oke,
Here the code :
Code:
#include <iomanip>
#include <ios>
#include <iostream>
#include <string>
using namespace std ;
int main()
{
// ask for and read the student's name
cout << "Please enter your first name: ";
string name;
cin >> name;
cout << "Hello, " << name << "!" << endl;
// ask for and read the midterm and final grades
cout << "Please enter your midterm and final exam grades: ";
double midterm, final;
cin >> midterm >> final;
// ask for the homework grades
cout << "Enter all your homework grades, "
"followed by end-of-file: ";
// the number and sum of grades read so far
int count = 0;
double sum = 0;
// a variable into which to read
double x;
// invariant:
// we have read `count' grades so far, and
// `sum' is the sum of the first `count' grades
while (cin >> x)
{
++count;
sum += x;
}
while (count == 0 )
{
cin.ignore (1000, '\n');
cout <<"You haven't entered any values" << endl;
cout << endl ;
cout << "Enter all your homework grades, "
"followed by end-of-file: ";
// invariant:
// we have read `count' grades so far, and
// `sum' is the sum of the first `count' grades
while (cin >> x)
{
++count;
sum += x;
}
}
// write the result
streamsize prec = cout.precision();
cout << "Your final grade is " << setprecision(3)
<< 0.2 * midterm + 0.4 * final + 0.4 * sum / count
<< setprecision(prec) << endl;
return 0;
}
Roelof