// TestIsPalindrome tests IsPalindrome
func TestIsPalindrome(t *testing.T) {
var tt = []goutils.TTSB{
{"me", false},
{"bob", true},
{"90", false},
{"909", true},
}
for i := 0; i < len(tt); i++ {
testIn := goutils.IsPalindrome(tt[i].Test)
testExp := tt[i].Expt
if testIn != testExp {
t.Error("IsPalindrome test failed")
}
}
}
// Euler4 solution
func Euler4(p int) string {
p--
upperL := int(math.Pow(10, float64(p))) - 1
p--
lowerL := int(math.Pow(10, float64(p)))
for j := upperL; j > lowerL; j-- {
for k := upperL; k > lowerL; k-- {
prod := strconv.Itoa(j * k)
if goutils.IsPalindrome(prod) {
str := []string{strconv.Itoa(j), ",", strconv.Itoa(k)}
nums := strings.Join(str, "")
return nums
}
}
}
return ""
}