5. Data Types in C

 

Data Types in C

A data type specifies the type of data that a variable can store such as integer, floating, character, etc.
There are the following data types in C language.

Types	Data Types
Basic Data Type	int, char, float, double
Derived Data Type	array, pointer, structure, union
Enumeration Data Type	enum
Void Data Type	void

The basic data types are integer-based and floating-point based.The memory size of the basic data types may change according to 32 or 64-bit operating system.
C has a built-in sizeof operator that gives the memory requirements for a particular data type.

Program for displaying the size of various data types

#include <stdio.h>

int main()
{
   printf("int : %ld bytes\n", sizeof(int));
   printf("float : %ld bytes\n", sizeof(float));
   printf("double : %ld bytes\n", sizeof(double));
   printf("char : %ld bytes\n", sizeof(char));
   return 0;
}

Output according to 64-bit architecture :

int : 4 bytes
float : 4 bytes
double : 8 bytes
char : 1 bytes

Output according to 32-bit architecture :

int : 2 bytes
float : 4 bytes
double : 8 bytes
char : 1 bytes

The program output displays the corresponding size in bytes for each data type.