I recommend @Jens Gustedt hexadecimal solution: use %a. OP wants “print with maximum precision (or at least to the most significant decimal)”. A simple example would be to print one seventh as in: But let’s dig deeper … Mathematically, the answer is “0.142857 142857 142857 …”, but we are using finite precision floating point numbers. … Read more
Since you’re on an embedded platform, it’s quite possible that you don’t have the full range of capabilities from the printf()-style functions. Assuming you have floats at all (still not necessarily a given for embedded stuff), you can emulate it with something like: You’ll need to restrict how many characters come after the decimal based … Read more
There’s a trick to this. You need to duplicate the open file descriptor to file descriptor 1, i.e. stdout. Then you can use printf:
People (and especially beginners) should never use scanf(“%s”) or gets() or any other functions that do not have buffer overflow protection, unless you know for certain that the input will always be of a specific format (and perhaps not even then). Remember than scanf stands for “scan formatted” and there’s precious little less formatted than user-entered data. It’s ideal if you have total control of … Read more
you need to iterate through the array’s elements or create a function that returns stacked sn printf and then prints it with
Output is often buffered by the system. You can call fflush, but sometimes, depending on how the caching works, simply ending the output with a newline is sufficient. So try changing to And, if that doesn’t help, to (And stderr often isn’t cached, as you want to see errors immediately.) Finally, you will see output … Read more
Declare your ch as And your printf will work.
I assume you are running into a buffering issue, such that your program exits before your buffer flushes. When you use printf() or print() it doesn’t necessarily flush without a newline. You can use an explicit flush() or add a new-line (which will also cause a flush()) See also Buffered Streams – The Java Tutorials, Flushing Buffered Streams which says in part Some buffered … Read more
You are failing to access a field of the indexed union array: mydata[0] is a value of type union data, and can’t be cast to uint64_t. You need to access the proper union member: to select the uint64_t value. No need for the cast. Also: Use PRIu64 to portably print 64-bit values, you can’t assume … Read more