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Operators: An operator is a symbol that tells the computer to perform predefined mathematical or logical manipulations.
Types of operators:
1) Arithmetic Operators: It includes all the basic arithmetic operators (+, -, *, /, %).
2) Relational Operators: Its use is for comparing two quantities (<, <=, >, >=, ==, !=).
3) Logical Operators: Its use is when we want to test more than one condition and make a decision (&&, ||, !).
4) Assignment Operators: Its use is to assign the result of an expression to a variable (=).
5) Increment & Decrement Operators: These are unary operators (++, --).
6) Conditional Operators: A ternary operator pair (expression1 ? expression2 : expression3).
7) Bitwise Operators: Its use is to manipulate the data at the bit level. The operator is used to test the bits or shift them right or left (&, |, ^, <<, >>).
8) Special Operators: comma operator (,), sizeof operator, pointer (&, *), member selection operator (., ->) and pre-processor (#, ##).
Expressions: An expression is a sequence of operands and operators that reduce to a single value.
Arithmetic expressions: It is a combination of variables, constants and operators.
Rules of evaluation of expression:
1) Parenthesized sun-expression from left to right evaluated.
2) If parentheses are nested, the evaluation begins with the innermost sub-expression.
3) Associativity rule is applied when two or more operators of the same precedence level appear in a sub-expression.
4) Arithmetic expressions are evaluated from left to right using the rule of precedence.
5) When parentheses use, the expression within is assumed as the highest priority.
Some computational program:
1) Division by zero: That can give abnormal termination of the program. The programmer should take care of the denominator and avoid the division by zero.
2) Avoid overflow & underflow: It is the responsibility to make sure that operands are correct types and ranges.
Type conversions in expressions:
1) Implicit type conversion: C automatically converts any intermediate values to the proper type so that the expression can evaluate without losing any significance.
2) Explicit type conversion: local conversion of value.
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