diff --git a/convert.go b/convert.go
new file mode 100644
index 0000000..6d16eca
--- /dev/null
+++ b/convert.go
@@ -0,0 +1,88 @@
+package q5
+
+import (
+	"strconv"
+	"strings"
+)
+
+// ToInt converts a value to an integer.
+func ToInt[T string | int | int64 | float32 | float64](value T) int {
+	var x interface{} = value
+	switch i := x.(type) {
+	case int:
+		return i
+	case int64:
+		return int(i)
+	case float32:
+		return int(i)
+	case float64:
+		return int(i)
+	case string:
+		intValue, err := strconv.Atoi(i)
+		if err != nil {
+			return 0
+		}
+		return intValue
+	}
+
+	return 0
+}
+
+// ToInt64 converts a value to an int64.
+func ToInt64[T string | int | int64 | float32 | float64](value T) int64 {
+	var x interface{} = value
+	switch i := x.(type) {
+	case int:
+		return int64(i)
+	case int64:
+		return i
+	case float32:
+		return int64(i)
+	case float64:
+		return int64(i)
+	case string:
+		intValue, err := strconv.ParseInt(i, 10, 64)
+		if err != nil {
+			return 0
+		}
+		return intValue
+	}
+	return 0
+}
+
+// ToFloat converts a value to a float64.
+func ToFloat[T string | int | int64 | float32 | float64](value T) float64 {
+	var x interface{} = value
+	switch i := x.(type) {
+	case int:
+		return float64(i)
+	case int64:
+		return float64(i)
+	case float32:
+		return float64(i)
+	case float64:
+		return i
+	case string:
+		f, _ := strconv.ParseFloat(strings.TrimSpace(i), 64)
+		return f
+	}
+	return 0.0
+}
+
+// ToString converts a value to a string.
+func ToString[T string | int | int64 | float32 | float64](value T) string {
+	var x interface{} = value
+	switch i := x.(type) {
+	case int:
+		return strconv.Itoa(i)
+	case int64:
+		return strconv.FormatInt(i, 10)
+	case float32:
+		return strconv.FormatFloat(float64(i), 'f', -1, 32)
+	case float64:
+		return strconv.FormatFloat(i, 'f', -1, 64)
+	case string:
+		return i
+	}
+	return ""
+}
diff --git a/convert_test.go b/convert_test.go
new file mode 100644
index 0000000..0c6ee29
--- /dev/null
+++ b/convert_test.go
@@ -0,0 +1,134 @@
+package q5
+
+import (
+	"testing"
+)
+
+func TestToInt(t *testing.T) {
+	// int
+	var input int = 50
+	var expected int = 50
+	result := ToInt(input)
+	if expected != result {
+		t.Errorf("For input %v, expected %d, but got %d", input, expected, result)
+	}
+
+	// int64
+	var input2 int64 = 50000
+	var expected2 int = 50000
+	result2 := ToInt(input2)
+	if expected2 != result2 {
+		t.Errorf("For input %v, expected %d, but got %d", input2, expected2, result2)
+	}
+
+	// float
+	var input3 float64 = 3.14
+	var expected3 int = 3
+	result3 := ToInt(input3)
+	if expected3 != result3 {
+		t.Errorf("For input %v, expected %d, but got %d", input3, expected3, result3)
+	}
+
+}
+
+func TestToInt64(t *testing.T) {
+	// int
+	var input int = 50
+	var expected int64 = 50
+	result := ToInt64(input)
+	if expected != result {
+		t.Errorf("For input %v, expected %v, but got %v", input, expected, result)
+	}
+
+	// int64
+	var input2 int64 = 50000
+	var expected2 int64 = 50000
+	result2 := ToInt64(input2)
+	if expected2 != result2 {
+		t.Errorf("For input %v, expected %v, but got %v", input2, expected2, result2)
+	}
+
+	// float
+	var input3 float64 = 3.14
+	var expected3 int64 = 3
+	result3 := ToInt64(input3)
