# Golang Example - Convert(cast) Binary to Decimal or Decimal to Binary Number

In these posts, You will learn two programs in Go language
The first program is to convert Binary Number to Decimal Number
Second program to convert Decimal Number to Binary Number.

A binary number is a number based on base 2. It contains either zero or one digits. Each digit is called a bit, Example binary numbers are 1011

Decimal Number are numbers which contain numbers based on base 10

To understand this example, You should have following features in Go language.

### Example Program to convert Binary to Decimal Number

There are 2 ways to convert binary number to decimal number

• Using strconv ParseInt function
• Write conversion logic manually without using inbuilt functions

The below programs takes input binary number from a user console, store it in variable binary.

#### strconv ParseInt function example to Cast Binary To decimal

strconv package provides ParseInt function used to convert binary to decimal numbers Here is an example program

``````package main

import (
"fmt"
"strconv"
)

func main() {
var binary string
fmt.Print("Enter Binary Number:")
fmt.Scanln(&binary)
output, err := strconv.ParseInt(binary, 2, 64)
if err != nil {
fmt.Println(err)
return
}

fmt.Printf("Output %d", output)

}

``````

Output is

``````Enter Binary Number:1111
Output 15

``````

#### Manual Custom function to Cast Binary To decimal using for loop

Created an own function, inside a function, used for loop  with Modulus, Division operator and Math pow function
Here is an example program

``````package main

import (
"fmt"
"math"
)

func convertBinaryToDecimal(number int) int {
decimal := 0
counter := 0.0
remainder := 0

for number != 0 {
remainder = number % 10
decimal += remainder * int(math.Pow(2.0, counter))
number = number / 10
counter++
}
return decimal
}

func main() {
var binary int
fmt.Print("Enter Binary Number:")
fmt.Scanln(&binary)

fmt.Printf("Output %d", convertBinaryToDecimal(binary))

}

``````

Output is

``````Enter Binary Number:1001
Output 9

``````

### Example Program to convert Decimal to Binary Number

We have 2 ways to convert Decimal to Binary number in Golang. Following are two ways

• using strconv FormatInt function
• Manually conversion without using Inbuilt function

Below program takes decimal input number from user console, stores it in variable decimal

#### strconv FormatInt function example to cast Decimal to Binary

Inbuilt Standard package strconv provides FormatInt function used to convert Decimal to Binary number.
Here is an example program

``````package main

import (
"fmt"
"strconv"
)
func main() {
var decimal int64
fmt.Print("Enter Decimal Number:")
fmt.Scanln(&decimal)
output := strconv.FormatInt(decimal, 2)
fmt.Print("Output ", output)

}

``````

Output is

``````Enter Decimal Number:15
Output 1111

``````

#### Cast Decimal to binary for loop without inbuilt function

The following program uses Golang features For loop, Modulus and division operators.
Here is an example program to do the conversion.

``````package main

import (
"fmt"
)

func convertDecimalToBinary(number int) int {
binary := 0
counter := 1
remainder := 0

for number != 0 {
remainder = number % 2
number = number / 2
binary += remainder * counter
counter *= 10

}
return binary
}

func main() {
var decimal int
fmt.Print("Enter Decimal Number:")
fmt.Scanln(&decimal)

fmt.Printf("Output %d", convertDecimalToBinary(decimal))

}

``````

Output is

``````Enter Decimal Number:15
Output 1111

``````
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