Accelerated C++ Exercise 4-4

#include<iostream>#include<iomanip>using std::cout;using std::cin;using std::setw;using std::endl;using std::streamsize;using std::setprecision;int digits(double n,int places){int result=places;while(n>=1){++result;n/=10;}return result;}int main(){const double max_base = 99.9;int max_base_width = digits(max_base, 2);int max_result_width = digits(max_base * max_base, 2);for (double i = 1; i <= max_base; i += 0.1)   {   streamsize prec= cout.precision();      cout << setw(max_base_width + 2) <<         setprecision(max_base_width) << i         << setw(max_result_width + 2) << setprecision(max_result_width) << (i * i) <<setprecision(prec)<< endl;   }system("pause");return 0;}