Converting String to Integer in Go

Converting String to Integer in Go, this integer type using the built-in strconv package. The strconv package provides functions for converting strings to various types, including integers.

Using strconv.Atoi (Converting String to Integer in Go)

The strconv.Atoi function is used to convert a string to an integer type (int). Here's an example:

package main

import (
    "fmt"
    "strconv"
)

func main() {
    // String to be converted
    str := "42"

    // Convert string to int
    num, err := strconv.Atoi(str)
    if err != nil {
        // Handle error
        fmt.Println("Error:", err)
        return
    }

    // Print the converted integer
    fmt.Println("Integer value:", num)
}

Output:

Integer value: 42

In the above example, we use strconv.Atoi to convert the string "42" to an integer value. The function returns two values: the converted integer and an error value (err). If the conversion is successful, err will be nil. Otherwise, it will contain an error description.

Note that strconv.Atoi returns an int type, which may cause overflow errors for large integer values. If you need to handle larger integers, you can use the strconv.ParseInt function instead.

Using strconv.ParseInt
The strconv.ParseInt function allows you to convert a string to an integer type (int64) while specifying the base (binary, decimal, hexadecimal, etc.). Here's an example:

package main

import (
    "fmt"
    "strconv"
)

func main() {
    // String to be converted
    str := "2A"

    // Convert string to int64 (base 16)
    num, err := strconv.ParseInt(str, 16, 64)
    if err != nil {
        // Handle error
        fmt.Println("Error:", err)
        return
    }

    // Print the converted integer
    fmt.Println("Integer value:", num)
}

Output:

Integer value: 42

In this example, we use strconv.ParseInt to convert the hexadecimal string "2A" (base 16) to an int64 value. The third argument 64 specifies the bitSize, which determines the output type (int64 in this case).

You can also use strconv.ParseInt to convert strings representing decimal numbers by passing 10 as the base value.

Error Handling

When converting strings to integers, it's essential to handle possible errors. Common errors include:

• Invalid string format (e.g., non-numeric characters)
• Integer overflow/underflow (e.g., value too large or too small for the target integer type)

Always check the error value returned by strconv.Atoi or strconv.ParseInt and handle the error appropriately in your code.

By using the strconv package in Go, you can easily be converting string to integer in Go types, enabling you to work with numeric data in your Go programs.

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