A conditional statement is a construct that, when executed, chooses from a group of enclosed statements according to the value of an expression, and executes them. The if statement has the form:

selection-statement

if ( expression ) statement

if ( expression ) statement else statement

The expression is interpreted as a condition. When executed, the condition is evaluated. If it is non-zero (true), the first enclosed statement is executed; otherwise, the second is executed. The else branch can be omitted, if nothing needs to be done when the condition is false.

if statements can be chained together if more than two branches or conditions are required:

if (condition)
  statement
else if (condition)
  statement
else if (condition)
  statement
else
  statement

An alternative to this might be to use switch.

If you need more than one statement in a branch, you can make it a block statement:

if (condition) {
  . . .
} else {
  . . .
}