Go - Type Casting

Type conversion is a way to convert a variable from one data type to another data type. For example, if you want to store a long value into a simple integer then you can type cast long to int. You can convert values from one type to another using the cast operator. Its syntax is as follows −

type_name(expression)

Example - Division without Type Casting

Consider the following example where the division of one integer variable by another results in loss of precision.

main.go

package main

import "fmt"

func main() {
   var sum int = 17
   var count int = 5
   var mean int
   
   mean = sum/count
   fmt.Printf("Value of mean : %d\n",mean)
}

Output

When the above code is compiled and executed, it produces the following result −

Value of mean : 3

Example - Division with Type Casting

Consider the following example where the cast operator causes the division of one integer variable by another to be performed as a floating number operation.

main.go

package main

import "fmt"

func main() {
   var sum int = 17
   var count int = 5
   var mean float32
   
   mean = float32(sum)/float32(count)
   fmt.Printf("Value of mean : %f\n",mean)
}

Output

When the above code is compiled and executed, it produces the following result −

Value of mean : 3.400000