Smart keypad challenge

#1

how to do this question i am not able to understand the problem

#2

have you used the keypad phone?
in that to write a message we have to press the buttons
using 1 we can type “.+@$” using 2 we can type “abc” etc.

string table[] = { " ", “.+@$”, “abc”, “def”, “ghi”, “jkl” , “mno”, “pqrs” , “tuv”, “wxyz” };

now if a person press 12 then you have to print all the possible strings that can generate
Output:
.a
.b
.c
+a
+b
+c
@a
@b
@c
$a
$b
$c

HINT : use recursion to solve the problem

#3

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