Number parsing

Context

Convert strings to numbers using the strconv package. The most common functions:

• strconv.Atoi(s) – string to int (base 10)
• strconv.ParseInt(s, base, bitSize)
• strconv.ParseFloat(s, bitSize)
• strconv.ParseUint(s, base, bitSize)

Example

Parse an integer and a floating point number from strings.

Code example

package main

import (
    "fmt"
    "strconv"
)

func main() {
    s1 := "123"
    i, err := strconv.Atoi(s1)
    if err == nil {
        fmt.Println("Parsed int:", i)
    }

    s2 := "3.14159"
    f, err := strconv.ParseFloat(s2, 64)
    if err == nil {
        fmt.Println("Parsed float:", f)
    }

    // Hexadecimal
    hex := "FF"
    val, _ := strconv.ParseInt(hex, 16, 64)
    fmt.Printf("Hex %s = %d\n", hex, val)
}

Output

Parsed int: 123
Parsed float: 3.14159
Hex FF = 255

Useful links

• strconv package documentation
• Go by Example: Number Parsing