Data Types In C With Real Life Example

Data Types:

• Data types are an important attribute of an identifier in any language because all operations are type checked by compiler for the compatibility.
  
  
• Data type determines all the possible values that an identifier can have and valid operations that can be applied on it. Illegal operations will not compile by compiler.

C language has the following categories:

Primitive / Basic Data Types

• Character (Char)
• Integer (Int)
• Single Precision Floating Point (Float)
• Double Precision Floating Point (Double)
• No value Available (Void)

Derived Data Types

• Array Types
• Pointer Type
• Function Types

User Defined Data Types

• Structure
• Union
• Enumeration

Data types & their memory requirements:

SR	Data Types	Memory in Bytes
1	char	1 Byte
2	int	2 Byte
3	float	4 Bytes
4	double	8 Bytes
5	signed	Same as data types 1, 2
6	Unsigned	Same as data types 1, 2
7	short int	2 Bytes
8	long int	4 Bytes
9	long float	8 Bytes
10	long double	10 Bytes

Format Specifiers in C Language

S.No	Data Type	X	Format Specifies	Remark
1	Char	C	%c	Single character
2	Int	I	%i	Signed Integer
3	Int	D	%d	Signed Integer in decimal number system
4	unsigned int	O	%o	Signed integer in octal number system
5	unsigned int	u	%u	Signed integer in decimal number system
6	unsigned int	X	%x	Signed integer in hexadecimal number system
7	unsigned int	X	%X	Signed integer in hexadecimal number system
8	long int	Id	%%Id	Signed long
9	short int	Hd	$hd	Signed short
10	unsigned long	Lu	%lu	Unsigned long
11	unsigned short	Hu	%hu	Unsigned short
12	float	F	%f	Signed precision float
13	Double	Lf	%If	Signed double precision float
14	String type	S	%s	String
15	Pointer type	P	%p	Pointer

Program

#include<stdio.h>
#include<conio.h>
main()
{
   printf("********* size of various data types *********\n");
   printf("\n character takes %d bytes in memory \n", sizeof(char));
   printf("\n integer takes %d bytes in memory \n",sizeof(int));
   printf("\n float takes %d bytes in memory \n",sizeof(float));
   printf("\n double takes %d bytes in memory \n",sizeof(double));
   getch();
}

Output



Real life example

Suppose if we are giving any interview then let say interviewer ask the following questions:



Question: What is your designation in your current company?

Answer: Software Developer

In the above scenario whenever we think about answer, we decide the data type of our answer like it will be character string.

Question: What is your current CTC?

Answer: x Lac

In the above scenario whenever we think about answer, we decide data type of our answer like it will be in numbers (can be integer or float).

Summary

This article will help fresher candidates to understand Data Types in C with real life example.

Hope you enjoyed this one.