Qué (quién) es printf - definición

FORMAT STRING USED BY THE PRINTF C FUNCTION

%s (printf); %d; Format string; Placeholder (Computing); Std::printf; Printf(); Printf; Format specifiers

printf

<library> The standard function in the C programming language library for printing formatted output. The first argument is a format string which may contain ordinary characters which are just printed and "conversion specifications" - sequences beginning with '%' such as %6d which describe how the other arguments should be printed, in this case as a six-character decimal integer padded on the right with spaces. Possible conversion specifications are d, i or u (decimal integer), o (octal), x, X or p (hexadecimal), f (floating-point), e or E (mantissa and exponent, e.g. 1.23E-22), g or G (f or e format as appropriate to the value printed), c (a single character), s (a string), % (i.e. %% - print a % character). d, i, f, e, g are signed, the rest are unsigned. The variant fprintf prints to a given output stream and sprintf stores what would be printed in a string variable. Unix manual page: printf(3). (1996-12-08)

debugging by printf

<programming> The debugging technique where the programmer inserts print statements into a program so that when run the program leaves a "trail of breadcrumbs" allowing him to see which parts were executed. The information output may just be a short string to indicate that a particular point in the code has been reached or it might be a complete stack trace. The output typically just goes to the window or terminal in which the program is running or may be written to a log file. printf is the standard C print function, other languages would use different names. (2007-03-08)

debug

PROCESS OF FINDING AND RESOLVING DEFECTS OR PROBLEMS WITHIN A COMPUTER PROGRAM

Debugged; Remote debugging; Debuggery; Post-mortem debugging; De Bug; Debug; Steps To Reproduce; Saff Squeeze; Printf debugging; Anti-debugging code; Anti-debugging; Print debugging; De-bug; Debugger detection; Steps to reproduce

¦ verb (debugs, debugging, debugged)

1. remove errors from (computer hardware or software).

2. detect and remove concealed microphones from.

Derivatives

debugger noun

Wikipedia

Printf format string

The printf format string is a control parameter used by a class of functions in the input/output libraries of C and many other programming languages. The string is written in a simple template language: characters are usually copied literally into the function's output, but format specifiers, which start with a % character, indicate the location and method to translate a piece of data (such as a number) to characters.

"printf" is the name of one of the main C output functions, and stands for "print formatted". printf format strings are complementary to scanf format strings, which provide formatted input (lexing aka. parsing). In both cases these provide simple functionality and fixed format compared to more sophisticated and flexible template engines or lexers/parsers, but are sufficient for many purposes.

Many languages other than C copy the printf format string syntax closely or exactly in their own I/O functions.

Mismatches between the format specifiers and type of the data can cause crashes and other vulnerabilities. The format string itself is very often a string literal, which allows static analysis of the function call. However, it can also be the value of a variable, which allows for dynamic formatting but also a security vulnerability known as an uncontrolled format string exploit.

https://en.wikipedia.org/wiki/Printf format string