C Plus Plus Project : Quiz

Cpp Project: quiz  

 #include<iostream>  
 #include<stdlib.h>  
 #include<fstream>  
 using namespace std;  
 class contest  
 {  
 private:  
   char roll[10];  
   float x;  
   char name[20];  
   char s[100],ans;  
 public:  
   contest()  
   { x=0; };  
   void init();  
   void define();  
   void display();  
 };  
 void contest :: define()  
 {  
   ifstream in;  
   char a;  
    int i=1;  
   in.open("quiz.txt");  
   while(in.eof()==0)  
   {  
   in.getline(s,100);  
   cout<<endl<<s;  
   if(i==5)  
   {  
   in.get(a);  
   cout<<"\nans:";  
   cin>>ans;  
   i=-1;  
   if(ans==a)  
     {  
     x=x+5;  
     cout<<" *Your ans correct.\n";  
     }  
   else  
     {  
     if(x>0)  
     x=x-2.5;  
     cout<<" # Wrong ans.\n";  
     }  
   }  
   i++;  
   }  
   in.close();  
 }  
    void contest :: init()  
     {  
    cout<<"\t\t\t  Examinee Name:";  
    cin>>name;  
    cout<<"\t\t\t  Examinee roll:";  
    cin>>roll;  
     }  
    void contest :: display()  
     {  
    cout<<"\n **Result:\n";  
    cout<<"\t"<<name<<" you got total "<<x<<" marks,out of 25.\n";  
     }  
 int main()  
 {  
   contest r;  
   system("color F9");  
   cout<<"   \t\t\t~~~*** QUIZ CONTEST ***~~~\t   Total Marks:25\n\n";  
   r.init();  
   cout<<"\t*5 marks per Ques(half negative marking for wrong ans)";  
     L:  
   cout<<"\n\n\tselect your choice:\n"  
     <<"\n\t1 for start exam:"  
     <<"\n\t0 for quit the exam :";  
     int c;  
     cin>>c;  
     switch(c)  
     {  
     case 1:  
     r.define();  
     r.display();  
     break;  
     case 0:  
     exit(1);  
     default:  
     cout<<"invalid choice!";  
     goto L;  
     }  
 }