Data types in c refer to an extensive system used for declaring
variables or functions of different types. The type of a variable
determines how much space it occupies in storage and how the bit pattern
stored is interpreted.
The types in C can be classified as follows −
The array types and structure types are referred collectively as the
aggregate types. The type of a function specifies the type of the
function's return value. We will see the basic types in the following
section, where as other types will be covered in the upcoming chapters.
To get the exact size of a type or a variable on a particular platform, you can use the sizeof operator. The expressions sizeof(type) yields the storage size of the object or type in bytes. Given below is an example to get the size of int type on any machine −
The header file float.h defines macros that allow you to use these
values and other details about the binary representation of real numbers
in your programs. The following example prints the storage space taken
by a float type and its range values −
The types in C can be classified as follows −
S.N. | Types & Description |
---|---|
1 | Basic Types They are arithmetic types and are further classified into: (a) integer types and (b) floating-point types. |
2 | Enumerated types They are again arithmetic types and they are used to define variables that can only assign certain discrete integer values throughout the program. |
3 | The type void The type specifier void indicates that no value is available. |
4 | Derived types They include (a) Pointer types, (b) Array types, (c) Structure types, (d) Union types and (e) Function types. |
Integer Types
The following table provides the details of standard integer types with their storage sizes and value ranges −Type | Storage size | Value range |
---|---|---|
char | 1 byte | -128 to 127 or 0 to 255 |
unsigned char | 1 byte | 0 to 255 |
signed char | 1 byte | -128 to 127 |
int | 2 or 4 bytes | -32,768 to 32,767 or -2,147,483,648 to 2,147,483,647 |
unsigned int | 2 or 4 bytes | 0 to 65,535 or 0 to 4,294,967,295 |
short | 2 bytes | -32,768 to 32,767 |
unsigned short | 2 bytes | 0 to 65,535 |
long | 4 bytes | -2,147,483,648 to 2,147,483,647 |
unsigned long | 4 bytes | 0 to 4,294,967,295 |
#include <stdio.h> #include <limits.h> int main() { printf("Storage size for int : %d \n", sizeof(int)); return 0; }When you compile and execute the above program, it produces the following result on Linux −
Storage size for int : 4
Floating-Point Types
The following table provide the details of standard floating-point types with storage sizes and value ranges and their precision −Type | Storage size | Value range | Precision |
---|---|---|---|
float | 4 byte | 1.2E-38 to 3.4E+38 | 6 decimal places |
double | 8 byte | 2.3E-308 to 1.7E+308 | 15 decimal places |
long double | 10 byte | 3.4E-4932 to 1.1E+4932 | 19 decimal places |
#include <stdio.h> #include <float.h> int main() { printf("Storage size for float : %d \n", sizeof(float)); printf("Minimum float positive value: %E\n", FLT_MIN ); printf("Maximum float positive value: %E\n", FLT_MAX ); printf("Precision value: %d\n", FLT_DIG ); return 0; }When you compile and execute the above program, it produces the following result on Linux −
Storage size for float : 4 Minimum float positive value: 1.175494E-38 Maximum float positive value: 3.402823E+38 Precision value: 6
The void Type
The void type specifies that no value is available. It is used in three kinds of situations −S.N. | Types & Description |
---|---|
1 | Function returns as void There are various functions in C which do not return any value or you can say they return void. A function with no return value has the return type as void. For example, void exit (int status); |
2 | Function arguments as void There are various functions in C which do not accept any parameter. A function with no parameter can accept a void. For example, int rand(void); |
3 | Pointers to void A pointer of type void * represents the address of an object, but not its type. For example, a memory allocation function void *malloc( size_t size ); returns a pointer to void which can be casted to any data type. |
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