[Go] Functions with returning values.

package main

import (
    "log"
    "math"
)

func add(a float64, b float64) float64 {
    return a + b
}

func main() {
    if !(math.Abs(add(3, 2)-5.0) < (1.0 / 1000000)) {
        log.Fatal("Wrong value")
    }
}