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What is Data Type and Why Data Type Need?

What is Data Type and Why Data Type Need?

In programming there are different types of data used for example 987, 876.34, xyz, Hello World, %, # etc.

As a human being we can differentiate that these all data are different but machine can't differentiate data, so, to differentiate data they have been categorized in different categories which are called data type.

ANSI C provides three types of data types:

1.      Primary (Built-in) DataTypes: void, int, char, double and float.

2.      Derived DataTypes: Array, References, and Pointers.

3.      User Defined DataTypes: Structure, Union, and Enumeration.

 1. Following are Primary Data Types in C:

·         void - means nothing. void is always used with main function. That mean void function does not return any value.

·         int -  0-9 digit (combination)   i.e. 99999 , 10 , 0 , 23456

·         float - Real Number  i.e 78.91

·         char -There are 4 sub categories:  

o   0-9

o   a-z

o   A-Z

o   other symbols

·         Note: character contains only single value

·         string - Is collection of character but C language does not allow to declare string as a data type.

 Data Type is always used in variable declaration in beginning in void main.

data type name;

For example,

int rollno;

float salary;

char code;

2. Following are Derived Data Types in C:

Derived Data type is based on Primary data type.

Arrays - Arrays are sequences of data items having homogeneous values.

References - Function pointers allow referencing functions with a particular signature.

Pointers - These are powerful C features which are used to access the memory address

 3. Following are User Defined Data Types in C:

C allows the feature called type definition which allows programmers to define their identifier that would represent an existing data type. There are three such types:

·         Structure

It is a package of variables of different types under a single name. This is done to handle data efficiently. "struct" keyword is used to define a structure.

·         Union

These allow storing various data types in the same memory location. Programmers can define a union with different members, but only a single member can contain a value at a given time.

·         Enum

Enumeration is a special data type that consists of integral constants, and each of them is assigned with a specific name. "enum" keyword is used to define the enumerated data type.

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What is Data Type and Why Data Type Need?

In programming there are different types of data used for example 987,876.34, xyz, Hello World, %, # etc.

As a human being we can differentiate that these all data are different but machine can’t differentiate data, so, to differentiate data they have been categorized in different categories which are called data type.

ANSI C provides three types of data…

What is Loop in Programming?

What is Loop in Programming?

To write once, but execute more than one time is called Loop in Programming. This will save time of developer to write n time.

3 type of Loop:

à        for

à        while

à        do-while

We see one by one in detail.

There are 3 sections in each loop:

there  is  loop variable i/j

1. initialization   i=1 or i=10

2. condn  check i<=10  or i>=1

3. update (++ or --) i=i+1  or i++   i--

e.x. We want to print 10 time "hello world". Then what is the syntax in coding?

Let us see.

1.     for  loop

for (i=1;i<=10;i++)

{          

Printf ("hello world\n");    

}

Here, all 3 sections are in same statement. First initialization executed always. Then control goes to the condition checking. If condition is true then only control entered  into the loop and statement inside the loop will be executed. Then control goes to the updating, again condition checking  , and same process will continue until condition will be false.

2.     While Loop

i=1; while(i<=10)

{            printf ("hello wolrd\n");

           i++;

}

Here , initialization is outside of Loop. Then control goes to the condition checking. If condition is true then only control entered into the loop and statement inside the loop will be executed. Then control goes to the updating, again condition checking , and same process will continue until condition will be false.

3. do -while Loop

i=1;

do

{            printf ("hello wolrd\n");

           i++;

} while (i>=10);

Here, also initialization is outside of Loop. But in this Loop condition is last , so control direct enter into the loop and one time statement inside the loop will be executed. Then updating and last control rich to the condition checking. If condition is true then control again entered into the  loop , and process will be continue until condition will be false.

Thus , Do - While loop is different than previous two loop. Here condition is last , so , if condition is false yet output will execute one time. When in previous two  loop condition is false then output will not execute once.

Second difference is : in do-while there is semi colon at last.

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Loop in C Language – tccicomputercoaching.com

What is Loop in Programming?

To write once, but execute more than one time is called Loop in Programming. This will save time of developer to write n time.

3 type of Loop:

for

while

do-while

We see one by one in detail.

There are 3 sections in each loop:

there is loop variable i/j

1. initialization i=1 or i=10

2. condn check i<=10 or i>=1

3. update (++ or –) i=i+1 or i++ i–

e.x. We want to print…