How to convert a string to a number in Go?

In Go, functions from the strconv package are used to convert strings to numbers. Depending on the type of number, you can use:

• strconv.Atoi — to convert a string to int.
• strconv.ParseInt — to convert to an integer with specified base and size.
• strconv.ParseFloat — for floating-point numbers.

Example of converting a string to int:

package main

import (
    "fmt"
    "strconv"
)

func main() {
    s := "12345"
    num, err := strconv.Atoi(s)
    if err != nil {
        fmt.Println("Conversion error:", err)
        return
    }
    fmt.Println("Number:", num)
}

For more flexible control (for example, if you need to specify the base or size), you can use ParseInt:

num64, err := strconv.ParseInt(s, 10, 64) // base 10, 64-bit integer