double variables

[Travis Davies <tddavies@yahoo.com>]

how can I cout the value of a double with setprecision
in c++ without the number being rounded at all.
for example: 

#include <iostream>
#include <iomanip>

using namespace std;
main(){

double num = 8.5732;

cout << setprecision(3) << num;

return 0;
}

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