Coding Quiz Zone

function f(o) 
{
     if (o === undefined) debugger;
}

while (a != 0)
{
   if (a == 1) 
       continue;
   else 
       a++;
}

function tail(o) 
{ 
    for (; o.next; o = o.next) ;
    return o;
}

function printArray(a) 
{
     var len = a.length, i = 0;
     if (len == 0)
        console.log("Empty Array");
     else 
     {
         do 
         {
             console.log(a[i]);
         } while (++i < len);
     }
}

var grade='C';  
var result = '';  
switch(grade)
{  
    case 'A':  
        result+=" 10";  
    case 'B':  
        result+=" 9";  
    case 'C':  
        result+=" 8";  
    default:  
        result+=" 0";  
}  
document.write(result);