#include #include #include #define MAX_LENGHT 78 typedef struct { char id_num[5]; char space; char Name[50]; char Departure[10]; char Arrival[10]; char Day[2]; } PASSENGER; void open_file() { FILE *fp; char s[20]; char s2[]="reservations.txt"; fprintf(stdout,"Write the text file name: "); fgets(s,20,stdin); if (!(strcmp(s,s2)==0)) { s[strlen(s)-1]='\0'; fp=fopen(s,"r"); if (fp==NULL) { fprintf(stderr,"Impossible to open the file %s\n\n",s); exit(1); } else fprintf(stdout,"File opened\n\n"); ...