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Data types in C:
C has different types of data types. The data type is determines how much space is occupied by variable in the storage disk.
Mainly there are two types those are Pre- defined and User Defined.
Basic data types: These are arithmetic data types Integer, Char, float and Double.
Enumerated Type: enum is the arithmetic type used to define variables used to assign certain discrete integer values throughout the program.
Void data type: Void means no value.
Derived Data types: Derived data type means these are defined by the programmer at the time of programming based on the requirement.
Arrays, pointers, structures and union.
Data Types in C:
| Data Types | Size | Range |
| Char | 1 byte | −128 to 127 |
| signed char | 1 byte | −128 to 127 |
| unsigned char | 1 byte | 0 to 127 |
| Short | 2 byte | −32,768 to 32,767 |
| signed short | 2 byte | −32,768 to 32,767 |
| unsigned short | 2 byte | 0 to 32,767 |
| Int | 2 byte | −32,768 to 32,767 |
| signed int | 2 byte | −32,768 to 32,767 |
| unsigned int | 2 byte | 0 to 32,767 |
| short int | 2 byte | −32,768 to 32,767 |
| signed short int | 2 byte | −32,768 to 32,767 |
| unsigned short int | 2 byte | 0 to 32,767 |
| long int | 4 byte | |
| signed long int | 4 byte | |
| unsigned long int | 4 byte | |
| Float | 4 byte | |
| Double | 8 byte | |
| long double | 10 byte |
The above shows the basic data types in c.
Note: If you want to know the exact size of the variable or a type use sizeof() operator .
Below program demonstrates how to use sizeof() operator in c and know the values of basic data types.
This is basic interview question for fresher use of sizeof() operator.
#include<stdio.h>
#include<conio.h>
void main(){
printf(“size of an integer: %d \n”,sizeof(int));
printf(“size of float: %d \n”,sizeof(float));
printf(“size of Character: %d \n”,sizeof(char));
printf(“size of double: %d \n”,sizeof(double));
getch();
}
Output is :
size of an integer:2
size of float: 4
size of Character:1
size of double: 8
Press Alt +f9 and then Ctrl+f9 to compile and run the program.
Out put of the above program is:
