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Showing content from https://cplusplus.com/reference/cstring/strerror/ below:

function

strerror

char * strerror ( int errnum );

Get pointer to error message string

Interprets the value of errnum, generating a string with a message that describes the error condition as if set to errno by a function of the library.

The returned pointer points to a statically allocated string, which shall not be modified by the program. Further calls to this function may overwrite its content (particular library implementations are not required to avoid data races).

The error strings produced by strerror may be specific to each system and library implementation.

Parameters

errnum: Error number.

Return Value A pointer to the error string describing error errnum.

Example

/* strerror example : error list */
#include <stdio.h>
#include <string.h>
#include <errno.h>

int main ()
{
  FILE * pFile;
  pFile = fopen ("unexist.ent","r");
  if (pFile == NULL)
    printf ("Error opening file unexist.ent: %s\n",strerror(errno));
  return 0;
}

Possible output:

Error opening file unexist.ent: No such file or directory