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// This file is part of www.nand2tetris.org
// and the book "The Elements of Computing Systems"
// by Nisan and Schocken, MIT Press.
// File name: projects/12/Sys.jack
/**
* A library that supports various program execution services.
*/
class Sys {
/** Performs all the initializations required by the OS. */
function void init() {
do Array.init();
do Keyboard.init();
do Math.init();
do Memory.init();
do Output.init();
do Screen.init();
do String.init();
do Main.main();
}
/** Halts the program execution. */
function void halt() {
while (true){
}
return;
}
/** Waits approximately duration milliseconds and returns. */
function void wait(int duration) {
Output.printString("waiting")
let i = 0;
while (i < 50000){
let i = i + 1;
}
Output.printString("done")
}
/** Displays the given error code in the form "ERR<errorCode>",
* and halts the program's execution. */
function void error(int errorCode) {
Output.printString("ERR");
Output.printInt(errorCode);
}
}
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