3
18/10/2024 9:34 am
Topic starter
Create a program that executes changes over a string.
First, you start with an empty string, then you receive the commands.
You will be receiving commands until the "End" command. There are five possible commands:
- "Add {string}"
- Concatenate {string} to the string.
- "Upgrade {char}"
- Find all occurances of {char} and replace it with the ASCII code plus one.
- "Print"
- Print the string.
- "Index {char}"
- Find all the indeces where {char} occurs, then print them separated by a space if no occurances – print "None".
- "Remove {string}"
- Remove all occurances of {string} from the string.
Input:
- On each line, until the "End" command is received, you will be receiving commands.
- All commands are case sensitive.
- The input will always be valid.
Output:
- Print the output of every command in the format described above.
Examples:
1 Answer
2
18/10/2024 9:40 am
Here is my solution:
<?php
$string = "";
$input = readline();
while ($input != "End") {
$args = explode(" ", $input);
$command = $args[0];
switch ($command) {
case 'Print':
echo $string . PHP_EOL;
break;
case 'Add':
$concat = $args[1];
$string .= $concat;
break;
case 'Upgrade':
$char = $args[1];
$replace = chr(ord($char) + 1);
$string = str_replace($char, $replace, $string);
break;
case 'Index':
$indeces = [];
$search = $args[1];
for ($i = 0; $i < strlen($string); $i++) {
if ($string[$i] == $search) {
$indeces[] = $i;
}
}
if (count($indeces) > 0) {
echo implode(" ", $indeces) . PHP_EOL;
} else {
echo "None";
}
break;
case 'Remove':
$remove = $args[1];
$string = str_replace($remove, "", $string);
break;
}
$input = readline();
}
