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C function to format and output text
printf is a C standard library function and is also a Linux terminal (shell) command that formats text and writes it to standard output. The function accepts
Printf
Shell command for formatting and outputting text; like printf() library function
printf is a shell command that formats and outputs text like the same-named C function. It is available in a variety of Unix and Unix-like systems. Some
Printf_(Unix)
Formatting to make code or markup easier to read
k){if(k<1||k>2){printf("out of range\n"); printf("this function requires a value of 1 or 2\n");}else{ printf("Switching\n");switch(k){case 1:printf("1\n");break;case
Pretty-printing
Family of backward-compatible assembly languages
compiled ; against the C Standard Library extern printf ; declares the use of external symbol, as printf ; printf is declared in a different object-module. ;
X86_assembly_language
GNU replacement for the Bourne shell
Group $ printf '<newline>: <%b>\n' $'\n' <newline>: < > $ printf '<tab>: <%b>\n' $'\t' <tab>: < > $ printf '<space>: <%s>\n' " " <space>: < > $ printf '<NUL>:
Bash_(Unix_shell)
Fixing defects in an engineered system
into the source code. The latter is sometimes called printf debugging, due to the use of the printf function in C. This kind of debugging was turned on
Debugging
Computer bug exploit caused by invalid data
"Password1"; printf("Enter an integer\n"); scanf("%d", &int_in); printf("Please enter a string\n"); fgets(user_input, sizeof(user_input), stdin); printf(user_input);
Code_injection
Unix system call for querying file metadata
exit(EXIT_FAILURE); } printf("%s:\n", argv[i]); printf("\tinode: %u\n", sb.st_ino); printf("\tperms: %o\n", sb.st_mode & (S_IRWXU | S_IRWXG | S_IRWXO)); printf("\tlinks:
Stat_(system_call)
General-purpose programming language
original version was: main() { printf("hello, world\n"); } A more modern version is: #include <stdio.h> int main(void) { printf("hello, world\n"); } The first
C_(programming_language)
Data types supported by the C programming language
functionality of the types defined in the <stdint.h> header. It defines macros for printf format string and scanf format string specifiers corresponding to the types
C_data_types
Connected input and output streams for computer programs
System.out.printf("Number is: %d%n", number); // Read input for a name and age: Scanner input = new Scanner(System.in); System.out.printf("%nEnter name:
Standard_streams
GNU internationalization and localization software
clutter, this function is commonly aliased to _: printf(gettext("My name is %s.\n"), my_name); printf(_("My name is %s.\n"), my_name); // same, but shorter
Gettext
Topics referred to by the same term
%s may refer to: %s, in printf format string %s, in scanf format string %s, seconds in the strftime format string %s, used to check the Unix timestamp
%s
Type of software vulnerability
string parameter in certain C functions that perform formatting, such as printf(). A malicious user may use the %s and %x format tokens, among others, to
Uncontrolled_format_string
Canadian electronic musician
including Salt, 7 sevens.med, Shitfuckers!, and his fourth studio album, printf("shiver in eternal darkness/n");. Funk then moved to using a PC sometime
Venetian_Snares
Shell command for writing to standard output
and back to Normal ${NORMAL}" Portably with printf: BGRED=`printf '\33[41m'` NORMAL=`printf '\33[m'` printf '%s\n' "${BGRED}Text on red background${NORMAL}"
Echo_(command)
Method used for display options on video text terminals
such as with make ; flasher . flasher () { while true; do printf '\e[?5h'; sleep 0.1; printf '\e[?5l'; read -s -n1 -t1 && break; done; } The following
ANSI_escape_code
Bottom-up parser that interprets an operator-precedence grammar
continue; case ')': printf("))))"); continue; case '^': printf(")^("); continue; case '*': printf("))*(("); continue; case '/': printf("))/(("); continue;
Operator-precedence_parser
Control parameter used in programming languages
68. Input format strings are complementary to output format strings (see printf), which provide formatted output (templating). Mike Lesk's portable input/output
Scanf
Tool of editors for programming, scripting, and markup
#include <stdio.h> int main() { printf("Hello World\n"); return 0; } // Hello World #include <stdio.h> int main() { printf("Hello World\n"); return 0; }
Syntax_highlighting
Header file for C programs
