Error Handling with errno and perror in C

 Error Handling with errno and perror in C

The errno variable is set by system calls and library functions to indicate errors. The perror function can be used to print a descriptive error message based on the value of errno.

#include <stdio.h>

#include <stdlib.h>

#include <errno.h>

int main() {

    FILE* file = fopen("nonexistent.txt", "r");

    if (file == NULL) {

        perror("Error");

        printf("Error code: %d\n", errno);

        return 1;

    }

    // Code to work with the file

    fclose(file);

    return 0;

}