JavaScript Tutorial - "while" loop

There are several ways to loop, and we will continue with the "while" loop.

The while loop does not have all the nice features of a for loop, and the programmer needs to account for the loop variable initialization prior to the loop body and "manually" increment the loop variables in the loop body.

One reason to choose the while loop is that it need not confine itself to loop variables. The expression can be a function.

The basic form for a do/while loop is:

while ( expression ) {
	block of code ...
}

Example: work/whileloop.html

<HTML>
<BODY>
<CENTER>
<TABLE BORDER=1 CELLPADDING=6>
<SCRIPT LANGUAGE="JavaScript">
var i=0,j=0;	// loop variables
while (j <= 10) {
	i=0;
	j++;
	document.write('<TR>');
	while (i <= 10) {
		i++
		document.write('<TD ALIGN="RIGHT">',i*j,'</TD>');
	}
	document.write('</TR>\n');	// end the line
}
</SCRIPT>
</TABLE>
</CENTER>
</BODY>
</HTML>

HOMEWORK:

Use the functions F2C() and C2F() defined in a previous assignment and create a conversion table. Use the values 0 to 100 in increments of 2. Display the value, the Celsius conversion (F2C), and the Fahrenheit conversion (C2F).
You can use either <PRE> or <TABLE> formatting.

Slide 10