LPC 2148 Push Button interrupt problem

I am currently using LPC 2148.

I have a push button attached to port 0.15 and with every push the push button makes the pin high.

I want to count the push and with every push i want to store it into a variable and do some conversions at every push and Send the conversion data to LCD.

Can anyone guide me with the syntax, whether i should use interrupt or counter for the same?.

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