Basic Components II

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