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# Variables and Datatypes with Type-Casting

The digital age has opened doors for several advancements in the manufacturing world. Developers these days are taking the help of computers to achieve precise development and programming plays an important role in this process. There are so many terms and symbols used in programming; here we are going to discuss a few of them to help you build a solid knowledge base.
A variable is basically a name given to some memory location or storage area in a program. In general terms, the variable can be defined as a container that carries some information. Whenever that particular information may be required, the programmer can simply use the name of that already declared variable to access that.
For instance, in order to create a variable; we can follow this declaration:
A = 87 # Declaring a variable to store an integer
B = 76.4 # Declaring a variable to store real number
Now, whenever we need to use 87 or 76.4; we can simply call variables A and B. It is also possible to overwrite the existing values of A and B.
In mathematical terms, the variable is defined as a symbol that can be used to store a value with the help of expression. This is a unique entity that can also change its value itself whenever needed.
In Java language, there are several types of variables; it basically links to the type of variable that we use; it can be a real number, an integer, a decimal value, or a name. In the programming world, the terms used to represent variables are float, int, String, Boolean, and char.
In order to declare a variable in Java language, programmers need to use the following format:
Datatype variableName = variableData ;
This is a generalized format for creating a variable. Using this format, if you need to create an integer variable, the format must be:
Int var1 = 45;
Sometimes a final keyword is added before the variable at the time of declaration which means that the value initialized at this stage cannot be overwritten. The format can be:
Final float PI = 28.325f;
Another famous language used for programming is Python and the variable names, in this case, can contain digits, alphabets, and underscores. A variable name can usually start only with an underscore and alphabet; it is not possible to start it with a digit. Moreover, no white spaces are allowed inside the variables. The best thing to know about the python language is that it can identify the data type automatically.
On the other side, there are two different types of Datatypes known as Non-Primitive Datatypes and Primitive Datatypes. The primitive datatypes consist of char, boolean, double, float, long, short, byte, and integer. The non-primitive datatypes represent Classes, Arrays, and Strings. These data types are known to have fixed size format as per their specific data types
Python is a popular language used for programming and typecasting. In this language, data types can have five different types as Integers that are represented with Int and help to store integers. The floating-point numbers are represented with the symbol float and they are used to store decimal point numbers. Strings are further represented with class str, and Booleans using class bool. None is used to describe nothing in the Python language.
All programming languages support typecasting. It is basically a way of changing one data type to another data type. There are so many functions that can be used to convert one type of data type into another type. For instance, the str() function allows programmers to convert some other variable or datatype into the string. Int() function on the other side allow users to convert other data types into an integer. Float() allow programmers to convert other data types into a floating-point number. Input() Function further allows users to get input from keyboards to the program in the form of string.
Other than programming, casting is also used in the manufacturing process.Investment casting is a widely used method for making complex-shaped components that need tighter tolerances with better surface finish and thinner walls. Investment casting is also used for designing molds that can be further used to design several titanium cast products. Investment casting is widely recommended by experts because it produces very precise components while minimizing subsequent matching, energy, and material waste. It is also useful to lead manufacturing of very intricate parts with higher precision.