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#include <stdioh> #include <stdargh>
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void print_message(char *format, );
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int main(void) { print_message(''Cannot open file %s", "test"); return 0; } void print_message(char *format, ) { va_list ptr; /* get an arg ptr */ /* initialize ptr to point to the first argument after the
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This code fragment shows how to set up a call to vprintf( ) The call to va_start( ) creates a variable-length argument pointer to the start of the argument list This pointer must be used in the call to vprintf( ) The call to va_end( ) clears the variable-length argument pointer
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Page 352 format string */ va_start(ptr, format); /* print out message */ vprintf(format, ptr); va_end(ptr); }
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Related Functions vscanf( ), vfscanf( ), vsscanf( ), va_arg( ), va_start( ), and va_end () vscanf, vfscanf, and vsscanf
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#include <stdargh> #include <stdioh> int vscanf(char * restrict format, va_list arg_ptr); int vfscanf(FILE * restrict stream, const char * restrict format, va_list arg_ptr); int vsscanf(char * restrict buf, const char * restrict format, va_list arg_ptr);
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These functions were added by C99 The functions vscanf( ) , vfscanf( ), and vsscanf( ) are functionally equivalent to scanf( ), fscanf( ), and sscanf( ), respectively, except that the argument list has been replaced by a pointer to a list of arguments This pointer must be of type va_list, which is defined in the header <stdargh> Related Functions vprintf( ), vfprintf( ), vsprintf( ), va_arg( ), va_start( ), and va_end( )
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Page 353
14 String and Character Functions
Page 354
The 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 <stringh> The character functions use the header <ctypeh> Because 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, a printable character is one that can be displayed on a terminal In ASCII environments, these are the characters between a space (0 and tilde (0 20) FE) Control characters have values between 0 and 0 and DEL (0 in ASCII environments 1F, 7F) For historical reasons, the arguments to the character functions are integers, but only the low-order byte is used; the character functions automatically convert their arguments to unsigned char Of course, 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 <stringh> defines the size_t type, which is the result of the sizeof operator and is some form of unsigned integer This chapter describes only those functions that operate on characters of type char These are the functions originally defined by Standard 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 19 C99 adds the restrict qualifier to certain parameters of several functions originally defined by C89 When this is the case, the function will be shown using its C89 prototype (which is also the prototype used by C++), but the restrict-qualified parameters will be pointed out in the function's description isalnum
#include <ctypeh> 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 Example This program checks each character read from stdin and reports all alphanumeric characters:
#include <ctypeh> #include <stdioh>
Page 355 int main(void) { char ch; for(;;) { ch = getc(stdin); if(ch == '') break; if(isalnum(ch)) printf(''%c is alphanumeric\n", ch); } return 0; }
Related Functions isalpha( ), iscntrl( ), isdigit( ), isgraph( ) , isprint( ), ispunct( ), and isspace( ) isalpha
#include <ctypeh> 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 Example This program checks each character read from stdin and reports all
#include <ctypeh> #include <stdioh> int main(void) { char ch; for(;;) { ch = getchar(); if(ch == '') break;
Page 356 if(isalpha(ch)) printf("%c is a letter\n", ch); } return 0; }
Related Functions isalnum( ), iscntrl( ), isdigit( ), isgraph( ), isprint( ), ispunct( ), and isspace( ) isblank
#include <ctypeh> int isblank(int ch);
The isblank( ) function was added by C99 The isblank( ) function returns nonzero if ch is a character for which isspace( ) returns true and is used to separate words Thus, for English, the blank characters are space and horizontal tab Example This program checks each character read from stdin and reports the number of characters that separate words:
#include <ctypeh> #include <stdioh> int main(void) { char ch; for(;;) { ch = getchar(); if(ch == '') break; if(isblank(ch)) printf(''%c is a word separator\n", ch); } return 0; }
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