printf() function is used for output. It prints the
given statement to the console.
 Syntax of printf() is given below:
 printf(“format string”,arguments_list);
 Format string can be %d(integer),
%c(character), %s(string), %f(float) etc.

scanf() Function: is used for input. It
reads the input data from console.
 scanf(“format string”,argument_list);
Note:-See more example of input-output
function on:-www.javatpoint.com/printf-scanf

Data types in C language:-
There are four types of data types in C
language.
Types Data Types
Basic Data Type int, char, float, double
Derived Data Type array, pointer, structure, union
Enumeration Data Type enum
Void Data Type void

Keywords in C Language:-
A keyword is a reserved word. You
cannot use it as a variable name, constant
name etc.
There are 32 keywords in C language as
given below:
auto break case char const continu
e
default do
double else enum extern float for goto if
int long register return short signed sizeof static
struct switch typedef union unsigned void volatile while

Operators in C language:-
 There are following types of operators to perform
different types of operations in C language.
1) Arithmetic Operators
2) Relational Operators
3) Shift Operators
4) Logical Operators
5) Bitwise Operators
6) Ternary or Conditional Operators
7) Assignment Operator
8) Misc Operator

Control statement in C language:-
1) if-else
2) switch
3) loops
4) do-while loop
5) while loop
6) for loop
7) break
8) continue

C if else statement:-
There are many ways to use if statement
in C language:
1) If statement
2) If-else statement
3) If else-if ladder
4) Nested if

if statement:-
 In if statement is used to execute the
code if condition is true.
syntax:-
if(expression){
//code to be execute
}

If else statement:-
The if-else statement is used to execute
the code if condition is true or false.
Syntax:
if(expression){
//code to be executed if condition is true
}else{
//code to be executed if condition is false
}

If else-if ladder Statement:-
The if else-if statement is used to execute one code from multiple conditions.
Syntax:
if(condition1){
//code to be executed if condition1 is true
}else if(condition2){
}
else if(condition3){
}
...
else{
//code to be executed if all the conditions are false
}

if else-if ladder Statement:-
 Syntax:
if(condition1){
}else if(condition2){
}
else if(condition3){
}
...
else{
//code to be executed if all the conditions are false
}

C Switch Statement:-
 Syntax:
switch(expression){
case value1:
//code to be executed;
break; //optional
case value2:
//code to be executed;
break; //optional
......
default:
code to be executed if all cases are not matched;
}

Loops in C language:-
Loops are used to execute a block of code
or a part of program of the program
several times.
Types of loops in C language:-
There are 3 types of loops in c language.
1) do while
2) while
3) for

do-while loop in C:-
 It is better if you have to execute the
code at least once.
Syntax:-
do{
//code to be executed
}while(condition);

while loop in c language:-
 It is better if number of iteration is not
known by the user.
Syntax:-
while(condition){
}

For loop in C language:-
 It is good if number of iteration is known
by the user.
Syntax:-
for(initialization;condition;incr/decr){
}

C break statement:-
 it is used to break the execution of loop
(while, do while and for) and switch case.
Syntax:-
jump-statement;
break;

Continue statement in C language:-
 it is used to continue the execution of loop
(while, do while and for). It is used with if
condition within the loop.
Syntax:-
jump-statement;
continue;
Note:- you can see the example of above
all control statements on
www.javatpoint.com/c-if else.

Functions in C language:-
To perform any task, we can create
function. A function can be called many
times. It provides modularity and
code reusability.
Advantage of function:-
1) Code Resuability
2) Code optimization

Syntax to declare function:-
return_type function_name(data_type para
meter...){
}
Syntax to call function:-
variable=function_name(arguments...);

Call by value in C language:-
In call by value, value being passed to the function is locally
stored by the function parameter in stack memory location.
If you change the value of function parameter, it is
changed for the current function only. It will not change the
value of variable inside the caller method such as main().

Example of call by value:-
#include <stdio.h>
#include <conio.h>
void change(int num) {
printf("Before adding value inside function num=%d n",num);
num=num+100;
printf("After adding value inside function num=%d n", num);
}
int main() {
int x=100;
clrscr();
printf("Before function call x=%d n", x);
change(x);//passing value in function
printf("After function call x=%d n", x);
getch();
return 0;
}

Output:-
Before function call x=100
 Before adding value inside function
num=100
After adding value inside function
num=200
After function call x=100

Call by reference in C:-
 In call by reference, original value is
modified because we pass reference
(address).

Example of call by Reference:-
#include <stdio.h>
#include <conio.h>
void change(int *num) {
printf("Before adding value inside function num=%d n",*num);
(*num) += 100;
printf("After adding value inside function num=%d n", *num);
}
int main() {
int x=100;
clrscr();
printf("Before function call x=%d n", x);
change(&x);//passing reference in function
printf("After function call x=%d n", x);
getch();
return 0;
}

Output:-
Before function call x=100
Before adding value inside function
num=100
After adding value inside function
num=200
After function call x=200

Recursion in C:-
 A function that calls itself, and doen't perform
any task after function call, is know as tail
recursion. In tail recursion, we generally call
the same function with return statement.
Syntax:-
recursionfunction(){
recursionfunction();//calling self function
}

Array in C:-
 Array in C language is a collection or group of
elements (data). All the elements of array
are homogeneous(similar). It has contiguous memory
location.
Declaration of array:-
 data_type array_name[array_size];
Eg:-
 int marks[7];
Types of array:-
1) 1-D Array
2) 2-D Array

Advantage of array:-
1) Code Optimization
2) Easy to traverse data
3) Easy to sort data
4) Random Access

2-D Array in C:-
2-d Array is represented in the form of
rows and columns, also known as matrix.
It is also known as array of arrays or list
of arrays.
Declaration of 2-d array:-
data_type array_name[size1][size2];

Initialization of 2-d array:-
int arr[3][4]={{1,2,3,4},{2,3,4,5},{3,4,
5,6}};

C Programming Language Tutorial for beginners - JavaTpoint

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