{ }

In C programming, curly braces { } are used to denote a block of statements. It also indicates the start and end of a function and a structure.

main()

main() is the special function in C, where from execution of a program starts and ends. And main() function is returns the status of a program to the Parent process, showing the success or failure of the program.

/* Comment */

A comment starts with set of two character /* (slash, asterisk) and ends with set of two characters */ (asterisk, slash). That means between these characters sets you can write a comment (whatever you want to write - related to the program)

float

Float is a term used in several programming languages to define a variable with a fractional value. using a floating variable declaration will have digits on both sides of a decimal point.

&&

The conditional AND operator (&&) is used to perform a logical AND of its Boolean operands. ...)

return

In C language "return" statement terminates the execution of a function and returns control to the calling function. A return statement can also return a value to the calling function.

==

= is an Assignment Operator it is used to assign the value of variable or expression, while == is an Equal to Operator and it is a relation operator used for comparison (to compare value of both left and right side operands).

%d

"%d" is used as a format identifier for int data type.

%c

A char variable can be used to store a single character."%c" is used as a format identifier for character data type.

stdio.h

The header file stdio.h (Standard input / output) should must included at top of the program. It allows to interact with console.