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Golang Goroutine, Map, and Reflection | Find Output Programs | Set 4

This section contains the Golang Goroutine, Map, and Reflection find output programs (set 4) with their output and explanations.
Submitted by Nidhi, on November 09, 2021

Program 1:

package main

import "fmt"

func main() {
	CountryCode := make(map[string]int)

	CountryCode["ind"] = 101
	CountryCode["aus"] = 102
	CountryCode["eng"] = 103
	CountryCode["pak"] = 104
	CountryCode["usa"] = 105

	fmt.Println("Length of CountryCode: ", len(CountryCode))
}

Output:

Length of CountryCode:  5

Explanation:

In the above program, we created a map CountryCode to store codes of different countries. Then we printed the count of map elements.

---

Program 2:

package main

import "fmt"

func main() {
	CountryCode := make(map[string]int)

	CountryCode["ind"] = 101
	CountryCode["aus"] = 102
	CountryCode["eng"] = 103
	CountryCode["pak"] = 104
	CountryCode["usa"] = 105

	fmt.Printf("\nMap elements: ")
	for value := range CountryCode.values() {
		fmt.Printf("\n%d", value)
	}
}

Output:

./prog.go:15:32: CountryCode.values undefined (type map[string]int has no field or method values)

Explanation:

The above program will generate a syntax error because the values() method is not available in this context.

---

Program 3:

package main

import "fmt"

func main() {
	CountryCode := make(map[string]int)

	CountryCode["ind"] = 101
	CountryCode["aus"] = 102
	CountryCode["eng"] = 103
	CountryCode["pak"] = 104
	CountryCode["usa"] = 105

	fmt.Printf("\nMap elements: ")
	for Key, Value := range CountryCode {
		fmt.Printf("\n%s : %d", Key, Value)
	}
}

Output:

Map elements: 
ind : 101
aus : 102
eng : 103
pak : 104
usa : 105

Explanation:

In the above program, we created a map CountryCode to store codes of different countries. Then we printed the keys and values of the created map using "range".

---

Program 4:

package main

import "fmt"
import "reflect"

func main() {
	var num1 int = 10
	var num2 byte = 20
	var str string = "Hello"

	fmt.Println("Type of num1 is: ", reflect.TypeOf(num1))
	fmt.Println("Type of num2 is: ", reflect.TypeOf(num2))
	fmt.Println("Type of str is : ", reflect.TypeOf(str))
}

Output:

Type of num1 is:  int
Type of num2 is:  uint8
Type of str is :  string

Explanation:

In the above program, we created three different types of variables with some initial values. Then we printed the type of created variables using reflect.TypeOf() function and print the result.

---

Program 5:

package main

import "fmt"
import "reflect"

func main() {
	fmt.Println("Type is: ", reflect.TypeOf(10))
	fmt.Println("Type is: ", reflect.TypeOf("Hello"))
}

Output:

Type is:  int
Type is:  string

Explanation:

In the above program, we printed the type of specified values using reflect.TypeOf() function and print the result.

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