convert the numbers to word

[skimask]

sorry but my english is not good
when press the button 2 on keyboard the LCD show 2 on first position and after when press the button 4 on keyboard the LCD show 4 on second position etc.
I want the number 2,4,3,8 to be a variable (dec 2.348)

You want the variable in memory (whether it be a byte or a word) to be:
x = 2.348 ?