Go

go run hello.go


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Example :#1 [Hello world Example ]

package main
import "fmt"

func main(){

fmt.Println("Hello World!")

}

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Example :#2  [ How to create a variable? ]
package main

import "fmt"

func main(){
var name ="Hello GoLang!"
fmt.Println(name)
}
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Example :#3 [ Special Character ]
- we can't use any special character like @ or similar
- only use underscore or _

package main
import "fmt"

func main(){
var @name ="Hello GoLang....."
fmt.Println(@name)
}

Error
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Example :#4 [  ./prog.go:6:5: assignment mismatch: 1 variables but 2 values ]

package main

import "fmt"

func main(){
var name = "Hello", "World"
//./prog.go:6:5: assignment mismatch: 1 variables but 2 values

fmt.Println(name)
}


..........
Solutions , How to do that
package main
import "fmt"

func main(){
var name, welcome = "Hello", "World"
fmt.Println(name, welcome)
}

variable

package main
import "fmt"

func main(){
var name, welcome = "Hello", "World"
var place
place ="New Delhi"
fmt.Println(name, welcome, place)
}
Error ./prog.go:7:10: syntax error: unexpected newline, expecting type

package main

import "fmt"

func main(){

var name, welcome = "Hello", "World"

var place string

place ="New Delhi"

fmt.Println(name, welcome, place)

}

.................................

package main

import "fmt"

func main(){

var name, welcome = "Hello", "World"

var place string

place =123  // does not work

fmt.Println(name, welcome, place)

}

[Short Variable ]

package main

import "fmt"

func main(){

welcome:="Hello World.."

fmt.Printf("%T", welcome)

}

//String

package main

import "fmt"

func main(){

welcome:=23455

fmt.Printf("%T",welcome)

}

//int

package main

import "fmt"

func main(){

welcome:=2*2

fmt.Print(welcome)

}

//4

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Example :#5 [ Rest API ]

package main
import (
"fmt"
"net/http"
"log"
)

func homePage(w http.ResponseWriter, r *http.Request){
fmt.Fprintf(w, "Hello golang developer!!!!")
}
func RequestPage(){
http.HandleFunc("/",homePage )
log.Fatal(http.ListenAndServe(":8081", nil))
}

func main(){
RequestPage()


}


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Example :#6 [ ]


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Example :#7 [  ]



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Example :#8 [ ]



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Example :#9 [ ]



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Example :#10 [  ]


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Example :#11 [  ]


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Example :#12 [  ]


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Example :#13 [  ]


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Example :#14 [  ]


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Example :#15 [  ]