C/stdio.h/perror

perror: maps error message to the global variable errno and outputs that string to stderr

<source lang="cpp">

//Header file: #include <stdio.h> //Declaration: void perror(const char *str);

 #include <stdio.h>
 #include <stdlib.h>
 int main(void)
 {
   perror("File error ");
 }
        

/* File error : No Error

• /

      </source>