Go string转int,int64,int32及注意事项说明

	// string 转 int
	str5 := "123"
	int5, err := strconv.Atoi(str5)
	if err != nil {
		fmt.Println(err)
	} else {
		fmt.Printf("int5 value is %d, type is %T\n", int5, int5)
		// int5 value is 123, type is int
	}

	// string 转 int
	str6 := "-123"
	int6, err := strconv.Atoi(str6)
	if err != nil {
		fmt.Println(err)
	} else {
		fmt.Printf("int6 value is %d, type is %T\n", int6, int6)
		// int6 value is -123, type is int
	}

	// string 转 int64
	str7 := "123"
	int7, err := strconv.ParseInt(str7, 10, 64)
	if err != nil {
		fmt.Println(err)
	} else {
		fmt.Printf("int7 value is %d, type is %T\n", int7, int7)
		// int7 value is 123, type is int
	}

	// string 转 int64
	str9 := "123"
	// 参数1 数字的字符串形式
	// 参数2 数字字符串的进制 比如二进制 八进制 十进制 十六进制
	// 参数3 返回结果的bit大小 也就是int8 int16 int32 int64
	int9, err := strconv.ParseInt(str9, 8, 64)
	if err != nil {
		fmt.Println(err)
	} else {
		fmt.Printf("int9 value is %d, type is %T\n", int9, int9)
		// int9 value is 83, type is int64
		// 83 = 1 * 8^2 + 2 * 8^1 + 3 * 8^0
	}

	// string 转 int32
	str10 := "123"
	int10, err := strconv.ParseInt(str10, 10, 32)
	if err != nil {
		fmt.Println(err)
	} else {
		j := int32(int10)
		fmt.Printf("j value is %d, type is %T", j, j)
		// j value is 123, type is int32%
	}
}

	// string 转 数值类型 必须为数字的字符串形式
	str1 := "123sd"
	int1, err := strconv.Atoi(str1)
	if err != nil {
		fmt.Println(err) // strconv.Atoi: parsing "123sd": invalid syntax
	} else {
		fmt.Printf("int1 value is %d, type is %T\n", int1, int1)
	}

	// string 转 数值类型 必须为数字的字符串形式
	str2 := "123sd123"
	int2, err := strconv.Atoi(str2)
	if err != nil {
		fmt.Println(err) // strconv.Atoi: parsing "123sd123": invalid syntax
	} else {
		fmt.Printf("int2 value is %d, type is %T\n", int2, int2)
	}

	// string 转 数值类型 数值范围必须在目标范围内
	str3 := "11111111111111111111"
	int3, err := strconv.Atoi(str3)
	if err != nil {
		fmt.Println(err) // strconv.Atoi: parsing "11111111111111111111": value out of range
	} else {
		fmt.Printf("int3 value is %d, type is %T\n", int3, int3)
	}

	// string 转 数值类型 浮点数无法转整型
	str4 := "123.12"
	int4, err := strconv.Atoi(str4)
	if err != nil {
		fmt.Println(err) // strconv.Atoi: parsing "123.12": invalid syntax
	} else {
		fmt.Printf("int4 value is %d, type is %T\n", int4, int4)
	}