Because you used only %d (int) and long long is a 64 bit type with alignment, printf is using the wrong data from the stack (such as the long long alignment's padding bytes).

Specifies that the argument is a long long int or unsigned long long int. /* * Copyright (c) 2000 Apple Computer, Inc. All rights reserved. For a long long integer type, the printf conversion specifier is %lld (or %llx for hex format). snprintf(buf, 64, '%'PRId64, var); there is just 'ld' in output buffer. Parameters str C-string containing the representation of an integral number. It formats the output, like the width of the output, sign of the output e.t.c For systems that don't provide extra-long integers, this is the same as long int.) L: For floating point types, causes printf to expect a long double argument. When I'm trying to do (var is long long type): snprintf(buf, 64, '%lld', var); or. When no size prefix is specified, the formatter consumes integer arguments—for example, signed or unsigned char, short, int, long, and enumeration types—as 32-bit int types, and float, double, and long double floating-point arguments are consumed as 64-bit double types. This is a tiny printf() function that can be used with the chips that come with the Launchpad. Hello, There is probably a bug in SW4STM32 toolchain.

Data types in c refer to an extensive system used for declaring variables or functions of different types. Whether to print formatted output or to take formatted input we need format specifiers.

"It seems that printf can not print unsigned long long integer" There is no "seems" about it - you have just been told explicitly by Reinhard Keil himself that The CARM compiler does not support printout of long long int values. should "__int64" be used instead of "long long" when programming for windows (since "long long" by ISO standards is not garaunteed to be just 64bits)? I.E.

(The long long type is an extension supported by the GNU C compiler. The printf function in C programming language is used for output formatting. unsigned long long int (if PRINTF_SUPPORT_LONG_LONG is defined) j: intmax_t: uintmax_t: z: size_t: size_t: t: ptrdiff_t: ptrdiff_t (if PRINTF_SUPPORT_PTRDIFF_T is defined) Return Value. Here is a complete list … Continue reading List of all format specifiers in C programming → For integer types, causes printf to expect a long long-sized integer argument. And if so, how does Microsoft then handle an "unsigned long long" type for scanf/printf? long long int a=0x1200340056007800; printf("%d %d\n", a, b); 就可以看出如何打印的了，注意把打印出的十进制值转换为16进制 0 2009-03-30 11:26:36. Writes the C string pointed by format to the standard output ().If format includes format specifiers (subsequences beginning with %), the additional arguments following format are formatted and inserted in the resulting string replacing their respective specifiers. C 언어에 long long(아주 긴 정수) 타입과 long double 타입이 추가되었지만 이를 출력하는 방법을 몰라서 제대로 사용하지 못하는 경우가 있다. The type of a variable determines how much space it occupies in storage and how the bit pattern stored is interpreted. 可以看到，size_t 和 unsigned long 比较同步。另外 ssize_t 和 size_t 的关系就像 int 和 unsigned int 的关系。（参考1，参考2） 格式控制（printf）