Can anyone help me with this question..?

Each number on telephone keypads, except 0 and 1, corresponds to a set of uppercase letters as shown in this list:

2 ABC, 3 DEF, 4 GHI, 5 JKL, 6 MNO, 7 PQRS, 8 TUV, 9 WXYZ

Hence, a phone-number specification can include uppercase letters and digits. Write a function called dial that takes as its input argument a string of length 16 or less that includes only these characters and returns as its output argument the telephone number as a uint64. Here is the input and output for one example of a call of the function:

Input: '1FUNDOG4YOU'
Output: 13863644968

please do not use "strrep function"

You can assume that a phone number never starts with 0. If the input contains any illegal characters, the function returns 0.

Answer 1

[Walter Roberson]

Hint: it is possible to index a sufficiently long array at a character string.

MyArray('QV9')

is the same as

MyArray(double('QV9'))

which would be the same as

MyArray([81, 86, 57])

and if 7 was stored at index 81...

Answer 2

[RAMAKANT SHAKYA]

function s2=dial(n)
p=[n];
s1='';
tx = ismember(p, ['A':'Z','0':'9']);%only digits and capital letters
tx1=sum(tx);
if length(p)<=16&& p(1,1)~='0'&& tx1==length(p) %finding letters
    for c=1:length(p)
        if p(c)=='A' || p(c)=='B' || p(c)=='C'
            s='2';
        elseif p(c)=='D' || p(c)=='E' || p(c)=='F'
            s='3';
        elseif p(c)=='G' || p(c)=='H' || p(c)=='I'
            s='4';
        elseif p(c)=='J' || p(c)=='K' || p(c)=='L'
            s='5';
        elseif p(c)=='M' || p(c)=='N' || p(c)=='O'
            s='6';
        elseif p(c)=='P' || p(c)=='Q' || p(c)=='R' || p(c)=='S'
            s='7';
        elseif p(c)=='T' || p(c)=='U' || p(c)=='V'
            s='8';
        elseif p(c)=='W' || p(c)=='X' || p(c)=='Y' || p(c)=='Z'
            s='9';
        else
            for r=0:9   %finding digit if present
                t=num2str(r);
                if p(c)==t
                    s=t;
                end
            end
        end
        s1=strcat(s1,s);    %adding string
        s2=str2num(s1);     %change into number
           
        s2=uint64(s2);  %changing class
        
    end
else
    s2=uint64(0);
end

end