Can anyone help me with this question..?

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vamshidhar Reddy Peruvala
回答： RAMAKANT SHAKYA 2019-2-7
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.

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回答（2 个）

Walter Roberson
Walter Roberson 2016-12-27
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...
RAMAKANT SHAKYA
RAMAKANT SHAKYA 2019-2-7
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

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