#include <iostream>
#include <cmath>
using namespace std;

double f( double x )
{
    double fx = sqrt( abs( sin( x ) ) );
    return( fx );
}

int main()
{
    double x;
    char option;
    
    do {
        cout << "Enter x: ";
        cin >> x;
        cout << "f(x) = " << f(x) << "\n\n";
        cout << "Run again? (y for yes) ";
        cin >> option;
        cout << endl;
    } while ( option == 'y' || option == 'Y' );
    
    cout << "\n\n"; system( "PAUSE" );
    return( 0 );
}