skipping first()'s call of printf(). #include <setjmp.h> #include <stdio.h> static jmp_buf buf; void second() { printf("second\n"); // prints longjmp(buf
Setjmp.h
Keyword used in some programming languages to tag variables
be created on stack int a = 10; int b = 100; int c = 0; int d = 0; /* "printf" will be called with arguments "%d" and 110 (the compiler computes the sum
Volatile (computer programming)
Volatile_(computer_programming)
Operations transforming individual bits of integral data types
0; i--) { putchar(x & (1u << i) ? '1' : '0'); } printf("\n"); } int main( void ) { int j = 5225; printf("%d in binary \t\t ", j); showbits(j); /* the loop
Bitwise_operations_in_C
bash shell or printing IFS with commands like printf %s "$IFS" | od -c, printf "%q\n" "$IFS" or printf %s "$IFS" | cat -A (the latter two commands being
Input_Field_Separators
Software development methodology
performs formatting, such as printf(). The attack involves the adversary reading from or writing to the stack. The C printf function writes output to stdout
Secure_coding
Software documentation on Unix systems
for reading printf(3C) is: man -s 3c printf On Linux and BSD derivatives the same invocation would be: man 3 printf which searches for printf in section
Man_page
Graphical representation of a computer program or algorithm
print_within_parentheses(const char *p) { printf("("); // 1 if (p != NULL) { // 1 printf("%s", p); // 2 } // 2 printf(")"); // 3 } This function has three
Control-flow_graph
Form of text that defines C code
(num) { case 1: printf("Number is 1\n"); break case 2: printf("Number is 2\n"); break; case 3: printf("Number is 3\n"); break; default: printf("Number is not
C_syntax
Loop transformation technique
(repeat--) { printf("process(%d)\n", i); printf("process(%d)\n", i + 1); printf("process(%d)\n", i + 2); printf("process(%d)\n", i + 3); printf("process(%d)\n"
Loop_unrolling
Execution model which allows for parallel computing
NUM_THREADS; printf("Thread %d: Started.\n", index); printf("Thread %d: Will be sleeping for %d seconds.\n", index, sleep_time); sleep(sleep_time); printf("Thread
Pthreads
Printf-like function for the Linux kernel
printk is a printf-like function of the Linux kernel interface for formatting and writing kernel log entries. Since the C standard library (which contains
Printk
C/C++ programming idiom
value2; int value3; void variables() { printf("%s = %d\n", "value1", value1); printf("%s = %d\n", "value2", value2); printf("%s = %d\n", "value3", value3); }
X_macro
C library function for parsing command-line options
{ printf("digits occur in two different argv-elements.\n"); } digit_optind = this_option_optind; printf("option %c\n", c); break; case 'a': printf("option
Getopt
Base-16 numeric representation
represents the Esc control character) and to output an integer as hex via printf-like function, the format conversion code %X or %x is used In URIs (including
Hexadecimal
Computer program or file valid in multiple programming languages or file formats
#define main() int main(void) #define printf printf( #define true ) #define function function main() { printf "Hello, world!\n"true/* 2> /dev/null |
Polyglot_(computing)
GNU implementation of the standard C library
APIs include such foundational facilities as open, read, write, malloc, printf, getaddrinfo, dlopen, pthread_create, crypt, login, exit and more. The glibc
Glibc
Software debugger
in C: #include <stdio.h> int main(void) { char msg = "Hello, world!\n"; printf("%s", msg); return 0; } Using the clang compiler on macOS, the code above
LLDB_(debugger)
Programmable text editor
hello.c with the following contents: int main(int argc, char **argv) { printf("Hello world!\n"); return 0; } ... one could use the following TECO session
TECO_(text_editor)
Self-replicating program
for (int i = 0; i < l.length; i++) { // Print string array", " System.out.printf(\"%s%c%s%c,%n\", l[4], q, l[i], q);", " }", " for (int i = 5; i < l.length;
Quine_(computing)
Input/output functionality in the C programming language
fclose(fp); return EXIT_FAILURE; } fclose(fp); printf("The bytes read were: "); for (size_t i = 0; i < len; ++i) { printf("%02X ", (unsigned char)buffer[i]); }
C_file_input/output
Header file for C programs
ellipsis in place of the last parameter. An example of such a function is printf. Respectively, declarations and definitions are done similarly as such int
Stdarg.h
Traditional first example of a computer programming language