+	if expected3 != result3 {
+		t.Errorf("For input %v, expected %v, but got %v", input3, expected3, result3)
+	}
+
+	// string
+	var input4 string = "100108454613"
+	var expected4 int64 = 100108454613
+	result4 := ToInt64(input4)
+	if expected4 != result4 {
+		t.Errorf("For input %v, expected %v, but got %v", input4, expected4, result4)
+	}
+}
+
+func TestToFloat(t *testing.T) {
+	// int
+	var input int = 50
+	var expected float64 = 50
+	result := ToFloat(input)
+	if expected != result {
+		t.Errorf("For input %v, expected %v, but got %v", input, expected, result)
+	}
+
+	// int64
+	var input2 int64 = 50000
+	var expected2 float64 = 50000
+	result2 := ToFloat(input2)
+	if expected2 != result2 {
+		t.Errorf("For input %v, expected %v, but got %v", input2, expected2, result2)
+	}
+
+	// float
+	var input3 float64 = 3.14
+	var expected3 float64 = 3.14
+	result3 := ToFloat(input3)
+	if expected3 != result3 {
+		t.Errorf("For input %v, expected %v, but got %v", input3, expected3, result3)
+	}
+
+	// string
+	var input4 string = "100108454613"
+	var expected4 float64 = 100108454613
+	result4 := ToFloat(input4)
+	if expected4 != result4 {
+		t.Errorf("For input %v, expected %v, but got %v", input4, expected4, result4)
+	}
+}
+
+func TestToString(t *testing.T) {
+	// int
+	var input int = 50
+	var expected string = "50"
+	result := ToString(input)
+	if expected != result {
+		t.Errorf("For input %v, expected %s, but got %s", input, expected, result)
+	}
+
+	// int64
+	var input2 int64 = 50000
+	expected2 := "50000"
+	result2 := ToString(input2)
+	if expected2 != result2 {
+		t.Errorf("For input %v, expected %v, but got %v", input2, expected2, result2)
+	}
+
+	// float
+	var input3 float64 = 3.14
+	var expected3 string = "3.14"
+	result3 := ToString(input3)
+	if expected3 != result3 {
+		t.Errorf("For input %v, expected %v, but got %v", input3, expected3, result3)
+	}
+
+	// string
+	input4 := "apple"
+	expected4 := "apple"
+	result4 := ToString(input4)
+	if expected4 != result4 {
+		t.Errorf("For input %v, expected %v, but got %v", input4, expected4, result4)
+	}
+}
diff --git a/local_ip.go b/local_ip.go
new file mode 100644
index 0000000..aa84660
--- /dev/null
+++ b/local_ip.go
@@ -0,0 +1,33 @@
+package q5
+
+import (
+	"fmt"
+	"net"
+)
+
+func GetLocalIP() (string, error) {
+	interfaces, err := net.Interfaces()
+	if err != nil {
+		return "", err
+	}
+	for _, iface := range interfaces {
+		if iface.Flags&net.FlagUp == 0 || iface.Flags&net.FlagLoopback != 0 {
+			continue
+		}
+		addrs, err := iface.Addrs()
+		if err != nil {
+			return "", err
+		}
+		for _, addr := range addrs {
+			ipnet, ok := addr.(*net.IPNet)
+			if !ok || ipnet.IP.IsLoopback() {
+				continue
+			}
+			if ipnet.IP.To4() != nil {
+				return ipnet.IP.String(), nil
+			}
+		}
+	}
+
+	return "", fmt.Errorf("无法获取本机有效的IP地址")
+}
diff --git a/local_ip_test.go b/local_ip_test.go
new file mode 100644
index 0000000..c4e5ca3
--- /dev/null
+++ b/local_ip_test.go
@@ -0,0 +1,15 @@
+package q5
+
+import (
+	"fmt"
+	"testing"
+)
+
+func TestGetLocalIP(t *testing.T) {
+	ip, err := GetLocalIP()
+	if err != nil {
+		// 错误处理
+		t.Errorf("local ip %v error:%s", ip, err)
+	}
+	fmt.Printf("local ip:[%s]\n", ip)
+}