Go (golang) Tutorials - If and Switch Constructs

#golang #go #programming

If and switch constructs
---------
1. Basic If
2. Basic If with short statement (variable scope)
1. If statement can accommodate a short operative statement along with a conventional conditional statement
2. Short statement variables defined in if, will be accessible only within the scope of if..else construct
3. Basic Switch (break not needed)
- Break statement is not needed, as every case will complete the switch construct when it gets executed
- Switch statement can test a string,int,character,expressions,statements,etc, whereas in c,c++, it will support only constants that too int,float,char variables
4. Switch with short statement (variable scope)
- Similar to If condition, we can include a short statement containing declaration or assignment for any switch test
5. Switch without a condition
-Empty switches should not contain any case statement. Default is the only permissible block inside empty switch
- On seeing an empty switch the compiler will understand it as "switch true" and permists the execution to the default statment
-----------------------
Code
------

------------------
package main
import "fmt"

func main(){

if a:=20; a==5 { //Declare or assign using short statement and condition
fmt.Printf("Value of a is %d and it is equal to 5\n",a)
} else {
fmt.Printf( "Value of a is %d and it is not equal to 5\n",a)
}
// fmt.Println(a) can't access the variable 'a' assigned in 'if' short statement outside the if..else construct
}

-------------
package main
import "fmt"

func main(){
switch name:="ghi";name { //Short statement with testing the variable "name"
case "abc":
fmt.Println("First three alphabets")
case "def":
fmt.Println("Second set of three alphabets")
default:
fmt.Println("Not belongs to first and second set of three alphabets")
}

switch { //Empty switch statement without any test variable - implicitly go will consider this empty switch as "switch true"
default :
fmt.Println("Empty switch default block")
}
}