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

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!

Answer 1

[Peter]

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

Answer 2

[Star Strider]

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