It would be respectful to refrain from such laziness as writing "any 1" for "anyone"
Unless you have some physical disability that impairs your use of the keyboard, or if you actually are composing this on a telephone keypad, please make the basic effort and common courtesy to write complete words


That depends entirely on how the device is connected to the port!


This would be clearly illustrated in the Data Sheets for the devices.

http://www.8052.com/forum/read.phtml?id=116601

A single-digit 7-Segment display consists of a total of 8 or 9 individual LEDs (one for each segment, plus one or two decimal points).
In a common-cathode display, the cathodes are all connected together - they are common. The anodes have individual connections.
Therefore, you connect the single, common, cathode terminal to GND and apply positive voltage to the appropriate anode terminal(s) to get the corresponding segment(s) to light up thus giving the required display character.

In a common-anode display, the anodes are all connected together - they are common. The cathodes have individual connections.
Therefore, you connect the single, common, anode terminal to a positive voltage and ground the appropriate cathode terminal(s) to get the corresponding segment(s) to light up thus giving the required display character.

Of course, each segment requires a current-limit (eg, series resistor) - as for any LED.

Since a standard 8051 port has open-collector drivers, a common-anode display makes most sense for direct connection - but be sure to observe the pin, port, and device current limits.
http://www.8052.com/forum/read.phtml?id=116449



You should now be in a position to do that!