Difference between %d and %f?

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xxtan1
xxtan1 2020-8-3
回答： Steven Lord 2024-7-7
Hi, I dont quite understand the difference between %d and %f and its usage in certain cases.
Does %d correspond to int in C and %f correspond to float?
What is the case I have to use %d instead of %f?

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Adam Danz
Adam Danz 2020-8-3
编辑：Adam Danz 2020-8-4
Refer to the documentation.
%d represents signed integers (base 10).
sprintf('John is %d years old', 7)
% 'John is 7 years old'
%f represents floating point numbers.
sprintf('The first 8 dp of pi are %.8f', pi)
% 'The first 8 dp of pi are 3.14159265'
%f can also be used to represent integers by rounding floating point inputs. %d cannot be used in this way.
sprintf('Pi is rounded to %.0f', pi)
% 'Pi is rounded to 3'
sprintf('Pi is rounded to %.d', pi)
% 'Pi is rounded to 3e+00'

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Steven Lord
Steven Lord 2024-7-7
Ran in:
If you want to print integer values, you probably want to use %d.
If you want to print non-integer values, you probably want to use %f.
While you can use %f to print integer values (as per the second line of code below) if you try to use %d to print non-integer values it will actually switch to a different specifier (%e I believe, as per the note in the Notable Behavior of Conversions with Formatting Operators section of the description of the formatSpec input argument on the fprintf documentation page.)
fprintf("This uses the %%d format specifier: %d\n", 42)
This uses the %d format specifier: 42
fprintf("This uses the %%f format specifier: %f\n", 42)
This uses the %f format specifier: 42.000000
fprintf("This uses the %%d format specifier: %d\n", pi)
This uses the %d format specifier: 3.141593e+00
fprintf("This uses the %%f format specifier: %f\n", pi)
This uses the %f format specifier: 3.141593

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