math

func Abs ¶

func Abs(a int) int

Abs returns an absolute value of a.

func ModMul ¶

func ModMul(a, b, mod int) int

ModMul returns the result of modulus division on a*b.

func ModPow ¶

func ModPow(a, b, mod int) int

ModPow returns the result of modulus division on a^b. If b is -1, it returns the modular inverse of a.

func Pow ¶

func Pow(a, b int) int

Pow returns a^b using POW VM opcode. b must be >= 0 and <= 2^31-1.

func Sign ¶

func Sign(a int) int

Sign returns:

-1 if x <  0
 0 if x == 0
+1 if x >  0

func Sqrt ¶

func Sqrt(x int) int

Sqrt returns a positive square root of x rounded down.

func Within ¶

func Within(x, a, b int) bool

Within returns true if a <= x < b.