public static double pv(double r, double n, double y, double f, boolean t) {double retval = 0;if (r == 0) {retval = -1*((n*y)+f);}else {double r1 = r + 1;retval =(( ( 1 - Math.pow(r1, n) ) / r ) * (t ? r1 : 1)  * y - f)/Math.pow(r1, n);}return retval;}

public static double pv ( double r , double n , double y , double f , boolean t ) { double retval = 0 ; if ( r == 0 ) { retval = - 1 * ( ( n * y ) + f ) ; } else { double r1 = r + 1 ; retval = ( ( ( 1 - Math . pow ( r1 , n ) ) / r ) * ( t ? r1 : 1 ) * y - f ) / Math . pow ( r1 , n ) ; } return retval ; }
public static double pv(double r, double n, double y, double f, bool t){double retval = 0;if (r == 0){retval = -1 * ((n * y) + f);}else{double r1 = r + 1;retval = (((1 - Math.Pow(r1, n)) / r) * (t ? r1 : 1) * y - f)/Math.Pow(r1, n);}return retval;}