memorandum by Brian Kernighan, Programming in C: A Tutorial: main( ) { printf("hello, world"); } In the above example, the main( ) function defines where
Hello,_world
General-purpose, object-oriented programming language
[self integer]; for (i = 0; i < x; i++) { printf("*"); } printf("\n"); return self; } - (id) showint { printf("%d\n", [self integer]); return self; } @end
Objective-C
Instructions a computer can execute
*student = student_new( "The Student" ); student->grade = grade_new( 'a' ); printf( "%s: Numeric grade = %d\n", /* Whereas a subset exists, inheritance does
Computer_program
Script written for an operating system shell
automatically: #!/bin/sh printf 'compiling...\n' cc -c foo.c cc -c bar.c cc -c qux.c cc -o myprog foo.o bar.o qux.o printf 'done.\n' The script would
Shell_script
Local search algorithm
{ printf("%s = [", pathName.c_str()); for (int i = 0; i < path.size(); i++) { if (i % 10 == 0) { printf("\n "); } if (i < path.size() - 1) { printf("[%
2-opt
High-performance JSON processor for Java
class); System.out.printf("Read and parsed Person from JSON: %s%n", q); Person p = new Person(1, "Roger", "Rabbit"); System.out.printf("Person object %s
Jackson_(API)
Replacing placeholders in a string with values
concatenation, which requires repeat quoting and unquoting; or substituting into a printf format string, where the variable is far from where it is used. Consider
String_interpolation
Family of programming languages
algol68 test: ( real a,b,c,d; # printf – sends output to the file stand out. # # printf($p$); – selects a new page # printf(($pg$,"Enter d:")); read(d);
ALGOL
Class of type systems
types of methods: # let y = object method get_x = 2 method set_x y = Printf.printf "%d\n" y end;; val y : < get_x : int; set_x : int -> unit > = <obj>
Structural_type_system
Memory map - POSIX-compliant system call
case 0: childpid = getpid(); printf("PID %d:\tanonymous %s, zero-backed %s\n", childpid, anon, zero); sleep(3); printf("PID %d:\tanonymous %s, zero-backed
Mmap
Microsoft programming language
type fields Extensions to array slicing Type inference enhancements 4.0 Printf on unitized values Extension property initializers Non-null provided types
F Sharp (programming language)
F_Sharp_(programming_language)
Concise notation for large or small numbers
to be decimal. This notation can be produced by implementations of the printf family of functions following the C99 specification and (Single Unix Specification)
Scientific_notation
Programming statement for branching control based on a value
(age) { case 0: printf("You're newborn!"); break; case 1: printf("You're one."); break; case 2: printf("You're two."); break; case 3: printf("You're three
Switch_statement
Symbol for the fraction of a hundred
functions such as printf and scanf), the percent sign denotes parts of the template string that will be replaced with arguments. (See printf format string
Percent_sign
Concept in software engineering
this.id); stmt.executeUpdate(); } } } catch (SQLException e) { System.err.printf("A SQLException occurred: %s%n", e.getMessage()); e.printStackTrace(); }
Active_record_pattern
User-friendly interactive Unix shell
commandline". GitHub. Retrieved 9 April 2021. Nordal, Andreas (11 July 2013). "printf does not support \e". fish issues. Retrieved 24 March 2016. Official website
Fish_(Unix_shell)
Programming idiom
loop" without halting, in C: #include <stdio.h> int main() { for (;;) { printf("Infinite loop\n"); } return 0; } The form for (;;) for an infinite loop
Infinite_loop
Storage size operator in C and C++
type is four bytes long, the following code fragment prints 1,4: char c; printf("%zu,%zu\n", sizeof c, sizeof(int)); Certain standard header files, such
Sizeof
Text processor used with C and C++ and other programming tools
'stdio.h' in which the function printf() and other symbols are declared. #include <stdio.h> int main(void) { printf("Hello, World!\n"); return 0; } In
C_preprocessor
Java library
CLibrary.class); void printf(String format, Object... args); } public static void main(String[] args) { CLibrary.INSTANCE.printf("Hello, World\n"); for
Java_Native_Access
External instruction to a computer program
conditional. For example, printing a message in Bash is via the command printf, while in Python it is via the function print(). Further, some aspects of
Command_(computing)
Type of data able to be returned by a function or method
return type of void is used in some programming languages: void sayHello() { printf("Hello, world!"); } A method returns to the code that invoked it when it
