C Language Zemi

stderr-a pointer to a FILE structure that means standard error stream

stderr is a pointer to the FILE structure, which means standard error stream. The standard error stream is automatically opened at the start of the program. Standard error stream generally means the output of errors to the screen. You can use it by reading the stdio.h header.

#include <stdio.h>

stderr

stderr is implemented as an expression in the C language specification. stderr can be implemented as a global variable or a macro.

Sample using stderr

This is a sample using stderr. The fprintf function specifies the standard error as the output destination.

#include <stdio.h>

int main (void) {
  const char * message = "Hello";
  fprintf (stderr, "%s\n", message);
}

This is the execution result. "Hello" is displayed on the screen.

Hello