error_4.c

//Output if there is no error in sys call

#include<stdio.h>
#include<errno.h>
#include<fcntl.h>
#include<string.h>

int main()
{
    int fd = 0;

    fd = open("Demo.txt",O_RDONLY);

    printf("Value of FD : %d\n",fd);

    if(errno != 0)
    {
        printf("Value of errno : %d\n",errno);          //2

        printf("Error statement : %s\n",strerror(errno));
    }

    return 0;
}