Return_type
General-purpose programming language
Python has a "string format" operator % that functions analogously to printf format strings in the C language—e.g. "spam=%s eggs=%d" % ("blah", 2) evaluates
Python_(programming_language)
System call to examine the status of file descriptors of open input/output channels
sizeof(master)); printf("running select()\n"); int nready; if (nready = select(maxfd + 1, &readfds, NULL, NULL, NULL) == -1) { die("select()"); } printf("Number
Select_(Unix)
Software metric used to measure the size of a computer program
ambiguity encountered when determining SLOC: for (int i = 0; i < 100; i++) printf("hello"); /* display one hundred greetings */ In this example we have: 1
Source_lines_of_code
Shell command for scheduling periodic jobs
the default shell for the cron user is Bourne shell compliant: 1 0 * * * printf "" > /var/log/apache/error_log This example runs a shell program called
Cron
Finite state machine compiler
action dgt { printf("DGT: %c\n", fc); } action dec { printf("DEC: .\n"); } action exp { printf("EXP: %c\n", fc); } action exp_sign { printf("SGN: %c\n"
Ragel
Computer programming, a variable accessible throughout a computer program
file-scope variable. printf("%d\n", shared); changeShared(); printf("%d\n", shared); localShadow(); printf("%d\n", shared); paramShadow(1); printf("%d\n", shared);
Global_variable
Notation for ranges or parent directory
as: // prints "numbers 5 10 15" printf("numbers %i %i %i", 5, 10, 15); // prints "input string another string, 0.5" printf("input string %s, %f", "another
Ellipsis (computer programming)
Ellipsis_(computer_programming)
Foreign function interface for the Java language
stdlib = linker.defaultLookup(); MethodHandle printf = linker.downcallHandle( stdlib.findOrThrow("printf"), FunctionDescriptor.of(ValueLayout.JAVA_INT
Java_Native_Interface
Collection of GNU utilities ported to Windows
mkdir mkfifo mknod mv mvdir nl od paste patch pathchk pclip pr printenv printf ptx pwd recode rm rman rmdir sdiff sed seq sh sha1sum shar sleep sort split
UnxUtils
Function with variable number of arguments
variadic function in many languages is output formatting. The C function printf and the Common Lisp function format are two such examples. Both take one
Variadic_function
Part of a computer program where a given name binding is valid
h> int main(void) { char x = 'm'; printf("%c\n", x); { printf("%c\n", x); char x = 'b'; printf("%c\n", x); } printf("%c\n", x); } The program outputs:
Scope_(computer_programming)
Microsoft's core set of application programming interfaces on Windows
their first assignment. The working part of the program is only a single printf line within the main subroutine. The overhead for linking to the standard
Windows_API
Mandatory Paginate or columnate files for printing Version 1 AT&T UNIX printf Shell programming Mandatory Write formatted output 4.3BSD-Reno prs SCCS
List_of_POSIX_commands
Standard library for the C programming language
C functions are also made available in namespace std (e.g., C printf as C++ std::printf, atoi as std::atoi, feof as std::feof), by including header <chdrname>
C_standard_library
Ability of a process to examine and modify itself
(*Method)(void*); // The method: Foo::printHello void Foo_printHello(void* _) { printf("Hello, world!\n"); } // Simulated method table typedef struct { const char*
Reflective_programming
Sorting algorithm
bogoSort(input, size); printf("Sorted result:"); for (size_t i = 0; i < size; i++) { printf(" %d", input[i]); } printf("\n"); return 0; } An implementation
Bogosort
Programming language evaluation rules
args) { Box a = new Box(1); Box b = new Box(2); swap(a, b); System.out.printf("a = %d, b = %d%n", a.value, b.value); // output: a = 2, b = 1 } } where
Evaluation_strategy
Instruction for x86 microprocessors
m0[rip] mov esi, eax call printf xor eax, eax cpuid lea rdi, .m1[rip] mov esi, eax mov r12d, edx mov ebp, ecx call printf mov 3[rsp], ebx lea rsi, 3[rsp]
CPUID
Command line network statistics tool
machine. Some versions of netstat lack explicit field delimiters in their printf-generated output, leading to numeric fields running together and thus corrupting
Netstat
Programming language
:= shp.(Square) // Asserts Square type on shp, should work if ok { fmt.Printf("%#v\n", square) } else { fmt.Println("Can't print shape as Square") } and
Go_(programming_language)
Programming language
