软件工程课堂练习购买图书

#include <iostream>
#include <iomanip>
using namespace std;
int main() {
const float discount[10] = {0,0,0.1,0.3,0.8,1.25,1.25,1.35,1.6,2.05};
int count;
cout << "输入购书数量：";
cin >> count;
if (count < 0)
{
cout << "Error ! Illegal Input" << endl;
exit(1);
}
float result = (count / 10)* 2.5 + discount[count % 10];
cout << "优惠" <<setiosflags(ios::fixed)<<setprecision(2)<< 8 * result << endl;
}