A few things that stand out are:
-You're reading a file but what are you actually doing with it?
if ((response1 == o)&& (response2 == u))
Those letters should be surrounded with apostrophes like so 'o' 'u'
-Are those nested if statements actually what you want? I don't think so.
I don't know, have a look at the code below....
#include <iostream>
#include <fstream>
#include <iomanip>
#include <cstdlib>
#include <cmath>
using namespace std;
int main()
{
string filename = "registration fee.txt";
ifstream inFile;
int n;
double fee;
char response1, response2;
char i, o, u, g;
inFile.open ( "registration fee.txt" );
cout << "please enter your status of residence,type i or o" << endl;
cin >> response1;
cout << "please enter your status of study,type u or g" << endl;
cin >> response2;
cout << "please enter your number of credits" << endl;
cin >> n;
i = 0;
u = 0;
if ( ( response1 == 'i' ) && ( response2 == 'u' ) )
{
if ( n < 12 )
{
fee = ( ( 280 * n * 0.35 ) + ( 43 * n ) );
cout << "status of residence : " << response1 << endl;
cout << "status of study : " << response2 << endl;
cout << "number of credits : " << endl;
cout << fee << endl;
}
else if ( n >= 12 )
{
fee = ( ( 280 * n * 0.35 ) + ( 43 * 12 ) );
cout << "status of residence : " << response1 << endl;
cout << "status of study : " << response2 << endl;
cout << "number of credits : " << endl;
cout << fee << endl;
}
}
g = 0;
if ( ( response1 == 'i' ) && ( response2 == 'g' ) )
{
if ( n < 9 )
{
fee = ( 400 * n * 0.35 ) + ( 43 * n ) + 10;
cout << "status of residence : " << response1 << endl;
cout << "status of study : " << response2 << endl;
cout << "number of credits : " << endl;
cout << fee << endl;
}
else if ( n >= 9 )
{ fee = ( 400 * n * 0.35 ) + ( 43 * 9 ) + 10;
cout << "status of residence : " << response1 << endl;
cout << "status of study : " << response2 << endl;
cout << "number of credits : " << endl;
cout << fee << endl;
}
}
o = 1;
if ( ( response1 == 'o' ) && ( response2 == 'u' ) )
{
if ( n < 12 )
{
fee = ( 280 * n ) + ( 43 * n );
cout << "status of residence : " << response1 << endl;
cout << "status of study : " << response2 << endl;
cout << "number of credits : " << endl;
cout << fee << endl;
}
else if ( n >= 12 )
{
fee = ( 280 * n ) + ( 43 * 12 );
cout << "status of residence : " << response1 << endl;
cout << "status of study : " << response2 << endl;
cout << "number of credits : " << endl;
cout << fee << endl;
}
}
if ( ( response1 == 'o' ) && ( response2 == 'g' ) )
{
if ( n < 9 )
{
fee = ( 400 * n * 0.35 ) + ( 43 * n ) + 10;
cout << "status of residence : " << response1 << endl;
cout << "status of study : " << response2 << endl;
cout << "number of credits : " << endl;
cout << fee << endl;
}
else if ( n >= 9 )
{ fee = ( 400 * n * 0.35 ) + ( 43 * 9 ) + 10;
cout << "status of residence : " << response1 << endl;
cout << "status of study : " << response2 << endl;
cout << "number of credits : " << endl;
cout << fee << endl;
}
}
inFile.close();
system ( "pause" );
return 0;
}
