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WMDD 4820 - Quiz 3
// 1. How many times are the following loop bodies repeated?
// What is the printout of each loop? (3 points)
// a.
var i = 1;
while (i < 10)
if (i % 2 == 0)
document.write( i + "<br />");
// Answer: infinity loop. i will be never incremented.
// b.
var i = 1;
while (i < 10)
if (i % 2 == 0)
document.write( i++ + "<br />");
// Answer: infinity loop. i will be never incremented.
// c.
var i = 1;
while (i < 10)
if (i++ % 2 == 0)
document.write( i );
// Answer:
// 3
// 5
// 7
// 9
// -----------------------------------------------------------------------------
// 2. Will the following programs terminate? If so, give the output. (4 points)
// a.
var balance = 49;
while (true)
{
if (balance < 9)
break;
balance = balance - 9;
}
document.write ( "Balance is " + balance );
// Answer: Balance is 4
// b.
var balance = 49;
while (true)
{
if (balance < 9)
continue;
balance = balance - 9;
}
document.write ( "Balance is " + balance );
// -----------------------------------------------------------------------------
// 3. Show the output of the following code segments. (6 points)
// a.
var i = 0;
while (i < 4)
{
for (var j = i; j > 1; j--)
document.write ( j );
document.write( "****" + "<br/>" );
i++;
}
// Answer:
// ****
// ****
// 2****
// 32****
// b.
var i = 4;
while (i >= 1)
{
var num = 1;
for (var j = 1; j <= i; j++)
{
document.write( num + "xxx" );
num *= 2;
}
document.write( "<br/>" );
i--;
}
// Answer:
// 1xxx2xxx4xxx8xxx
// 1xxx2xxx4xxx
// 1xxx2xxx
// 1xxx
// c.
var row = 4;
while ( row >= 1 ) {
column = 1;
while ( column <= 5 ) {
document.write ( row % 2 ? "<" : ">" );
++column;
}
--row;
document.write("<br/>");
}
// Answer
// >>>>>
// <<<<<
// >>>>>
// <<<<<
// -----------------------------------------------------------------------------
// 4. How many times is the print statement executed? (2 points)
for (var i = 0; i < 10; i++)
for (var j = 0; j < i; j++)
document.write( i * j + "<br/>");
// Answer: 45 times
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