title: I recently create a grade calculator by JavaScript but the script is not working
body: <p>I recently created a grade calculator using JavaScript... but the script is not working!</p>
  
  <p>the problem is.. when I enter a number like "55" the result is showing in three dialouge box one is saying " you got A+ " second is " you got A" and showing all the grades i add into the code</p>
  
  <p>the following code is</p>
  
  <pre><code>var name= prompt("Enter your name");
  
  var number= prompt("Enter your number");
  
  alert("Hello , " + name);
  
  if ( number &gt;= 80 ); {
  
  alert("Hello you got A+");
  
  } 
  
  if ( number &gt;= 70 ); {
  
  alert("Hello you have got A");
  
  }
  
   if ( number &gt;= 60 ); { 
  
  alert("Hello you have got A-");
  
   } if (number &gt;= 50 );  { 
  
  alert("Hello you have got B"); }
  </code></pre>
  
  <p>can any one help me? whats wrong ? really sorry for my bad english!!</p>