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std::perror

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< cpp‎ | io‎ | c
Revision as of 17:50, 2 November 2012 by P12bot (Talk | contribs)

 
 
 
 
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

Parameters

s - pointer to a null-terminated string with explanatory message

Return value

(none)

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

See also

Template:cpp/error/dcl list errnoTemplate:cpp/string/byte/dcl list strerror
C documentation for perror