Variables and Data types in C

Variables and Data types in C :

Variables and Data types in C are most important.we will learn Variables and Data types in C in this tutorial.

Variables in C :

  • Variables are anything such as persons name, address, number etc.
  • Definition – Variables in C is the name given to the memory location.
  • Any data in C are stored into the memory and we can identify that location by its name that is we address that memory location is referred as Variables.
  • Usually in C, We first declared the Variables.
  • But as we storing the variables ,it can be of any type therefore we also have to mention the type of that variable as follow:

Data types in C :

  • A datatype specifies the type of which variables holds the data.
  • In C , their are various types of data type as integer , float ,double,character etc.
  • Integer data type : This data type holds integer type of data.
  • Float data type : This data type holds Floating type of data.
  • Char data type : This data type holds character type of data.

Using  theses data types we declare the variables.

  • In C , Variables declaration be the first statement of the program.

Example :

123456789int a b;      //global variables.void main(){int c;    //local variable.}

As shown above we declared 3 variables as a , b, c which holds integer type of data.

  •  Global variables : The global variables are the variables which are declared outside of the function at the top of the program.
  • The global variables can be accessed any where in program.

Example :

123456789int var1;     // global variable declarationvoid main(){var1=10;      //accessing the global variable}
  • Local variables : The local variables are the variables which are declared inside the functions.
  • The local variables can not accessed outside of the function.

Example :

1234567void main(){var1=10; //local variable declaration}

Rules for variable declaration :

  • Variable name must start with alphabet or underscore.
  • Variable name can not start with number or any special symbol.
  • No space is allowed in between the variable name declaration.
  • No special character is allowed.
    C1234567891011121314151617181920//program to illustrate variable and datatype.#include<stdio.h>int var1;void main(){    int var2;    char ch;    var1=10;    var2=20;    char=’a’;     printf(“global variable with the data type int=:%d”,var1);     printf(“local variable with the data type int=:%d”,var2);     printf(“local variable with the data type char=:%c”,var3);}Output :global variable with the data type int=:10local variable with the data type int=:20local variable with the data type char=:a

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