![]() The function is available by default in Arduino ( stdio.h is included in automatically), so if you write the code as shown above, it will compiled and run without any problem, but you won't see any output on the Serial Monitor, this is because Arduino does not use stdout, all the print (and keyboard input) are done via Serial interface. The function return an integer that represented the total characters written to the the stdout if successful, or a -1 is returned if for some reason it is failed to write to stdout. It can optionally contain embedded format tags that are replaced by the values specified in subsequent additional arguments and formatted as requested. The first argument of the function is a formatter string that contains the text to be written to stdout. ![]() If you have experience in C or C++ programming, you probably know the C library function printf(), so why not using printf()? printf("Temperature = %.1fc, Humidity = %.1f%%\n", temp, humidity) I personally think it should apply to all programming languages because after all ‘code is read more often than it is written’.Ĭode is read more often than it is written. If you are coming from the background of Python programming, you probably know the Zen of Python, it emphasis on 'Beautiful is better than ugly' and 'Readability counts'. All those 5 lines of code do is to print one line of text like this to Serial Monitor: Temperature = 32.6c, Humidity = 80.4% The code is ugly, repeatitive, and feel like written by someone who is learning programming, but you see this kind of code even in the examples that come with popular and well-written libraries. In Arduino programming, you often see code like this: Serial.print("Temperuature = ") Among all the reasons, one is its printf() and sprintf() implementation on floating point support. I like Arduino devices, but I don't quite like Arduino IDE.
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