Datatypes in C: Size and Range with Program

Datatypes:

     Datatype of a variable specifies what type of data that is going to store in a variable and the amount of memory required (allocated) to store that variable. Datatypes are used to declare the variables i.e., intimate the compiler about a variable before using it in the program.

Previous Topic:

Variables

Basic Datatypes in C:

     Basic or primitive data types in C programming are
            int           - For storing integer values
           float         - For storing real numbers
           char         - For storing a character
           long         - For storing integers (High range)
           double     - For storing real numbers(High Range)

Range of a datatype depends on the amount of memory allocated for a particular datatype. As C is a platform dependent language, memory allocated for each datatype depends on the compiler.We can  know the amount of memory allocated for datatype by using sizeof operator.

char gets 1 byte of memory so range of char is -128 to 127
If 'n' bits are allocated for a variable then its range is from  -2^n-1 to 2^n-1-1
There are some complex types in C such as structures,unions......

Program to know size of each Datatype:

#include<stdio.h>
void main()
 {
   printf("Memory allocated for int is %d bytes\n",sizeof(int));
   printf("Memory allocated for float is %d bytes\n",sizeof(float));
   printf("Memory allocated for char is %d bytes\n",sizeof(char));
   printf("Memory allocated for double is %d bytes\n",sizeof(double));
   printf("Memory allocated for long is %d bytes\n",sizeof(long));
   printf("Memory allocated for short is %d bytes\n",sizeof(short));
 }

Output:

Related Topics:

Variables 

ASCII codes for different keys

Next Topic:

Constants in C Language

Share on Google Plus