Step by Step solution about How to resolve the algorithm Integer comparison step by step in the PHP programming language

This PHP script prompts the user to enter two integers (int1 and int2) and then performs a basic comparison between them, printing whether int1 is less than (<), equal to (=), or greater than (>) int2.

Here's a breakdown:

1. fscanf(STDIN, "%d\n", $int1);: Reads the user's input from the standard input (STDIN) for the first integer and stores it in the $int1 variable.

2. It checks if the input is a valid number using is_numeric($int1). If the input is not numeric, it prints an error message and exits the script with a general error code (1).

3. Repeats the process for $int2.

4. After both inputs are validated as numeric, the script compares them using conditional statements:

   • if ($int1 < $int2) checks if int1 is less than int2.
   • if ($int1 == $int2) checks if int1 is equal to int2.
   • if ($int1 > $int2) checks if int1 is greater than int2.

5. If any of these conditions are true, the corresponding message will be printed.

6. If none of the conditions are met, no message will be printed.

In summary, this script validates user input for two integers, compares them, and informs the user about their relationship using the if statements.

<?php

echo "Enter an integer [int1]: ";
fscanf(STDIN, "%d\n", $int1);
if(!is_numeric($int1)) {
  echo "Invalid input; terminating.\n";
  exit(1);      // return w/ general error
}

echo "Enter an integer [int2]: ";
fscanf(STDIN, "%d\n", $int2);
if(!is_numeric($int2)) {
  echo "Invalid input; terminating.\n";
  exit(1);      // return w/ general error
}

// now $int1 and $int2 are numbers.
// for simplicity, this does not explicitly examine types

if($int1 < $int2)
  echo "int1 < int2\n";
if($int1 == $int2)
  echo "int1 = int2\n";
if($int1 > $int2)
  echo "int1 > int2\n";

?>