Mismatch between the format specifiers and count and type of values results in undefined behavior and possibly program crash. It is available in gcc, clang and tcc Some shells implement the command as builtin and some provide it as a utility program [2] the command has similar syntax and semantics as the library function
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The command outputs text to standard output [3] as specified by a format string and a.
Printf is a c function belonging to the ansi c standard library, and included in the file stdio.h
Its purpose is to print formatted text to the standard output stream Hence the f in the name stands for formatted. In the above example, the main ( ) function defines where the program should start executing The function body consists of a single statement, a call to the printf () function, which stands for print f ormatted
It outputs to the console whatever is passed to it as the parameter, in this case the string hello, world The c programming language provides many standard library functions for file input and output These functions make up the bulk of the c standard library header <stdio.h> [1] the functionality descends from a portable i/o package written by mike lesk at bell labs in the early 1970s, [2] and officially became part of the unix operating system in version 7
[3] the i/o functionality of c is.
String interpolation is an alternative to building string via concatenation, which requires repeat quoting and unquoting [2] or substituting into a printf format string, where the variable is far from where it is used Consider this example in ruby Apples = 4 puts i have #{apples} apples.
The c function printf and the common lisp function format are two such examples Both take one argument that specifies the formatting of the output, and any number of arguments that provide the values to be formatted For example, the escape sequence \e for the escape character with ascii hex value 1b which was not added to the standard due to lacking representation in other character sets (such as ebcdic)
