calculator/calculator.js at main · amansharma11981/calculator · GitHub

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const buttonValues = [
    "AC", "+/-", "%", "/",
    "7", "8", "9", "*",
    "4", "5", "6", "-",
    "1", "2", "3", "+",
    "00","0", ".", "="
];
const rightSymbols = ["/", "*", "-", "+", "="];
const topSymbols = ["AC", "+/-", "%"];

const display = document.getElementById("display");

//A+B,A*B,A-B,A/B
let A = 90;
let operator = null;
let B = null;
function clearAll() {
    A = 0;
    operator = null;
    B = null;
    display.value = "";

};


for (let i = 0; i < buttonValues.length; i++) {
    let value = buttonValues[i];
    let button = document.createElement("button");
    button.innerText = value;

    //style button colour

    if (rightSymbols.includes(value))
    {
       button.style.backgroundColor = "#ff9500"; //orange for right symbols
    }
    else if (topSymbols.includes(value))
    {
        button.style.backgroundColor = "#f8f6f6ff"; //grey for left symbols
        button.style.color = "black";
    }

    //process button click
    button.addEventListener("click", function()
    {
        if (rightSymbols.includes(value))
        {
            if (value == "=")
            {
                if(value != null)
                {
                    B = display.value;
                    let numA = Number(A);
                    let numB = Number(B);

                    if(operator == "/")
                    {
                    display.value = numA / numB;
                    }
                    else if(operator == "*")
                    {
                    display.value = numA * numB;
                    }
                    else if(operator == "-")
                    {
                    display.value = numA - numB;
                    }
                    else if(operator == "+")
                    {
                    display.value = numA + numB;
                    }
                }
            }
            else
            {
                operator = value;
                A = display.value;
                display.value = "";
            }

        }
        else if (topSymbols.includes(value))
        {
            if(value == "AC")
            {
               clearAll();
               display.value = "";
            }
            else if(value == "+/-")
            {
                if(display.value != "" && display.value != "0" && display.value != "00")
                {
                    if(display.value[0] == "-"){
                        display.value = display.value.slice(1);
                    }
                    else{
                        display.value = "-" + display.value;
                    }
                }

            }
            else if(value == "%")
            {
                display.value = Number(display.value) / 100;
            }
        }
        else
        {
            if(value == ".")
            {
                if(!display.value.includes(".") && display.value != "" ){
                    if(display.value == "00")
                        {
                         display.value = "0.";
                        }
                    else{
                         display.value += value;
                        }

                }
            }
            else if(display.value == "0" || display.value == "00")
            {
                display.value = "0";
            }
            else{
                display.value += value;
            }
        }
    });


    //add buttons to calculator
    document.getElementById("buttons").appendChild(button);
}