logic.js

let screen= document.getElementById('screen')
buttons=document.querySelectorAll('button')
let screenValue="";
for(item of buttons){
    item.addEventListener('click',(e)=> {
        buttonText = e.target.innerText;
        if(buttonText=='x'){
            buttonText='*';
            screenValue += buttonText;
            screen.value = screenValue;
        }
        else if(buttonText =='AC'){
            screenValue = "";
            screen.value=screenValue;
        }
        else if(buttonText == 'DEL'){
            screenValue=screen.value.substr(0 ,screen.value.length - 1);
            screen.value=screenValue;
        }
        else if(buttonText=='='){
            screen.value=eval(screenValue);
        }
        else{
            screenValue += buttonText;
            screen.value = screenValue;
        }
        

    })
}