C if...else Statement
The if statement may have an optional else block. The syntax of the if..else statement is:

if (test expression) {
// statements to be executed if the test expression is true
}
else {
// statements to be executed if the test expression is false
}

How if...else statement works?
If the test expression is evaluated to true,

statements inside the body of if are executed.
statements inside the body of else are skipped from execution.
If the test expression is evaluated to false,

statements inside the body of else are executed
statements inside the body of if are skipped from execution.

Check whether an integer is odd or even