(year_size -. float people) /. year_size *. prob in if prob < 0.5 then Printf.printf "answer = %d\n" (people+1) else birthday_paradox prob (people+1) ;;
OCaml
Unary operators that add or subtract one from their operand, respectively
<stdio.h> int main() { int c = 2; printf("%d\n", c++); // this statement displays 2, then c is incremented by 1 to 3. printf("%d", ++c); // this statement
Increment and decrement operators
Increment_and_decrement_operators
Command in Unix-like operating systems
i in {1..9999} ; do printf -- '%010d\t%s\t%s\t%s\n' "$((2*i*(i+1)+1))" "$i" "$((i+1))" ; done) <(for i in {1..9999} ; do printf -- '%010d\t%s\n' "$((i**2))"
Join_(Unix)
Software coverage tool
for (i = 1; i < 10; i++) { if (i % 3 == 0) printf ("%d is divisible by 3\n", i); if (i % 11 == 0) printf ("%d is divisible by 11\n", i); } return 0;
Gcov
Text processing programming language
% 4 == 3 { printf "%6d %s\n", NR, $0 } The action statement prints each line numbered. The printf function emulates the standard C printf and works similarly
AWK
Programming technique to restrict a class to a single instance
} return instance; } public void executeQuery(String sql) { System.out.printf("Executing: %s%n"); } } // a tightly-coupled consumer class class OrderService
Singleton_pattern
Feature of programming languages
sub_task(__async__, void* arg) { int n = (int)(size_t)arg; for (int i = 0; i < 5; ++i) { printf("task %d, delay seconds = %d, i = %d\n", n, n, i); s_task_msleep(__await__
Async/await
C programming language standard, current revision
appear in compound literal definition. Add %b binary conversion specifier to printf() function family. Add %b binary conversion specifier to scanf() function
C23_(C_standard_revision)
Changing an expression from one data type to another
16777217; float my_float = 16777216.0; printf("The integer is: %d\n", my_int); printf("The float is: %f\n", my_float); printf("Their equality: %d\n", my_int ==
Type_conversion
or puts(x) or printf $format$, x or printf($format$, x) STDERR.puts x or STDERR.puts(x) or STDERR.printf $format$, x or STDERR.printf($format$, x) D
Comparison of programming languages (basic instructions)
Comparison_of_programming_languages_(basic_instructions)
Microsoft's implementation of the shared library concept in Windows and OS/2
b); int main(int argc, char *argv[]) { double result = AddNumbers(1, 2); printf("The result was: %f\n", result); return 0; } The following examples show
Dynamic-link_library
Synchronization method in parallel computing
pthread_mutex_destroy(&(bar->lock)); } void *thread_func([[maybe_unused]] void *p) { printf("Thread ID %ld is waiting at barrier, as insufficient (%d) threads are running
Barrier_(computer_science)
Macros whose expansion is guaranteed not to cause the capture of identifiers
{ int a=0; ++i; } int main(void) { int a = 4, b = 8; INCI(a); INCI(b); printf("a is now %d, b is now %d\n", a, b); return 0; } Running the above through
Hygienic_macro
if (c = 'x') return 0; switch (c) { case '\n': case '\r': printf("Newline\n"); default: printf("%c",c); } } return 0; } Splint's output: Variable c used
Splint_(programming_tool)
Container for a set of identifiers
c: #include <stdio.h> #include "Math.h" int main() { printf("sin(0) = %d\n", Math.sin(0)); printf("pi is %f\n", Math.PI); } In C++, a namespace is defined
Namespace
Programming language
get invoked) } } void callback_a() { stdout.printf("Callback A\n"); } void callback_b() { stdout.printf("Callback B\n"); } void main() { var foo = new
Vala_(programming_language)
Extent to which a programming language discourages type errors
integer is something like printf("%d", 12), where the %d tells printf at run-time to expect an integer argument. (Something like printf("%s", 12), which tells
Type_safety
PRINTF
PRINTF
PRINTF
PRINTF
Boy/Male
Gujarati, Hindu, Indian, Kannada, Malayalam, Marathi, Telugu
Moonbeam
Girl/Female
Indian
A gift, A present
Surname or Lastname
English
English : variant spelling of Foulks.
Boy/Male
Tamil
Hetarth | ஹேதாரà¯à®¤Â
Distribute Love, Well wisher
Girl/Female
Arabic, Farsi, Iranian, Muslim
Smart; Deer
Girl/Female
Tamil
Goddess of will, Companion
Boy/Male
Indian
A critic, A reviewer, Fault finder
Boy/Male
Spanish American Latin
Faithful.
Boy/Male
American, Australian, British, English, Hebrew
Son of Adam; Son of the Red Earth; In the Bible God Created Adam-the First Man-out of the Red Earth and Breathed Life into Him
Boy/Male
Tamil
A name of Lord Krishna
PRINTF
PRINTF
PRINTF
PRINTF
PRINTF