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  1. #!/usr/bin/php 
  2.  
  3. <?php
  4.   define("PI",3.1415926535898);
  5.  
  6.   echo "Digite o valor do raio: ";
  7.   $raio = (float)readline();
  8.  
  9.   $area = PI * pow($raio,2);
  10.  
  11.   print "A área é igual a " .$area;
  12.  
  13.  ?>
Success #stdin #stdout 0.03s 26036KB
comments (?)
stdin 
Standard input is empty
stdout 
Digite o valor do raio: A área é igual a 0
https://ideone.com/eOQ78Z
language:
PHP (php 7.3.5)
created:
12 hours ago
visibility:
public

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