According to the given percentage, this command will return the active device's width pixel count (X Coordinate) as an Integer. With this command and the matching P2CY command, you can avoid relying on coordinates and to give relative size not based on resolution of device.
Scenario: In the following example we will get the width pixels value of 80% of the screen (where the EriBank logo ends (X coordinates of 80% of the screen)
int int0 = client.p2cx(80);
int int0 = client.P2cx(80);
int0 = client.P2cx ( 80 ) Report
var0 = self.client.p2cx(80)
my $int0 = $client->p2cx(80);