Loop structures

AppleScript

repeat-until

set i to 5
repeat until i is less than 0
	set i to i - 1
end repeat

repeat
	--endless loop
end repeat

C

while

Compiler: GCC 4.1.2

int main (int argc, char ** argv) {
  int condition = 1;

  while ( condition ) {
    // Do something
    // Don't forget to change the value of condition.
    // If it remains nonzero, we'll have an infinite loop.
  }
}

do-while

Compiler: GCC 4.1.2

int main (void) {
  int condition = 1;

  do {
    // Do something
    // Don't forget to change the value of condition.
    // If it remains nonzero, we'll have an infinite loop.
  } while ( condition );
}