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Pass uintmax_t or size_t to custom printf conversion specifier


Pass uintmax_t or size_t to custom printf conversion specifier

By : B Mclean
Date : October 21 2020, 06:10 PM
should help you out I'm writing a conversion specifier (%b) to be able to print any unsigned integer type in binary. ,
Is it just impossible right now to prepare for that?
code :


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printf conversion specifier for _Bool?

printf conversion specifier for _Bool?


By : shahrukh shaikh
Date : March 29 2020, 07:55 AM
Any of those help There is no specific conversion length modifier for _Bool type.
_Bool is an unsigned integer type large enough to store the values 0 and 1. You can print a _Bool this way:
code :
_Bool b = 1;
printf("%d\n", b);
Correct printf format specifier for size_t: %zu or %Iu?

Correct printf format specifier for size_t: %zu or %Iu?


By : Finn
Date : March 29 2020, 07:55 AM
it fixes the issue MS Visual Studio didn't support %zu printf specifier before VS2013. Starting from VS2013 (e.g. _MSC_VER >= 1800) %zu is available.
As an alternative, for previous versions of Visual Studio if you are printing small values (like number of elements from std containers) you can simply cast to an int and use %d:
code :
printf("count: %d\n", (int)str.size()); // less digital ink spent
// or:
printf("count: %u\n", (unsigned)str.size());
Does the C++ standard guarantee that std::uintmax_t can hold all values of std::size_t?

Does the C++ standard guarantee that std::uintmax_t can hold all values of std::size_t?


By : liansong
Date : March 29 2020, 07:55 AM
With these it helps Yes.
size_t is defined to be an unsigned integer type large enough to contain the size of any object. uintmax_t is defined to be able to store any value of any unsigned integer type. So if size_t can store it, uintmax_t can store it.
code :
uintmax_t
What is the loss of data in 'uintmax_t' to 'size_t' and 'unsigned int' conversion?

What is the loss of data in 'uintmax_t' to 'size_t' and 'unsigned int' conversion?


By : kotoe
Date : March 29 2020, 07:55 AM
may help you . Probably file->size is of type uintmax_t which is larger than the size_t that operator new[] takes for the array size. Typically the first one could be a 64bit integer while the second one would only be a 32bit.
Practically this will lead to problems when you are trying to handle files over 4GB, because the size_t can't represent such a large number of bytes. If you only expect to handle smaller files where size_t is large enough to store the file size, there won't be a problem.
C++ printf field width specifier ‘.*’ expects int not size_t

C++ printf field width specifier ‘.*’ expects int not size_t


By : Ibemac03
Date : March 29 2020, 07:55 AM
I wish this helpful for you I'm in the process of fixing compiler warnings in a legacy project I inherited. New compiler is gcc version 4.8.5 20150623 (Red Hat 4.8.5-4) (GCC). , Proper solution would be:
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