How can I implement a variable field width with printf? []

How can I print numbers with commas separating the thousands? []

Why doesn't the call scanf("%d", i) work? []

How can I specify a variable width in a scanf format string? []

When I read numbers from the keyboard with scanf "%d\n", it seems to hang until I type one extra line of input. []

I'm reading a number with scanf %d and then a string with gets(), but the compiler seems to be skipping the call to gets()! []

I'm re-prompting the user if scanf fails, but sometimes it seems to go into an infinite loop. []

Why does everyone say not to use scanf? What should I use instead? []

How can I tell how much destination buffer space I'll need for an arbitrary sprintf call? How can I avoid overflowing the destination buffer with sprintf? []

Why does errno contain ENOTTY after a call to printf? []

How can I convert numbers to strings? []

I heard that you have to #include <stdio.h> before calling printf. Why? []

Why don't function prototypes guard against mismatches in printf's arguments? []

How can I write a function that takes a format string and a variable number of arguments, like printf, and passes them to printf to do most of the work? []

How can I write a function analogous to scanf, that calls scanf to do most of the work? []

Questions and Answers

printf - A printf program {oss}

number - Arabic numerals to multi-lingual natural language {oss}

a64l l64a (3) - convert between 32-bit integer and radix-64 ASCII string {oss}

atoi (3) - convert ASCII string to integer {oss}

atol (3) - convert ASCII string to long integer {oss}

strtol strtoq (3) - convert string value to a long or quad_t integer {oss}

strtoul strtouq (3) - convert a string to an unsigned long or uquad_t {oss}

scanf fscanf sscanf vscanf vsscanf vfscanf (3) - input format conversion {oss}

printf fprintf sprintf snprintf asprintf asnprintf vprintf vfprintf vsprintf vsnprintf vasprintf vansprintf (3) - formatted output conversion {oss}

strerror (3) - get error message string {oss}

strsignal (3) - get signal description string {oss}

trio-1.3 - A fully matured and stable set of printf and string functions

p5-String-Scanf-1.4 - Emulates the sscanf() of the C stdio library

L2Roman.C - Convert long integers to roman numerals {oss}

Roman2L.C - Convert roman numerals to long integers {oss}

Bitstrng.C - Print binary formatted strings {oss}

Bstr_I.C - Convert binary string to int {oss}

Rdxcnvrt.C - Convert between number bases {oss}

Numcnvrt.H - Header for SNIPPETS numerical <=> string conversions {oss}

Bascnvrt.C - Convert radix of a numeric string {oss}

Commafmt.C - Format long integers using commas {oss}

Fmtmoney.C - Format US dollar amounts into text strings {oss}

Hexorint.C - Auto-convert hex or decimal strings {oss}

Hstr_I.C - Convert hex string to int {oss}

Ltoa.C - Convert long to a string {oss}

Ltostr.C - A safer version of ltoa() {oss}

Ord_Text.C - Format ordinal numbers in English {oss}

number - Arabic numerals to multi-lingual natural language {oss}

Roman - Convert from Arabic (normal) numbers to Roman numbers and back. [Perl] {oss}

String::Scanf - Emulate C's sscanf() function, which extracts and assigns values from a string. [Perl] {oss}

Libraries and Functions

(The following links to subjects at this site retain your personalized selections.)

Up to Text Strings - Gateway topic to character and string processing routines. NUL Terminated String processing String conversions,et al. ascii to long, long to