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#include "airlines.h"
 
int main(){
 
  FILE *airports,*flights,*routes;
  int *option, a;
 
  airports=fopen("airports.txt", "r");
  flights=fopen("flights.txt", "r");
  routes=fopen("routes.txt", "r");
 
  if ( (airports == NULL) || (flights == NULL) || (routes == NULL)) {
    fprintf(stderr, "Can't open input file in.list!\n");
  } else{
 
    a=5;
 
    option = &a;
    *option = prompt();
 
    if ( check_input(*option)== TRUE ){
      if(*option != '5'){
        printf("Enter option:  %d\n", *option);
      }
    }else {
      printf("Incalid option.  Try again.\n");
    }
 
  }
}
 

prog.cpp:2:22: error: airlines.h: No such file or directory
prog.cpp: In function ‘int main()’:
prog.cpp:6: error: ‘FILE’ was not declared in this scope
prog.cpp:6: error: ‘airports’ was not declared in this scope
prog.cpp:6: error: ‘flights’ was not declared in this scope
prog.cpp:6: error: ‘routes’ was not declared in this scope
prog.cpp:9: error: ‘fopen’ was not declared in this scope
prog.cpp:13: error: ‘NULL’ was not declared in this scope
prog.cpp:14: error: ‘stderr’ was not declared in this scope
prog.cpp:14: error: ‘fprintf’ was not declared in this scope
prog.cpp:20: error: ‘prompt’ was not declared in this scope
prog.cpp:22: error: ‘check_input’ was not declared in this scope
prog.cpp:22: error: ‘TRUE’ was not declared in this scope
prog.cpp:24: error: ‘printf’ was not declared in this scope
prog.cpp:27: error: ‘printf’ was not declared in this scope

Standard output is empty