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This is my code

var x=prompt("enter number","7")
var i=0
var binaryvar=" "
function add(n){
if(n==0){
binaryvar="0"+binaryvar
}
else{
binaryvar="1"+binaryvar
}
}
function binary(){
while(i<1){
if(x==1){
add(1)
document.write(binaryvar)
break
}
else{
        
if(x%2==0){
x=x/2
add(0)
}
else{
x=(x-1)/2
add(1)
}
}
}
}
binary()