Software Development Guide – auza.net https://auza.net Website Solutions, Mobile Apps, Content Writing, Digital Marketing Tue, 12 Nov 2013 16:03:19 +0000 en-US hourly 1 The Two General Loops https://auza.net/2010-08-11-the-two-general-loops.html https://auza.net/2010-08-11-the-two-general-loops.html#respond Wed, 11 Aug 2010 07:41:54 +0000 http://60c5add93b.nxcli.net/?p=81 There are two general loops, the while loop and the for loop.  There are variations on how the loops are implemented in different languages but the developer usually have two scenarios:  he knows how many times to loop or he needs to loop until a condition becomes true.

The for loop is used when the developer knows how many times to perform the loop.  For example, he needs to print the ascii code of the characters of the alphabet.  In PHP and in C (remove the $ sign from the variable if using C language), this can be done this way:

for ($i = 65; $i < 91; $i++) {
printf(“%c\n”, $i);
}

If we didn’t know that there are 26 characters in the alphabet but we know that the last character is the letter ‘Z’, then we would need to use a while loop:

$i = 65;
while (chr($i) != ‘Z’) {
printf(“%c\n”, $i);
$i++;
}
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