withdraw and deposit

// withdraw
function withdraw(balance,n){
    // initialize balance to zero
  balance = 2000;
  
 if(n < balance){
   balance = balance - n ;
 }
 else if(n > balance){
     alert("INSUFFICIENT FUNDS");
 }
 else{
     confirm('are you sure you would like to withdraw all you funds from this account?');
     balance = null
  
 }   
 
 console.log(balance);
};
withdraw(2000,1900);


function deposit(balance,n){
    balance = 0;
    
if (n != 0 ){
    balance = balance + n ;
}
else{
    alert('please enter a valid deposit');
}
console.log(balance);
}
deposit(0,100)