Variables are used to store information to be referenced and manipulated in a computer program. They also provide a way of labeling data with a descriptive name, so our programs can be understood more clearly by the reader and ourselves. It is helpful to think of variables as containers that hold information. Their sole purpose is to label and store data in memory. This data can then be used throughout your program.

Interpreter is a program that executes instructions written in a high-level language. There are two ways to run programs written in a high-level language. The most common is to compile the program; the other method is to pass the program through an interpreter.

Time complexity of an algorithm signifies the total time required by the program to run till its completion.

The time complexity of algorithms is most commonly expressed using the big O notation. It's an asymptotic notation to represent the time complexity. We will study about it in detail in the next tutorial.

Time Complexity is most commonly estimated by counting the number of elementary steps performed by any algorithm to finish execution. Like in the example above, for the first code the loop will run nnumber of times, so the time complexity will be n atleast and as the value of n will increase the time taken will also increase. While for the second code, time complexity is constant, because it will never be dependent on the value of n, it will always give the result in 1 step.

And since the algorithm's performance may vary with different types of input data, hence for an algorithm we usually use the worst-case Time complexity of an algorithm because that is the maximum time taken for any input size.

If any operator is used on three operands or variable is known as Ternary Operator. It can be represented with ? : . It is also called as conditional operator

• Using ?: reduce the number of line codes and improve the performance of application.
• Syntax

               expression-1 ? expression-2 : expression-3

In the above symbol expression-1 is condition and expression-2 and expression-3 will be either value or variable or statement or any mathematical expression. If condition will be true expression-2 will be execute otherwise expression-3 will be executed.

• Example

a<b ? printf("a is less") : printf("a is greater");

Arithmetical operators are functions that take numbers as arguments and map onto a new number.

example: /,*,+,*,%,=,++,--

Logical operators are functions that take propositions (or whatever that can have only two different values, such as ‘true’ or ‘false’) and map them onto either one of those values. So the domain only contains two different things (typically ‘true’ and ‘false’).

example: &&,||, ! ..(AND/OR/NOT)

“If-else” and “switch” both are selection statements. The selection statements, transfer the flow of the program to the particular block of statements based upon whether the condition is “true” or “false”. The fundamental difference between if-else and switch statements is that the if-else statement “selects the execution of the statements based upon the evaluation of the expression in if statements”. The switch statements “selects the execution of the statement often based on a keyboard command”.

if (expression){

statement(s)

}

else{

statement(s)

}

Would MCA be the right step or are there better options for me ?