?? ex7_11.cpp
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/* Code for exercise 7.11. | | "C++ Solutions--Companion to The C++ Programming Language, Third Edition" | by David Vandevoorde; Addison-Wesley 1998; ISBN 0-201-30965-3. | | Permission to use, copy, modify, distribute and sell this software | and its documentation for any purpose is hereby granted without fee. | The author makes no representations about the suitability of this | software for any purpose. It is provided "as is" without express or | implied warranty. `----------------------------------------------------------------------*/#include <assert.h>#include <stdarg.h>#include <iostream.h>#include <stdexcept>void error(char const *fmt, ...) { assert(fmt); va_list p; va_start(p, fmt); for (char const *s = fmt; *s; ++s) if (*s!='%') std::cerr.put(*s); else switch (*(++s)) { case '%': std::cerr.put('%'); break; case 's': std::cerr << va_arg(p, char const*); break; case 'c': std::cerr << va_arg(p, char); break; case 'd': std::cerr << va_arg(p, int); break; default: throw std::domain_error(std::string ("panic")); } va_end(p);}int main() { error("A string \"%s\", a single character \'%c\', an integer %d\n" "and a percent-symbol \'%%\'.\n", "Hello World", '$', 12345); return 0;}
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