Calculator/script.js at main · Ajeet-singh-Rajput9971/Calculator · GitHub

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let inputbox = document.getElementById('input');
let buttons = document.querySelectorAll('button');
let opreter = document.querySelectorAll(".opretor");

let brackit = 0;

buttons.forEach((button) => {
    button.addEventListener("click",()=>{
        btnType = button.innerText;

        // last charector of inputbox;
        let lastChar = inputbox.value.slice(-1);
        let operator = ["+","-","/","*","."];
        if(btnType ==="="){
            let result = eval(inputbox.value);

            if(!Number.isInteger(result)){
                 inputbox.value = result.toFixed(4);
            }
            else{
                inputbox.value = result;
            }

        }
      else if (inputbox.value.length >=11 && btnType !=="DEL"){
            return;
        }

        // This block stop printing operators next after operators and replace the last operator with new operator that is clicked.

    else if(operator.includes(lastChar) && operator.includes(btnType)){
        inputbox.value = inputbox.value.slice(0,-1) + btnType;
    }
        // Delete button;

        else if(btnType === "DEL"){
            inputbox.value = inputbox.value.slice(0,-1);
        }

        // All Clear button;

        else if(btnType === "AC"){
            inputbox.value = "";
        }

        else if(btnType ==="%"){
            if(inputbox.value !==""){
                inputbox.value /= 100;
            }
        }

        else if (btnType ==="()"){
            if(brackit == 0){
                inputbox.value += "(";
                brackit = 1;
            }
            else{
                inputbox.value += ")";
                brackit = 0;
            }

        }
        else{
             inputbox.value  += button.innerText;
        }


    });
} );