Use of static key world in c++

[kashifboy]

i am writing this a program in which i want to calculate the total bill of different products buy by customer. For this purpose i use static key world but it is not working.
My Code Is as Follow:

 
if((ct=='e' || ct=='E')&& (len==1))
   {
        system("cls");
    cout<<'\n';
    cout<<'\n';
    cout<<'\n';
      cout<<"         ! NEW__CUSTOMER_ENTRY !";cout<<'\n';
      cout<<"          ======================";
     cout<<'\n';
     cout<<'\n';
     cout<<'\n';
     cout<<'\n';
     cout<<"Enter Name of Custmer :: ";
     cin>>nam;
     size=strlen(nam);
     infile.seekp(92,ios::beg);
     infile.write(nam,size); 
     cout<<'\n'; 
     cout<<'\n';
     cout<<'\n';
     cout<<'\n';
     cout<<"Enter No of Different Itmes Buy :: ";
     cin>>no;  
     while(j<=no)
     {
     cout<<'\n'; 
     cout<<'\n';
     cout<<'\n'; 
     cout<<"Enter Per Unit Price of ";cout<<j;cout<<" Item :: ";
     cin>>pri;
    cout<<'\n'; 
     cout<<'\n';
     cout<<'\n';
     cout<<"Enter No Of Itmes :: ";
     cin>>qno;cout<<'\n'; 
     cal=pri*qno;  ////cal is static////             
     cout<<cal;         
          j++;    
     }
cout<<cal2=cal+cal;

It just add up the last calculation.
alto in STATIC variable previous value is save but in this case it is not working?

[Bazzy]

Each time you use the assignment operator you change the value of the variable, it doesn't matter how the variable is stored

[kashifboy]

Then please tell me how can i do this?

[sohguanh]

cal=pri*qno; ////cal is static////

The above statement do direct assignment. If you want to add them all up use below.

cal+=(pri*qno);

[kashifboy]

thnx i solve it