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Testing and debugging a
program
When we write a program and it does not
produce an output, this is known as a
bug.To find these bugs and resolve any
errors is known as Debugging.

Find the one error in this code?
<html>
<body>
<script type="text/javascript">
var name = p ("enter your name","");
document.write(name.substring(0,1));
</script>
</body>
</html>

Find the two errors in this code?
<html>
<body>
<script type="javascript">
var maxmarks = prompt("enter the max marks of test","");
var marks = prompt("enter the marks of test","");
maxmarks=parseInt(maxmarks);
marks=parseInt(marks);
var percen=marks/maxmarks*100
if(percen>80)
{
document.write("you have",percen,"% in this test");
document.write("<PRE>nCongratulations for your performance </PRE>");
}
And
{
document.write (" you need to work a little more for excellence");
document.write ("<PRE>nPlan better and you will be there</PRE>");
}
</script>
</body>
</html>

Find five errors in this code?
<html>
<body>
<script type="text/javascript">
var marks = prompt("enter the marks of test","")
marks=parseInt(m);
if(marks60)
{
document.write("grade is a")
else if (marks >=45)
{
document.write("grade is b")
}
else if (marks >=30)
{
document.write("grade is c")
}
else
{
document.write("grade is f")
}
</body>
</html>

Programming activity

Write a program that will display a
message, the message can be anything
you want.
*Use the keyword “document.write”.


Write a program that will display either a
yes or no message when you enter a
number. For example to see if a number
divides by 2 or 3.
*Remember to use the “if condition” and the
keyword “parseInt” for this program.

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