An operator in C can be defined as the symbol that helps us to perform some specific mathematical, relational, bitwise, conditional, or logical computations on values and variables. The values and variables used with operators are called operands. So we can say that the operators are the symbols that perform operations on operands.
A function in C is a set of statements that when called perform some specific task. It is the basic building block of a C program that provides modularity and code reusability. The programming statements of a function are enclosed within { } braces, having certain meanings and performing certain operations. They are also called subroutines or procedures
The names for Variables in C can only have letters, an alphabet, a number, or an underscore in the first position. No variable in C should ever start with a special character, space, or other than a number, alphabet, or underscore. No keywords will be considered as a variable.