From 01c3eb389e314b4363eb670940b5bf7978b1678e Mon Sep 17 00:00:00 2001 From: Marti Bolivar Date: Thu, 24 Feb 2011 14:42:30 -0500 Subject: Rewrote Print class. The old Print class couldn't print uint64 values, and featured hand-hacked functionality better handled by snprintf(). Redid it using snprintf(), using "[u]int[8,16,32,64]" types for more clarity, and eliminated some private methods in favor of auxiliary functions in Print.cpp. Breaking compatibility with original implementation in three ways: - Print::print(double) is now accurate to 6 digits, rather than 2; this is consistent with the default behavior of the %f format specifier, and if you're using floating point, it's slow enough that you probably want the increased accuracy. - The only bases you can print a number to are 2, 8, 10, and 16. 8, 10, and 16 already have format specifiers, and 2 is an important special case; others complicate matters unnecessarily. - Printing numbers in bases other than 10 treats them as unsigned quantities (i.e., won't print '-' characters). This is more consistent with C++'s behavior for hexadecimal and octal literals (e.g., 0xFFFFFFFF has type uint32). Updated HardwareSerial and USBSerial class documentation to reflect the new behavior. --- source/lang/api/serialusb.rst | 35 ++++++++++++++++++++++++----------- 1 file changed, 24 insertions(+), 11 deletions(-) (limited to 'source/lang/api/serialusb.rst') diff --git a/source/lang/api/serialusb.rst b/source/lang/api/serialusb.rst index 3bb8c00..87fa641 100644 --- a/source/lang/api/serialusb.rst +++ b/source/lang/api/serialusb.rst @@ -109,26 +109,35 @@ world!")``. Print the argument's digits over the USB connection, in decimal format. -.. cpp:function:: USBSerial::print(long n) +.. cpp:function:: USBSerial::print(long long n) Print the argument's digits over the USB connection, in decimal format. Negative values will be prefixed with a ``'-'`` character. -.. cpp:function:: USBSerial::print(unsigned long n) +.. cpp:function:: USBSerial::print(unsigned long long n) Print the argument's digits over the USB connection, in decimal format. -.. cpp:function:: USBSerial::print(long n, int base) +.. _lang-serial-print-n-base: - Print the digits of ``n`` over the USB connection, in base ``base`` - (which may be between 2 and 16). The ``base`` value 2 corresponds - to binary, 8 to octal, 10 to decimal, and 16 to hexadecimal. - Negative values will be prefixed with a ``'-'`` character. +.. cpp:function:: USBSerial::print(int n, int base) + + Print the digits of ``n`` over USB, in base ``base``. The ``base`` + value 2 corresponds to binary, 8 to octal, 10 to decimal, and 16 to + hexadecimal (you can also use the symbolic constants ``BIN``, + ``OCT``, ``DEC``, ``HEX``). If ``base`` is 10, negative values + will be prefixed with a ``'-'`` character (otherwise, ``n`` will be + interpreted as an unsigned quantity). + +.. cpp:function:: HardwareSerial::print(long long n, int base) + + Same behavior as the above :ref:`print(int n, int base) + `, except with 64-bit values. .. cpp:function:: USBSerial::print(double n) - Print ``n``, accurate to 2 digits after the decimal point. + Print ``n``, accurate to 6 digits after the decimal point. .. _lang-serialusb-println: @@ -152,15 +161,19 @@ world!")``. Like ``print(n)``, followed by ``"\r\n"``. -.. cpp:function:: USBSerial::println(long n) +.. cpp:function:: USBSerial::println(long long n) Like ``print(n)``, followed by ``"\r\n"``. -.. cpp:function:: USBSerial::println(unsigned long n) +.. cpp:function:: USBSerial::println(unsigned long long n) Like ``print(n)``, followed by ``"\r\n"``. -.. cpp:function:: USBSerial::println(long n, int base) +.. cpp:function:: USBSerial::println(int n, int base) + + Like ``print(n, b)``, followed by ``"\r\n"``. + +.. cpp:function:: USBSerial::println(long long n, int base) Like ``print(n, b)``, followed by ``"\r\n"``. -- cgit v1.2.3