If PIND5 is high

Add function ()

If PIND6 is high

Subtract function()

If neither is high (make PIND7 view)

View Function()

How do you write this in ardunio (c++) programming?

Actually it for food tracker and we are using a switch that has three way one to add foods in the lists , the other how much food are used up and the third to view status of the lists. The input port for the Atmega 328p are PORTD5, PORTD6,PORTD7 and It's goes out to PORTB4, PORTB3 and PORTB2