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MATLAB create a converter function (input: whole number) (output: string)

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Sang Yeob Kim
Sang Yeob Kim on 4 Dec 2014
Answered: Star Strider on 4 Dec 2014
In MATLAB, I want to create a function that takes input a whole number and output a string without using built-in functions such as num2str, int2str, or mat2str. The whole number can possibly with a leading minus sign. Please help!

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Answers (2)

Peter
Peter on 4 Dec 2014
You can use:
if (n < 0)
signstr = '-';
n = abs(n);
elseif (n == 0)
signstr = '0';
else
signstr = '';
end
str = '';
while n > 0
d = mod(n,10);
str = [char(d+48), str];
n = floor(n/10);
end
str = [signstr, str];
Or if you don't want to use the char() function, replace that line with a switch statement:
switch d
case 0, str = ['0', str];
case 1, str = ['1', str];
case 2, str = ['2', str];
case 3, str = ['3', str];
case 4, str = ['4', str];
case 5, str = ['5', str];
case 6, str = ['6', str];
case 7, str = ['7', str];
case 8, str = ['8', str];
case 9, str = ['9', str];
end

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Star Strider
Star Strider on 4 Dec 2014
Another way:
x = -fix(pi*1E+5); % Input Integer
ns = int8(sign(x));
n = abs(x);
prec = ceil(log10(n));
for k1 = prec:-1:1
d(k1) = fix(rem(n,10));
n = n/10;
end
ascii0 = uint8('0');
out = char(uint8(d)+ascii0);
if ns==-1
out = ['-' out];
end
produces:
out =
-314159

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