How can decimals not be rounded

1 view (last 30 days)
Shuoze Xu
Shuoze Xu on 16 Jun 2022
Edited: the cyclist on 16 Jun 2022
Hi.
That is my code.
float_number = input('Please enter a float point number: ');
fprintf("The number is %.2f\n",float_number);
Sample test:
Please enter a float point number: 5.126
The number is 5.13
When the user enters a decimal, the result only keeps two decimal places, but I don't want the last decimal place to be rounded.
I don't want 5.13. I want 5.12.
How to do it?
Thank you.

Accepted Answer

the cyclist
the cyclist on 16 Jun 2022
Edited: the cyclist on 16 Jun 2022
Here is one way:
roundTo = 2; % Set this value
float_number = 5.126; % User's value
% Algorithm
roundToPower = 10^roundTo;
roundedDisp = floor(float_number*roundToPower)/roundToPower;
fprintf("The number is %.2f\n",roundedDisp);
The number is 5.12
  3 Comments
Walter Roberson
Walter Roberson on 16 Jun 2022
MATLAB does not provide any built-in function for this purpose.
For MacOS only (not sure if Linux was fixed yet), you can sprintf the number with a %.800g format, and do text manipulation on the result to get the number of decimal places you want.

Sign in to comment.

More Answers (0)

Tags

Products


Release

R2021b

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by