Variable In C

Variable

Like any other programming language in C programming language, we use a variable to store value, a value is any data like a number a or a character. In this post, we will learn about datatype of C programming language.

Type Of Variable In C

In this section, we will discuss how to store the following type of variable in C

• How to store an integer in C?
• How to store a float in C?
• How to store a double in C?
• How to store a long in C?
• How to store a character in C?

As we already discussed that variable used to store data so that we can use it of other computation, for example, suppose we want to calculate the sum of two number then we have to store these two numbers first only after that we can use these two stored value to compute the sum. The entity that used to store a value called variable. What does it mean is suppose we tell a variable to store a number whose value is 5, the variable will place this number 5 in memory and we can variable instead of the number itself for computation. Let's understand this by our sum example

Calculate the sum of numbers 5 and 10?

One easy thing we can do is 5 + 10 and this will work but now if someone will ask you to calculate the multiplication of those numbers (5, 10). This there is a problem in calculating multiplication because the user is not providing number explicitly but saying to use the previous number that I had given. As a human, we know what was previous numbers because we have a brain and somehow these numbers stored in brain memory but a computer does not have a brain so we have to store these number in the computer memory. 

Again we will do the same problem Calculate the sum of numbers 5 and 10? this time we will use variable

First, we will store the first number in a variable let say first_number = 5

Now we will store the second number in another variable let say seconde_number = 10

then Calculate sum, 

Again We will store Sum in a variable lets called this sum so 

sum = first_number + second_number is same as 15 = 10 + 5 but now we have these numbers (5, 10, 15) are stored in variables(first_number, srecond_number, sum) we can these variable of other computation like calculate multiplication

multiplication = first_number x second_number

Declare Variable in C

In this section, we learn actual semantic that how to declare a variable in c programming language. In C programming, every variable has a data type that tells us what type of value a variable can store. So lets a very simple syntax to declare a variable is

DATA-TYPE VARIABLE-NAME;

here DATA-TYPE is data-type of the variable(int, char, float, double etc) a and variable name can be anything (var, var1, yourname, your_name etc).

How to store an integer in C?

We use keyword int to store an integer variable. you can declare a variable number that can store integer like

 #include <stdio.h>  
 int main()  
 {    
   int number;  
   return 0;  
 }  

Store a value 5 in the above variable. Change the above code like below in order to store the value in the variable

 #include <stdio.h>  
 int main()  
 {    
   int number;  
   number = 5;  
   return 0;  
 }  

You can declare a variable store value at a time like

 #include <stdio.h>  
 int main()  
 {    
   int number = 5;  
   return 0;  
 }  

How to store a float in C?

We use keyword float to store a float variable. you can declare a variable number that can store integer like

 #include <stdio.h>  
 int main()  
 {    
   float number;  
   return 0;  
 }  

Store a value 2.5 in the above variable. Change the above code like below in order to store the value in the variable

 #include <stdio.h>  
 int main()  
 {    
   float number;  
   number = 2.5;  
   return 0;  
 }  

You can declare a variable store value at a time like

 #include <stdio.h>  
 int main()  
 {    
   float number = 2.5;  
   return 0;  
 }  

How to store a double in C?

We use keyword double to store a double variable. you can declare a variable number that can store integer like

 #include <stdio.h>  
 int main()  
 {    
   double number;  
   return 0;  
 }  

Store a value 2.5 in the above variable. Change the above code like below in order to store the value in the variable

 #include <stdio.h>  
 int main()  
 {    
   double number;  
   number = 2.5;  
   return 0;  
 }  

You can declare a variable store value at a time like

 #include <stdio.h>  
 int main()  
 {    
   double number = 2.5;  
   return 0;  
 }  

How to store a long in C?

We use keyword long to store a long variable. you can declare a variable number that can store integer like

 #include <stdio.h>  
 int main()  
 {    
   long number;  
   return 0;  
 }  

Store a value 50000000 in the above variable. Change the above code like below in order to store the value in the variable

 #include <stdio.h>  
 int main()  
 {    
   long number;  
   number = 50000000;  
   return 0;  
 }  

You can declare a variable store value at a time like

 #include <stdio.h>  
 int main()  
 {    
   long number = 50000000;  
   return 0;  
 }  

How to store a character in C?

We use keyword char to store a character variable. you can declare a variable number that can store a character like

 #include <stdio.h>  
 int main()  
 {    
   char chr;  
   return 0;  
 }  

Store a value 5 in the above variable. Change the above code like below in order to store the value in the variable

 #include <stdio.h>  
 int main()  
 {    
   char chr;  
   chr = 'A';  
   return 0;  
 }  

You can declare a variable store value at a time like

 #include <stdio.h>  
 int main()  
 {    
   char chr = 'A';  
   return 0;  
 }  

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