Code

				
		var studentGrade = window.prompt('Enter your grade:','');
		
		while (studentGrade > 100) 
		{
			var studentGrade = window.prompt('Enter a valid grade:','');
    		if (studentGrade <= 100) 
			{            
			break;
			} 
		}	
		
		if(studentGrade <= 39)
		{
		  document.write("Fail");
		
		}
		else if (studentGrade <= 59)
		{
		  document.write("Pass");
		
		}
		else if(studentGrade <= 69)
		{
			document.write("Merit");
		}
		else if(studentGrade <= 100)
		{
			document.write("Distinction");
		}