Control Flow

Control flow statements support looping, branching and decision making tests which select the blocks of code to execute.

Pollen control flow statements will be familar to programmers who know C or Java.

Loops

For Loops

for (uint8 i = 0; i < 10; i++) {
  ...
}

These forms are also valid:

for (;;)                 { !-- an infinite loop --! }
for (j = 0; j < 10; j++) { !-- j has a default type of uint32 --!  }

While Loops

while (x < 10) {
  x++
}

Do-While

do {
  x++
} while (x < 10)

This form is also valid:

do {
  !-- 
      infinite loop. 
      note: terminating ';' is required. 
  --!
} while;

Conditional Statements

The decision making statements include if and switch.

If

if (x < 10) {
  x++
}

If Else

if (x < 10) { 
  x++
} else {
  x--
}

If Elif

if (x < 10) { 
  x++
} elif (x < 20) {
  x++
} else {
  x = 0
}

Switch

switch (x) {

  case 0: 
    break

  case 1:
    break

  default:
    break

}

Control Transfer Statements

Control transfer statements in Pollen include break, continue, and return.

Continue

The continue statement skips the rest of the current iteration of a loop.

Break

Break in a Loop Statement

The break statement exits any containing loops.

Break in a Switch Statement

The break statement exits the switch statement.

Return

The return statement terminates the execution of the currently executing function and returns control to the caller.