# Golang program to print the counts of 1's in a binary number

Here, we are going to learn how to print the counts of 1's in a binary number in Golang (Go Language)?
Submitted by Nidhi, on April 30, 2021

Problem Solution:

Here, we will find the count of 1's a binary number using the bits.OnesCount() function and we will print the result on the console screen.

Program/Source Code:

The source code to print the counts of 1's in a binary number is given below. The given program is compiled and executed on the ubuntu 18.04 operating system successfully.

```// Golang program to print the counts of
// 1's in an integer number

package main

import (
"fmt"
"math/bits"
)

func main() {
var num uint = 10
var num1 uint8 = 10
var num2 uint16 = 20
var num3 uint32 = 30
var num4 uint64 = 40

fmt.Printf("Binary number: %0b\n", num)
fmt.Printf("Count of 1's : %d\n\n", bits.OnesCount(num))

fmt.Printf("Binary number: %08b\n", num1)
fmt.Printf("Count of 1's : %d\n\n", bits.OnesCount8(num1))

fmt.Printf("Binary number: %016b\n", num2)
fmt.Printf("Count of 1's : %d\n\n", bits.OnesCount16(num2))

fmt.Printf("Binary number: %032b\n", num3)
fmt.Printf("Count of 1's : %d\n\n", bits.OnesCount32(num3))

fmt.Printf("Binary number: %064b\n", num4)
fmt.Printf("Count of 1's : %d\n\n", bits.OnesCount64(num4))
}
```

Output:

```Binary number: 1010
Count of 1's : 2

Binary number: 00001010
Count of 1's : 2

Binary number: 0000000000010100
Count of 1's : 2

Binary number: 00000000000000000000000000011110
Count of 1's : 4

Binary number: 0000000000000000000000000000000000000000000000000000000000101000
Count of 1's : 2
```

Explanation:

In the above program, we declare the package main. The main package is used to tell the Go language compiler that the package must be compiled and produced the executable file. Here, we imported the required packages to predefined functions.

In the main() function, we created 5 integer variables with the different numbers of bits with an initial value of 0. Then we count the total number of 1's in the corresponding binary number using the bits.OnesCount() function and print the result on the console screen.

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