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"use strict";
// replace_with_your_name - Lab 2 js file.
/** @global {boolean} */ let calculatorOn; // Remember if the calculator is on or off.
/** @global {string} */ let currentNumberEntered; // The current number entered and shown in the display.
/** @global {string} */ let memoryStore; // Used for MRC/M-/M+ buttons.
/** @global {string} */ let operationClicked; // The operation [%+x-÷] that was clicked.
/** @global {string} */ let previousAreaClicked; // The previous area that was clicked.
/** @global {string} */ let previousNumberEntered; // The previous number entered.
/** @global {string} */ let previousOperand_2; // The previous second operand. Used for following on = calculations.
function _Initialize() {
turnCalculatorOff();
turnCalculatorOn();
}
/**
* Add the value of the button to the display.
*
* @param {string} numberClicked The value of the button that was clicked.
*/
function addKeyToCurrentNumberEntered(numberClicked) {
if (Number(currentNumberEntered)) {
currentNumberEntered += numberClicked;
} else {
currentNumberEntered = numberClicked;
}
} // END addKeyToCurrentNumberEntered.
/**
* Get the calculator display value.
*
* @return {string} The current display string.
*/
function getDisplay() {
return document.getElementById('calculatorDisplay').innerText;
} // END getDisplay.
/**
* Perform the calculator button function.
*
* @param {object} e - The area that was clicked on.
* @return (false) Stops the area href from being opened.
*/
function performCalculatorButton(e) {
let btnClicked = e.title;
console.log(`performCalculatorButton[] btnClicked = ${btnClicked}`);
if (calculatorOn) { // Is the calculator on?
switch (btnClicked) { // switch btnClicked.
case '00':
console.log(`currentNumberEntered = [${currentNumberEntered}]`);
if (currentNumberEntered == '' || currentNumberEntered == '0') {
btnClicked = '0';
}
console.log(`btnClicked changed to [${btnClicked}]`);
case '.':
if (btnClicked === '.' && getDisplay().indexOf('.') !== -1) {
break;
}
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
addKeyToCurrentNumberEntered(btnClicked);
setDisplay(currentNumberEntered);
break;
case 'on':
if (calculatorOn) {
turnCalculatorOff();
}
break;
case 'x':
case '/':
if ( previousAreaClicked !== '=') {
previousNumberEntered = currentNumberEntered;
}
currentNumberEntered = '';
operationClicked = btnClicked;
console.log(`operationClicked = [${operationClicked}]`);
setDisplay(btnClicked);
break;
case '=':
/** @global {string} WIll store the result of the calculation. */
let result;
console.log(`previousNumberEntered = ${previousNumberEntered}, currentNumberEntered = ${currentNumberEntered}`);
console.log(`operationClicked = ${operationClicked}, previousOperand_2 = ${previousOperand_2}`);
if ( previousAreaClicked === '=') {
if (previousOperand_2 !== '' && currentNumberEntered === '') {
currentNumberEntered = previousOperand_2;
console.log(`currentNumberEntered changed to ${currentNumberEntered}`);
}
} else {
currentNumberEntered = previousNumberEntered;
console.log(`currentNumberEntered changed to ${currentNumberEntered}`);
}
console.log(`Calculate: ${Number(previousNumberEntered)} ${operationClicked} ${Number(currentNumberEntered)}`);
switch (operationClicked) {
case 'x':
result = Number(previousNumberEntered) * Number(currentNumberEntered);
break;
case '/':
result = Number(previousNumberEntered) / Number(currentNumberEntered);
break;
default:
console.log(`Operation ${operationClicked} not programmed.`);
}
let displayResult = result.toString();
previousOperand_2 = currentNumberEntered;
previousNumberEntered = displayResult;
console.log(`result = ${displayResult}`);
setDisplay(result);
//resetCalculator();
currentNumberEntered = '';
break;
default:
console.log(`${btnClicked} not programmed.`);
} // switch btnClicked.
previousAreaClicked = btnClicked;
} else { // Is the calculator on?
if (btnClicked === 'on') {
turnCalculatorOn();
}
} // Is the calculator on?
return false;
} // END performCalculatorButton.
/**
* Reset the calculator global variables.
*/
function resetCalculator() {
currentNumberEntered = '';
memoryStore = '0';
operationClicked = '';
previousAreaClicked = '';
previousNumberEntered = '0';
previousOperand_2 = '';
} // END resetCalculator.
/**
* Turn off the calculator.
*/
function turnCalculatorOff() {
console.log('turnCalculatorOff[]');
calculatorOn = false;
document.getElementById('calculatorDisplay').style.backgroundColor = 'black';
} // END turnCalculatorOff.
/**
* Turn on and reset the calculator.
*/
function turnCalculatorOn() {
console.log('turnCalculatorOn[]');
calculatorOn = true;
resetCalculator();
setDisplay('0');
document.getElementById('calculatorDisplay').style.backgroundColor = 'silver';
} // END turnCalculatorOn.
/**
* Set the calculator display value.
*
* @param {string} displayValue - The value to display.
*/
function setDisplay(displayValue) {
document.getElementById('calculatorDisplay').innerText = displayValue;
} // END setDisplay.