DOUBLE - QB64 Wiki


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DOUBLE type floating point numerical values use 8 bytes per value.


DIM variable AS DOUBLE


  • Literal or variable values can range up to 15 decimal point places.
  • Qbasic variable suffix type is #. The IDE may add the suffix after literal values.
  • Results of mathematical calculations may be approximate or slow in Quickbasic 4.5.
  • Use DOUBLE and _FLOAT variables SPARINGLY! They use a lot of program memory.
  • Values returned may be expressed using exponential or scientific notation using E for SINGLE or D for DOUBLE precision.
  • Floating decimal point numerical values cannot be _UNSIGNED!
  • Values can be converted to 8 byte ASCII string values using _MKD$ and back with _CVD.
  • When a variable has not been defined or has no type suffix, the value defaults to SINGLE.
  • Warning: Qbasic keyword names cannot be used as numerical variable names with or without the type suffix!

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