golang int cast

In Golang, the int type is the default type of the integer type. However, in the program, you may encounter situations where int needs to be forced to be converted, such as converting int to other integer types, converting float type to int type, etc. wait. This article will explore the coercion method of int type in Golang.

1. Convert int to other integer types

In Golang, the int type defaults to 32 bits (4 bytes) or 64 bits (8 bytes). Values ​​range from $-2^{31}$ to $2^{31}-1$ and $-2^{63}$ to $2^{63}-1$ respectively, depending on the machine architecture it is running on. If you need to convert the int type to other integer types (such as int8, int16, int3, int64, uint8, uint16, uint32, uint64), you need to implement it through type conversion.

The specific method is as follows:

var a int = 100
var b int8 = int8(a)   // 将 int 类型转换为 int8 类型
var c int16 = int16(a) // 将 int 类型转换为 int16 类型
var d int32 = int32(a) // 将 int 类型转换为 int32 类型
var e int64 = int64(a) // 将 int 类型转换为 int64 类型
var f uint8 = uint8(a) // 将 int 类型转换为 uint8 类型
var g uint16 = uint16(a) // 将 int 类型转换为 uint16 类型
var h uint32 = uint32(a) // 将 int 类型转换为 uint32 类型
var i uint64 = uint64(a) // 将 int 类型转换为 uint64 类型

It should be noted that different type conversions will cause precision loss or overflow problems, and the appropriate data type needs to be selected according to the specific scenario.

2. Convert float type to int type

In Golang, the float type is used to store floating point numbers, and its default type is float64. If you need to convert the float type to the int type, you need to use the Round(), Floor() or Ceil() methods under the math package provided by Golang. These methods can round, round down or round up the float type.

The specific method is as follows:

import "math"

var a float64 = 123.56

var b int = int(math.Round(a)) // 四舍五入
var c int = int(math.Floor(a)) // 向下取整
var d int = int(math.Ceil(a))  // 向上取整

It should be noted that when converting floating point numbers to integer types, precision loss or overflow problems may occur. Therefore, the choice of data type needs to be carefully considered before conversion, as well as the anomalies that may occur during the conversion process.

3. Convert int type to string type

In Golang, to convert int type to string type you need to use the Itoa() method provided in the strconv package. This method can convert an integer type into the corresponding string type.

The specific method is as follows:

import "strconv"

var a int = 123

var b string = strconv.Itoa(a) // 将 int 类型的 a 转换为字符串类型

It should be noted that the Itoa() method can only convert the int type to the string type, and can only support standard integer format. If you need to convert integers in other formats to string types, you need to use the formatted output method provided by Golang.

The above is the forced conversion method of int type in Golang. It is necessary to select the appropriate data type according to the specific situation, and carefully handle the abnormal situations that may occur during the conversion process to ensure the correctness of the program operation.

The above is the detailed content of golang int cast. For more information, please follow other related articles on the PHP Chinese website!