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DDB# returns the depreciation of an asset for a specific period using the
double-declining-balance method.
 
DDB# (cost#, salvage#, life#, period#, status%)
    ■ The arguments life# and period# must use the same units. If
      life# is given in months, period# also must be given in months.
    ■ The argument status% can be any variable that returns information
      about the success or failure of the calculation. The value of status%
      will be 0 if the calculation was successful, and 1 if it was not.
 
Usage Notes
    ■ The double-declining balance-method computes depreciation at an
      accelerated rate. Depreciation is highest in the first period and
      decreases in successive periods.
    ■ The formula for DDB# is described in the BASIC Language Reference
      manual.
 
Important
    ■ To use DDB# in the QBX environment, use the FINANCER.QLB Quick
      library. To use DDB# outside the QBX environment, link your program
      with the appropriate FINANCxx.LIB file. Depending on the compiler
      options you chose when you installed BASIC, one or more of the
      following files will be available:
 
         Filename         Compiler options
         ════════════     ═════════════════════════════════════════════
         FINANCER.LIB     80x87 or emulator math; DOS or OS/2 real mode
         FINANCAR.LIB     Alternate math; DOS or OS/2 real mode
         FINANCEP.LIB     80x87 or emulator math; OS/2 protected mode
         FINANCAP.LIB     Alternate math; OS/2 protected mode
 
    ■ The FINANC.BI header file contains the necessary function
      declarations for DDB#.
    ■ For more information on using libraries, see "Creating and Using
      Quick Libraries" and "Using LINK and LIB" in the BASIC Programmer's
      Guide.