C++/Console/cout setw setprecision — различия между версиями
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Версия 14:21, 25 мая 2010
Содержание
Cout: precision 4
#include <iostream>
using namespace std;
int main()
{
cout.precision(4);
cout << 10.0/3.0 << "\n";
return 0;
}
Demonstrate an I/O manipulator: setprecision(2) and setw(20)
#include <iostream>
#include <iomanip>
using namespace std;
int main()
{
cout << setprecision(2) << 1000.243 << endl;
cout << setw(20) << "Hello there.";
return 0;
}
Enters a character and outputs its octal, decimal, and hexadecimal code.
#include <iostream>
#include <iomanip>
#include <string>
using namespace std;
int main()
{
int number = " ";
cout << "The white space code is:" << number << "." << endl;
char ch;
string prompt = "Please enter a character followed by <return>: ";
cout << prompt;
cin >> ch;
number = ch;
cout << "The character " << ch << " has code" << number << endl;
cout << uppercase // For hex-digits
<< " octal decimal hexadecimal\n "
<< oct << setw(8) << number
<< dec << setw(8) << number
<< hex << setw(8) << number << endl;
return 0;
}
Uses I/O manipulators to display the table of squares and square roots.
#include <iostream>
#include <iomanip>
#include <cmath>
using namespace std;
int main()
{
double x;
cout << setprecision(4);
cout << " x sqrt(x) x^2\n\n";
for(x = 2.0; x <= 20.0; x++) {
cout << setw(7) << x << " ";
cout << setw(7) << sqrt(x) << " ";
cout << setw(7) << x*x << "\n";
}
return 0;
}