What does an IF Statement do?

Answer 1

An if statement is a control statement. It is used to control whether a statement executes or not, depending on whether a control expression evaluates true or false.

if (expression) {

statement;

}

In the above example, the expression is evaluated. If true, the statement executes, otherwise it does not.

if (expression) {

statement1;

} else {

statement2;

}

In the above example, the expression is evaluated. If true, statement1 executes otherwise statement2 executes.

Note that if statements may be chained together using else if statements. The final else clause (if present) then becomes the default case. Also, any statement within an if statement may itself be an if statement, known as a nested if. If statements may be chained or nested to any depth.