c++ - list not displaying from txt file - 


void main() {     nodlista* ls=null;     file* f=fopen("asaceva.txt","r");     if(f!=null) {         char buffer[100]; int id;float pret;         fscanf(f,"d",&id);         while(!feof(f)) {             fscanf(f,"f",&pret);             fscanf(f,"s",buffer);             produs* p= creareprodus(id,pret,buffer);             ls=inseraresfarsit(ls,*p);             fscanf(f,"%d",&id);         }         afisarelista(ls);     }     _getch(); }
  • afisarelista: displays list
  • inseraresfarsit: inserts @ end

i don't understand why doesn't data txt file. can explain why?

there couple of issues in code:

  • main not returning integer.
  • not using fscanf consistently , correctly placeholders.
  • you not checking return value of fscanf failure.
  • null should replaced nullptr if have c++11 support available.

the correct code should this:

int main() {     nodlista* ls=null;     file* f=fopen("asaceva.txt","r");     if(f!=null) {         char buffer[100]; int id;float pret;         if (!fscanf(f,"%d",&id))             cout << "error happened: " << ferror(f) << ", error string: " << strerror(errno) << endl;         while(!feof(f)) {             if (!fscanf(f,"%f",&pret))                 cout << "error happened: " << ferror(f) << ", error string: " << strerror(errno) << endl;             if (!fscanf(f,"%s",buffer))                 cout << "error happened: " << ferror(f) << ", error string: " << strerror(errno) << endl;             produs* p= creareprodus(id,pret,buffer);             ls=inseraresfarsit(ls,*p);             if (!fscanf(f,"%d",&id))                 cout << "error happened: " << ferror(f) << ", error string: " << strerror(errno) << endl;         }         afisarelista(ls);     }     _getch();     return 0; }

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