How can decimals not be rounded
3 Ansichten (letzte 30 Tage)
Ältere Kommentare anzeigen
Shuoze Xu
am 16 Jun. 2022
Bearbeitet: the cyclist
am 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.
0 Kommentare
Akzeptierte Antwort
the cyclist
am 16 Jun. 2022
Bearbeitet: the cyclist
am 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);
3 Kommentare
Stephen23
am 16 Jun. 2022
"I like to know more simple method."
Ultimately all numeric -> text conversion routines perform rounding, which is a good thing because it provides the most expected output from binary floating point numbers. For example:
x = 0.3
fprintf('%.40f\n',x)
A naive "simple" approach might simply truncate this to 0.29, which is unlikely to be what the user expects.
The cyclist's approach is good, performing a few basic numeric operations is not complex.
Walter Roberson
am 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.
Weitere Antworten (0)
Siehe auch
Kategorien
Mehr zu Loops and Conditional Statements finden Sie in Help Center und File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!