diff --git a/main.go b/main.go
index c8a6bae..bc4e9b3 100644
--- a/main.go
+++ b/main.go
@@ -2,55 +2,71 @@ package main
 
 import (
 	"fmt"
-
-	"github.com/gin-gonic/gin"
 )
 
 func main() {
-	var i int
+	// var i int
+	// // sum := 0
+	// var balance = [5]float32{1000.0, 2.0, 3.4, 7.0, 50.0}
+	// for i = 0; i < 5; i++ {
+	// 	fmt.Printf("balance[%d] = %f\n", i, balance[i])
+	// }
+
+	// a := []float32{1.2, 2.3, 34, 4.7}
+	// nums := []int{2, 3, 4}
 	// sum := 0
-	var balance = [5]float32{1000.0, 2.0, 3.4, 7.0, 50.0}
-	for i = 0; i < 5; i++ {
-		fmt.Printf("balance[%d] = %f\n", i, balance[i])
-	}
-
-	a := []float32{1.2, 2.3, 34, 4.7}
-	nums := []int{2, 3, 4}
-	sum := 0
-	for _, num := range nums {
-		sum += num
-	}
-	fmt.Println("sum:", sum)
+	// for num := range nums {
+	// 	sum += num
+	// }
 	// fmt.Println("sum:", sum)
+	// // fmt.Println("sum:", sum)
 
-	type stu struct {
-		name   string
-		id     int
-		gender string
+	// type stu struct {
+	// 	name   string
+	// 	id     int
+	// 	gender string
+	// }
+	// var newstu = stu{"zhangsan", 2, "男"}
+	// fmt.Println(newstu)
+	// fmt.Println(newstu.gender)
+
+	// var identifier []int
+	// var slice1 []int = make([]int, 2)
+	// println(identifier)
+	// println(slice1)
+
+	// var countryMap map[string]string
+	// countryMap = make(map[string]string)
+	// countryMap["china"] = "北京"
+	// for capital := range countryMap {
+	// 	fmt.Println(capital, countryMap[capital])
+	// }
+
+	// r := gin.Default()
+	// r.GET("xie", func(c *gin.Context) {
+	// 	c.JSON(200, gin.H{
+	// 		"data":    "zbck",
+	// 		"balance": balance,
+	// 		"a":       a,
+	// 	})
+	// })
+	// r.Run()
+	const sum = 100
+	var i, j int
+	for i = 2; i < sum; i++ {
+		var c = 0
+		for j = 2; j <= i-1; j++ {
+			if i%j == 0 {
+				c = 1
+				break
+			}
+		}
+		if c == 0 {
+			fmt.Println(i, "素数")
+		}
 	}
-	var newstu = stu{"zhangsan", 2, "男"}
-	fmt.Println(newstu)
-	fmt.Println(newstu.gender)
-
-	var identifier []int
-	var slice1 []int = make([]int, 2)
-	println(identifier)
-	println(slice1)
-
-	var countryMap map[string]string
-	countryMap = make(map[string]string)
-	countryMap["china"] = "北京"
-	for capital := range countryMap {
-		fmt.Println(capital, countryMap[capital])
-	}
-
-	r := gin.Default()
-	r.GET("xie", func(c *gin.Context) {
-		c.JSON(200, gin.H{
-			"data":    "zbck",
-			"balance": balance,
-			"a":       a,
-		})
-	})
-	r.Run()
+	fmt.Println(goodidea("2"))
+}
+func goodidea(name string) string {
+	return "5"
 }