Learn data types of c++ at TCCI, Ahmedabad

In programming Language user have to store data into the variable, variable is nothing but memory location where we store the data. Variable can store only one data at a time. We can also update this value by processing.

As we know data can be any type means simple number or real number, it may be character data also, when user is doing programming, may be user know the type of data, but computer (machine) can’t differentiate this types, so during programming coder has to differentiate this types of data, so when compiler compile the source code, it can differentiate the data as per their types.

In programme initial part is declaration part of data. Variable declaration should be done with its data types, Data types is not useful only for differentiate data but also compiler can allocate memory as per types, Because in programming language data are categorized as per types, and they all have different  size and range allocated. As per their type memory is allocated and value which input to variable it’s also as per this type.

This size may be vary machine to machine or programming language.

Let us see in detail these data types in c++ language.

Data Type	Memory (ByteS)	Minimum Value	Maximum Value
Bool	1	Logical Value T/F	Logical Value T/F
Char	1	-128	127
Unsigned Char	1	0	255
Short	2	-32768	32767
Unsigned Short	2	0	65535
int	2	-32768	32767
unsigned int	2	0	65535
Long	4	-2147483648	2147483647
unsigned long	4	0	4294967295
float	4	10-38	1038
double	8	10-308	10308
long double	10	10-4932	104932

C++ offers a predefined data type that is one byte in size, which can hold exactly one character such as ‘a’ or ‘A’. To declare a variable of type char, we have

Char ch;

Suppose we want to store a character value ‘a’, in a char data type ch, it is enclosed within a single quote.

Ch = ‘a’;

Actually character has 4 sub category,

0 to 9 digit

A to Z

ato z

any symbol

Suppose we want to store 0to 9 digit then integer type is used,

I.e. int a=123;

Int occupies 2 bytes but if we require long memory then we can use.

If data are real number, then use float data type.

Float a=78.234;

Also float has long double, which can use for long memory requirement.

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