New Go

BasicSyntax/prime/realnum.go

@@ -0,0 +1,33 @@
+package main
+
+import "fmt"
+
+// 定义字符串反转函数
+func reverse(s string) string {
+	runes := []rune(s)
+	for i, j := 0, len(runes)-1; i < j; i, j = i+1, j-1 {
+		runes[i], runes[j] = runes[j], runes[i]
+	}
+	return string(runes)
+}
+
+func main() {
+	var n string
+	fmt.Scan(&n)
+
+	// 检查是否以 + 或 - 开头
+	if n[0] == '-' || n[0] == '+' {
+		fmt.Println("NULL")
+		return
+	}
+
+	// 反转字符串
+	n = reverse(n)
+
+	// 去掉前导零
+	for len(n) > 1 && n[0] == '0' {
+		n = n[1:]
+	}
+
+	fmt.Println(n)
+}