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Introduction to GoLang

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Modifying Variable Values

We've learned how to declare a variable. Now, let's understand how to modify the value of a variable.

Take a look at the following program, which prints the value of myVariable using the Println function:

go

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package main
import "fmt"

func main() {
var myVariable = 7
fmt.Println(myVariable) // Using the name of the variable ('myVariable') we can access and show it's value
}

              
1234567

            
package main
import "fmt"

func main() {
    var myVariable = 7
    fmt.Println(myVariable) // Using the name of the variable ('myVariable') we can access and show it's value
}

We can use the following syntax for assigning a different value to the variable:

go

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myVariable = 9

              
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myVariable = 9

Notice that this time, we omit the var keyword because we are not declaring a new variable. Now, let's add this line to the program:

go

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package main
import "fmt"

func main() {
var myVariable = 7
fmt.Println(myVariable) // Outputs 7
myVariable = 9
fmt.Println(myVariable) // Outputs 9
}

              
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package main
import "fmt"

func main() {
    var myVariable = 7
    fmt.Println(myVariable) // Outputs 7
    myVariable = 9
    fmt.Println(myVariable) // Outputs 9
}

In the code above, we employed the var keyword to declare a variable. Alternatively, we can use the := operator for variable declaration. In such a case, the code will appear as follows:

go

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package main
import "fmt"

func main() {
myVariable := 7
fmt.Println(myVariable) // Outputs 7
myVariable = 9
fmt.Println(myVariable) // Outputs 9
}

              
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package main
import "fmt"

func main() {
    myVariable := 7
    fmt.Println(myVariable) // Outputs 7
    myVariable = 9
    fmt.Println(myVariable) // Outputs 9
}
question mark

Which is the correct way of changing the value of an already declared variable to 10 called myVar:

Select the correct answer

Everything was clear?

How can we improve it?

Thanks for your feedback!

Section 1. Chapter 5
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