How can I increase the decimal digits and control them in future .... How should I modify my program to do so ???

FOR EXAMPLE , WHAT SHOULD I DO TO INCREASE THE DECIMAL DIGITS TO 50 OR 100 ??? PLEASE, SHOW ME THE WAY ... clear all clc x=(-0.1); y=(0); fprintf(' i x \n') fprintf(' --- ------------- \n')

   for i=1:4;
     fx=(x(i))^3-(x(i))^2+2;
     fxx=3*(x(i))^2-2*(x(i));
     y(i)=x(i)-(fx/fxx);
     fy=(y(i))^3-(y(i))^2+2;
     fyy=3*(y(i))^2-2*(y(i));
     x(i+1)=x(i)+([fy-fx]/fyy);
   end
 for i=1:length(x)
     fprintf('%2i %18.15f\n',i,x(i))
 end

 %%THE RESULTS ARE 

 i        x          
 ---  ------------- 
 1 -0.100000000000000
 2 -3.119140528362807
 3 -1.474069695697443
 4 -1.017351956185236
 5 -1.000001047082565

[Stephen23]

duplicate:

https://www.mathworks.com/matlabcentral/answers/321657-i-need-more-decimal-digits-than-the-default-for-the-values-of-x