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| -rw-r--r-- | README.md | 24 | ||||
| -rw-r--r-- | internal/rpn/variables.go | 8 |
2 files changed, 32 insertions, 0 deletions
@@ -179,6 +179,30 @@ To show the current stack without modifying it: 45 ``` +## Boolean-to-Number Coercion + +Boolean values are automatically coerced to numbers when used in arithmetic operations: +- `true` is treated as `1` +- `false` is treated as `0` + +This enables mixed boolean-numeric expressions: + +```bash +gt 5 3 == 1 + # 5 == 3 is false (0), 0 + 1 = 1 +# → 1 + +gt 0 false + # false is 0, 0 + 0 = 0 +# → 0 + +gt true 2 * # true is 1, 1 * 2 = 2 +# → 2 + +gt 9 3 > 4 5 < + # 9 > 3 is true (1), 4 < 5 is true (1), 1 + 1 = 2 +# → 2 +``` + +Note: The boolean result is shown as `true`/`false` when printed, but when used as an operand it behaves as the corresponding numeric value. + ## Hyper Operators Hyper operators work on all values on the stack simultaneously: diff --git a/internal/rpn/variables.go b/internal/rpn/variables.go index de98e2f..5214403 100644 --- a/internal/rpn/variables.go +++ b/internal/rpn/variables.go @@ -14,6 +14,14 @@ var ( ) // Value represents a variant type that can hold either a number (float64) or a boolean. +// +// When used in arithmetic operations, boolean values are automatically coerced: +// - true → 1 +// - false → 0 +// +// This allows boolean results from comparison operations to be used directly in +// arithmetic expressions (e.g., "5 3 == 1 +" where "5 3 ==" produces false=0, +// and "0 + 1" produces 1). type Value struct { isBool bool boolVal bool |