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Golang Recursion | Find Output Programs | Set 2

This section contains the Golang recursion find output programs (set 2) with their output and explanations.
Submitted by Nidhi, on August 27, 2021

Program 1:

package main  
import "fmt"  

func main() {  
    static num int= 0
    
    fmt.Println("Num: ",num)

    num++

    if(num==5){
        return
    }
    main()
}  

Output:

./prog.go:5:12: syntax error: unexpected num at end of statement

Explanation:

The above program will generate a syntax error because the static keyword is not available in the Go language.

---

Program 2:

package main

import "fmt"

var num int = 0
var ptr *int = &num

func main() {
	fmt.Println("Num: ", *ptr)
	*ptr++

	if *ptr == 5 {
		return
	}
	main()
}

Output:

Num:  0
Num:  1
Num:  2
Num:  3
Num:  4

Explanation:

Here, we created a global variable num and a pointer ptr. The pointer ptr is initialized with the address of the num variable. Then we called the main() function recursively. Every time value of *ptr increased by 1 and printed value of the num variable. When the value *ptr is equal to 5 then the program gets terminated.

---

Program 3:

package main

import "fmt"

var num int = 0
var ptr *int = &num

func main() {
	fmt.Println("Num: ", *ptr)
	*ptr++

	if num == 5 {
		return
	}
	main()
}

Output:

Num:  0
Num:  1
Num:  2
Num:  3
Num:  4

Explanation:

Here, we created a global variable num and a pointer ptr. The pointer ptr is initialized with the address of the num variable. Then we called the main() function recursively. