errno is a worldwide variable within the C programming language that shops the error variety of the final library perform name. It’s outlined within the header file `<errno.h>`. For instance:
c #embody #embody int predominant() { FILE *fp = fopen(“myfile.txt”, “r”); if (fp == NULL) { perror(“Error opening file”); return errno; } // Do one thing with the file fclose(fp); return 0; }
