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std::perror

From cppreference.com
< cpp | io | c
Defined in header <cstdio>
void perror( const char *s );

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) [edit]
returns a text version of a given error code
(function) [edit]
C documentation for perror