Unit CALMoneyx;

Interface
Uses
   Windows, SysUtils, Math, ComObj, shellapi, Shlobj;

Function DEBX(y, N, i: double): double;
Function DELJ(y, N, i, G, T: double): double;
Function DBLJ(y, N, i, s, T: double): double;
Function GetMoneyDJ(Money, MLL: double; Months, month: integer;
   Var MBJ, MLC: double): double;

Implementation

Function GetMoneyDJ(Money, MLL: double; Months, month: integer;
   Var MBJ, MLC: double): double;
Begin
   MBJ := roundto(Money / Months, -2);  //月本金
   MLC := roundto((Money - MBJ * (month - 1)) * MLL, -2); //月利息
   result := MBJ + MLC;
End;

Function DEBX(y, N, i: double): double;
Var
   FZ, FM           : double;
Begin
   FZ := y * i * Power(1 + i, N);
   FM := Power(1 + i, N) - 1;
   result := FZ / FM;
End;

Function DELJ(y, N, i, G, T: double): double;
Var
   v, Wb, We        : double;
   T1, T2, T3, T4, T5: double;
Begin
   Wb := T;
   We := 0;
   v := Int((N - Wb) / T) + 1;
   If v < 0 Then Begin
      result := 0;
      Exit;
   End;
   T1 := DEBX(y, N, i);
   T2 := G / (Power(1 + i, N) - 1);
   T3 := Power(1 + i, We);
   T4 := (Power(1 + i, (v + 1) * T) - 1) / (Power(1 + i, T) - 1);
   T5 := v + 1;
   result := T1 - T2 * (T3 * T4 - T5);
End;

Function DBLJ(y, N, i, s, T: double): double;
Var
   We, v, Wb        : double;
   T1, T2, T3, T4, T5, T6, T7: double;
Begin
   If 1 + s = Power(i + 1, T) Then Begin
      result := 0;
      Exit;
   End;
   Wb := T;
   We := 0;
   v := Int((N - Wb) / T) + 1;
   If v < 0 Then Begin
      result := 0;
      Exit;
   End;
   T1 := y * i * Power(1 + i, N);
   T2 := Power(1 + i, v * T + We);
   T3 := Power(1 + i, Wb) - 1;
   T4 := (1 + s) * (Power(1 + i, T) - 1) * Power(i + i, Wb);
   T5 := (Power(1 + i, v * T) - Power(1 + s, v)) / (Power(1 + i, T) - (1 + s));
   T6 := Power(1 + s, v + 1);
   T7 := Power(1 + i, We) - 1;
   result := T1 / (T2 * T3 + T4 * T5 + T6 * T7);
End;

End.