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Conditions if/else.

Objective

To understand if/else conditions.

If/else conditions are of very fundamental importance to programming and are present in all the programming languages.

The intent of condition is very simple

if condition {
    do something
} else {
    do another thing
}

Structure

Navigate to our code folder

code/basic/

For our program create a new folder '07_if_else'

code/basic/07_if_else

And lets create a file 'if_else.go' in it, finally the structure would look like this:

code/basic/07_if_else/if_else.go

Code

The code will be divided into two parts

1.)

if/else condition

go 1 package main 2 3 import "fmt" 4 5 func main() { 6 d := "Dog" 7 c := "Cat" 8 9 // checking the value of variables 10 if d == "Dog" { 11 fmt.Println("Woff") 12 } else { 13 fmt.Println("I don't know which animal!") 14 } 15

Review

on line 10 we check if the value of the variable "d" is equal to "Dog"

if d == "Dog"

If the condition is true then we print out "Woff"

fmt.Println("Woff")

If the condition is false, we print "I don't know which animal"

fmt.Println("I don't know which animal!")

2.) If/else statements can also be chained if you have multiple conditions

if/else condition
16 // You can also chain if / else conditions
17 if c == "monkey" {
18  fmt.Println("I am a monkey.")
19 } else if c == "Dog" {
20  fmt.Println("I am a dog.")
21 } else if c == "Cat" {
22  fmt.Println("Meoww")
23 }
24 }

Review

On line 17 we check if value of the variable "c" is "monkey", if the conditions evaluates to true then we print "I am a monkey"

if c == "monkey"

If it evaluates to false then we check it once again if it contains the value of "Dog"

if c == "Dog"

Since, this also evaluates to false, we check for the next condition

if c == "Cat"

As it evaluates to true, we print out "Meoww" on the screen

fmt.Println("Meoww")

In case if "c" does not evaluate to true in any of the case, nothing will be printed.

Running your code

Open your terminal and navigate to our folder

ccode/basic/07_if_else

Once in the folder type the following command

go run if_else.go

Output

Output
Woff
Meoww

Note

Strings in Go are case sensitive, "monkey" and "Monkey" are evaluated differently, so be sure of using the right case when checking for evaluation.

Github

Just in case you have some errors with your code, you can check out the code at github repo

Github Repo

Golang Playground

You can also run the code at playground

Golang Playground

Next

We will see for loops.

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