numberconversion

function solve() {
    let button=document.getElementsByTagName("button")[0];
    button.addEventListener("click",()=>MakeMath());
    const binaryHolder="binary";
    const hexaDecimal="hexadecimal";
    function MakeMath(){
       let numberToConvert=Number(document.getElementById("input").value);
       let systemToConvertTo=document.getElementById("selectMenuTo").value;
       let  result;

       if(systemToConvertTo==binaryHolder){
            result=numberToConvert.toString(2);
       }

       if(systemToConvertTo==hexaDecimal){
         result=("0"+(numberToConvert.toString(16))).slice(-2).toUpperCase();
       }
       if(result){
           let resultDiv=document.getElementById("result");
           resultDiv.value=result;
       }
    }
}