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Use ** for power/exponentiation.

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This commit is contained in:
Stephen Chung
2021-02-10 12:41:27 +08:00
parent 8c26b49a39
commit 61638d6566
6 changed files with 67 additions and 53 deletions
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30
tests/power_of.rs
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@@ -10,18 +10,20 @@ const EPSILON: FLOAT = 0.000_001;
fn test_power_of() -> Result<(), Box<EvalAltResult>> {
let engine = Engine::new();
assert_eq!(engine.eval::<INT>("2 ~ 3")?, 8);
assert_eq!(engine.eval::<INT>("(-2 ~ 3)")?, -8);
assert_eq!(engine.eval::<INT>("2 ** 3")?, 8);
assert_eq!(engine.eval::<INT>("(-2 ** 3)")?, -8);
assert_eq!(engine.eval::<INT>("2 ** 3 ** 2")?, 512);
#[cfg(not(feature = "no_float"))]
{
assert!(
(engine.eval::<FLOAT>("2.2 ~ 3.3")? - 13.489_468_760_533_386 as FLOAT).abs() <= EPSILON
(engine.eval::<FLOAT>("2.2 ** 3.3")? - 13.489_468_760_533_386 as FLOAT).abs()
<= EPSILON
);
assert!((engine.eval::<FLOAT>("2.0~-2.0")? - 0.25 as FLOAT).abs() < EPSILON);
assert!((engine.eval::<FLOAT>("(-2.0~-2.0)")? - 0.25 as FLOAT).abs() < EPSILON);
assert!((engine.eval::<FLOAT>("(-2.0~-2)")? - 0.25 as FLOAT).abs() < EPSILON);
assert_eq!(engine.eval::<INT>("4~3")?, 64);
assert!((engine.eval::<FLOAT>("2.0**-2.0")? - 0.25 as FLOAT).abs() < EPSILON);
assert!((engine.eval::<FLOAT>("(-2.0**-2.0)")? - 0.25 as FLOAT).abs() < EPSILON);
assert!((engine.eval::<FLOAT>("(-2.0**-2)")? - 0.25 as FLOAT).abs() < EPSILON);
assert_eq!(engine.eval::<INT>("4**3")?, 64);
}
Ok(())
@@ -31,26 +33,26 @@ fn test_power_of() -> Result<(), Box<EvalAltResult>> {
fn test_power_of_equals() -> Result<(), Box<EvalAltResult>> {
let engine = Engine::new();
assert_eq!(engine.eval::<INT>("let x = 2; x ~= 3; x")?, 8);
assert_eq!(engine.eval::<INT>("let x = -2; x ~= 3; x")?, -8);
assert_eq!(engine.eval::<INT>("let x = 2; x **= 3; x")?, 8);
assert_eq!(engine.eval::<INT>("let x = -2; x **= 3; x")?, -8);
#[cfg(not(feature = "no_float"))]
{
assert!(
(engine.eval::<FLOAT>("let x = 2.2; x ~= 3.3; x")? - 13.489_468_760_533_386 as FLOAT)
(engine.eval::<FLOAT>("let x = 2.2; x **= 3.3; x")? - 13.489_468_760_533_386 as FLOAT)
.abs()
<= EPSILON
);
assert!(
(engine.eval::<FLOAT>("let x = 2.0; x ~= -2.0; x")? - 0.25 as FLOAT).abs() < EPSILON
(engine.eval::<FLOAT>("let x = 2.0; x **= -2.0; x")? - 0.25 as FLOAT).abs() < EPSILON
);
assert!(
(engine.eval::<FLOAT>("let x = -2.0; x ~= -2.0; x")? - 0.25 as FLOAT).abs() < EPSILON
(engine.eval::<FLOAT>("let x = -2.0; x **= -2.0; x")? - 0.25 as FLOAT).abs() < EPSILON
);
assert!(
(engine.eval::<FLOAT>("let x = -2.0; x ~= -2; x")? - 0.25 as FLOAT).abs() < EPSILON
(engine.eval::<FLOAT>("let x = -2.0; x **= -2; x")? - 0.25 as FLOAT).abs() < EPSILON
);
assert_eq!(engine.eval::<INT>("let x =4; x ~= 3; x")?, 64);
assert_eq!(engine.eval::<INT>("let x =4; x **= 3; x")?, 64);
}
Ok(())