Full prototype:
void perror(const char*);
Purpose and Notes:
Prints the string passed in as the first argument followed by a colon, a space, and the string asscoiated with the current value of errno and a newline to the standard error stream.
If the string passed in is NULL then it just prints the string associated with errno.
Returns:
void- Nothing.
Argument 1:
const char*- A custom string to print before a colon:, space and the string associated with the current value of errno.