THE STANDARD FUNCTION LIBRARY in .NET framework

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THE STANDARD FUNCTION LIBRARY
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ungetc
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#include <cstdio> int ungetc(int ch, FILE *stream);
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The ungetc( ) function returns the character specified by the low-order byte of ch to the input stream stream This character will then be obtained by the next read operation on stream A call to fflush( ), fseek( ), or rewind( ) undoes an ungetc( ) operation and discards the character A one-character pushback is guaranteed; however, some implementations will accept more You may not unget an EOF A call to ungetc( ) clears the end-of-file flag associated with the specified stream The value of the file position indicator for a text stream is undefined until all pushed- back characters are read, in which case it will be the same as it was prior to the first ungetc( ) call For binary streams, each ungetc( ) call decrements the file position indicator The return value is equal to ch on success and EOF on failure
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C++: The Complete Reference
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A related function is getc( )
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vprintf, vfprintf, and vsprintf
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#include <cstdarg> #include <cstdio> int vprintf(char *format, va_list arg_ptr); int vfprintf(FILE *stream, const char *format, va_list arg_ptr); int vsprintf(char *buf, const char *format, va_list arg_ptr);
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The functions vprintf( ), vfprintf( ), and vsprintf( ) are functionally equivalent to printf( ), fprintf( ), and sprintf( ), respectively, except that the argument list has been replaced by a pointer to a list of arguments This pointer must be of type va_list, which is defined in the header <cstdarg> (or the C header file stdargh) Related functions are va_arg( ), va_start( ), and va_end( )
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The String and Character Functions
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C++: The Complete Reference
he standard function library has a rich and varied set of string and character handling functions The string functions operate on null-terminated arrays of characters and require the header <cstring> The character functions use the header <cctype> C programs must use the header files stringh and ctypeh Because C/C++ has no bounds checking on array operations, it is the programmer's responsibility to prevent an array overflow Neglecting to do so may cause your program to crash In C/C++, a printable character is one that can be displayed on a terminal These are usually the characters between a space (0x20) and tilde (0xFE) Control characters have values between (0) and (0x1F) as well as DEL (0x7F) For historical reasons, the parameters to the character functions are integers, but only the low-order byte is used; the character functions automatically convert their arguments to unsigned char However, you are free to call these functions with character arguments because characters are automatically elevated to integers at the time of the call The header <cstring> defines the size_t type, which is essentially the same as unsigned This chapter describes only those functions that operate on characters of type char These are the functions originally defined by Standard C and C++, and they are by far the most widely used and supported Wide-character functions that operate on characters of type wchar_t are discussed in 31
isalnum
#include <cctype> int isalnum(int ch);
The isalnum( ) function returns nonzero if its argument is either a letter of the alphabet or a digit If the character is not alphanumeric, zero is returned Related functions are isalpha( ), iscntrl( ), isdigit( ), isgraph( ), isprint( ), ispunct( ), and isspace( )
isalpha
#include <cctype> int isalpha(int ch);
The isalpha( ) function returns nonzero if ch is a letter of the alphabet; otherwise zero is returned What constitutes a letter of the alphabet may vary from language to language For English, these are the upper- and lowercase letters A through Z
26:
The String and Character Functions
Related functions are isalnum( ), iscntrl( ), isdigit( ), isgraph( ), isprint( ), ispunct( ), and isspace( )
iscntrl
#include <cctype> int iscntrl(int ch);
The iscntrl( ) function returns nonzero if ch is between zero and 0x1F or is equal to 0x7F (DEL); otherwise zero is returned Related functions are isalnum( ), isalpha( ), isdigit( ), isgraph( ), isprint( ), ispunct( ), and isspace( )
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