In my previous article, We had seen how variables such as integers in action.

**Float**

In Golang float have two classes like integers.

float32

float64

Float32, used when accuracy and precision doesn't matter

Float64 used in scientistic simulation where precision of data really matter.

package main

import (

"fmt"

"math"

)

func main() {

var radius float64 = 3.0

fmt.Println(2 * math.Pi *(math.Pow(radius,2))) }

**Math:**

**Just like C you can import package before use**

**,**that why i import math package.

**math.pi:**

**Go provide build-in package math which handle all mathematical operation such as pi, sin-function , cose-function etc.**

**math.Pow:**

In Go power function already in math package. Pow take two parameters one number and second degree. Pow return in float64. Because of Pow type we initialize our variable with similar data-type.

If data type are not same then you need to type conversion otherwise it give you error mismatch data type

**Byte**

Byte used to store single character. Char replace from byte in golang.Byte doesn't have any class.

**Complex**

Suppose you're a mathematician and you're solving complex problem. Before solve problem you make sure your toolkit have all tools which you need. Otherwise you can't solve problem. Normally complex data type not used very much because most of our problems based on real numbers.

Complex again have two classes Complex64, Complex 128

package main

import (

"fmt"

)

func main() {

var c complex128 = complex(1,2)

var d complex128 = complex(3,4)

fmt.Println("real:",real(c+d), "imag:",imag(c+d))

}

**Pointers**

Pointers is also called variable because it contain address of particular variable. Pointers are powerful.

package main

import (

"fmt"

)

func main() {

x := 100 // x is short name declaration

p := &x // p also belong to this category

fmt.Printf("Value:%d", *p )

*p++

fmt.Printf("Inc :%d", *p )

}

*Challenge for you*You can write a algorithm which point towards x without using short name declaration syntax

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