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Golang const, Type Casting | Find Output Programs | Set 1

This section contains the Golang const, Type Casting find output programs (set 1) with their output and explanations.
Submitted by Nidhi, on August 13, 2021

Program 1:

package main

import "fmt"

func main() {
	const num1 = 100
	const num2 = 200
	var sum = 0

	sum = num1 + num2

	fmt.Println("Sum: ", sum)
}

Output:

Sum:  300

Explanation:

In the above program, we created two constants num1 and num2 which was initialized with 100, 200 respectively. Then we added the values of num1 and num2 and assigned the result to the sum variable. After that, we printed the result on the console screen.

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Program 2:

package main

import "fmt"

var num int=100;

const func Fun(){
    num = 200;
}

func main() {
     fmt.Println("Num: ",num);
     Fun();
     fmt.Println("Num: ",num);
}

Output:

./prog.go:7:7: syntax error: unexpected func, expecting name
./prog.go:7:12: const declaration cannot have type without expression
./prog.go:7:12: missing value in const declaration

Explanation:

The above program will generate syntax errors because we cannot create a const function in the Go language.

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Program 3:

package main

import "fmt"

func main() {
	const arr = [5]int{1, 2, 3, 4, 5}

	for i := 0; i < 5; i++ {
		fmt.Println(arr[i])
	}
}

Output:

./prog.go:6:8: const initializer [5]int{...} is not a constant

Explanation:

The above program will generate a syntax error because we cannot create an array using the const keyword in the Go language.

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Program 4:

package main

import "fmt"

type Student struct {  
   const id  int=101;
   age   int  ;
   name string;
} 

func main() {
    stu := Student{name: "Amit", age: 28 }    
    fmt.Println(stu); 
}

Output:

./prog.go:6:4: syntax error: unexpected const, expecting field name or embedded type

Explanation:

The above program will generate a syntax error because we cannot create the constant field of a structure.

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Program 5:

package main

import "fmt"

func main() {
	var num int = 100
	const ptr *int = &num

	fmt.Println(*ptr)

	*ptr = 200
	fmt.Println(num)
}

Output:

./prog.go:7:8: const initializer &num is not a constant

Explanation:

The above program will generate a syntax error because we cannot create a constant pointer like this in Go language.

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