🚀 go-pugleaf

shen@phoenix.cs.uga.edu (Mingzuo Shen) writes:

>    Question No. 2: I read a C++ book intended for Borland C++
>that there is a way to make `cout <<' print more digits for
>doubles. But the book did not give an example. When I tried
>the following, g++ says cout::setprecision is not <something>
>
>    double dtmp;
>    cout.setprecision(16);
>    cout << dtmp;
>
>So how can I get more than 6 significant digits without using
>%16f?

setprecision is an I/O manipulator, not a member function.

	#include <iostream.h>
	#include <iomanip.h>

	int main(void) {
		cout << setprecision(16) << (1/3.0) << endl;
		return 0;
	}

>    Question No. 3. The same book says there is a ws manipulator.
>Does this strip white spaces from the istream? The following did
>not compile under g++:
>
>        char line_input[MAX_LINE_LENGTH];
>        cin.ws();
>        cin.getline(line_input, MAX_LINE_LENGTH);

Use the following:

	#include <iomanip.h>
	...
	cin >> ws;

-- 
Fergus Henderson        |   "People who brook no compromise in programming
                        |   languages should program in lambda calculus or
fjh@munta.cs.mu.OZ.AU   |   machine language, depending." --Andrew Koenig.