std::perror
From cppreference.com
| Defined in header <cstdio>
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| void perror( const char *s ); |
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Prints to stderr the contents of the null-terminated character string pointed to by s (unless s is a null pointer), followed by the two characters ": ", followed by the implementation-defined error message describing the error code currently stored in the system variable errno (identical to the output of std::strerror(errno)), followed by '\n'.
Contents |
[edit] Parameters
| s | - | pointer to a null-terminated string with explanatory message |
[edit] Return value
(none)
[edit] Example
#include <cmath> #include <cerrno> #include <cstdio> int main() { double not_a_number = std::log(-1.0); if (errno == EDOM) { std::perror("log(-1) failed"); } }
Output:
log(-1) failed: Numerical argument out of domain
[edit] See also
| macro which expands to POSIX-compatible thread-local error number variable (macro variable) | |
| returns a text version of a given error code (function) | |
| C documentation for perror
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