Variables

Variables in 'C' : 

• Variables are used to store a values in a program so that they can be used later. 
• We can also say variables are names given to memory location which holds some values. 
• Since 'C' is a compiled language it is strongly typed language meaning is we must declare variable in a program before it's use. 
• We can assign value to the variable either at a time of declaration or afterwards in a program. 
• Syntax for variable declaration is :

     data_type variable_name;
                    Or
      data_type variable_name=value;

• For example: 

        int a; or int a = 15;
Here we are declaring variable a of type integer indicates that a can hold only integer values.

• When we declare some variable compiler allocates memory for it and store its value at that location.
• Let's see program to print value and address of a variable 

#include<stdio.h>
int main()
{
  //declaration
    int num;
    num=45;
    printf("Value of num=%d",num);
    printf("Address of num is %d",&num);
    return 0;
}