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Showing content from https://en.cppreference.com/w/cpp/language/../algorithm/../../cpp/../c/io/perror.html below:

perror - cppreference.com

void perror( const char *s );

Prints a textual description of the error code currently stored in the system variable errno to stderr.

The description is formed by concatenating the following components:

• the contents of the null-terminated byte string pointed to by s, followed by ": " (unless s is a null pointer or the character pointed to by s is the null character)
• implementation-defined error message string describing the error code stored in errno, followed by '\n'. The error message string is identical to the result of strerror(errno).

(none)

#include <stdio.h>
 
int main(void)
{
    FILE *f = fopen("non_existent", "r");
    if (f == NULL) {
        perror("fopen() failed");
    } else {
        fclose(f);
    }
}

Possible output:

fopen() failed: No such file or directory

• C11 standard (ISO/IEC 9899:2011):

• 7.21.10.4 The perror function (p: 339)

• C99 standard (ISO/IEC 9899:1999):

• 7.19.10.4 The perror function (p: 305)

• C89/C90 standard (ISO/IEC 9899:1990):

• 4.9.10.4 The perror function

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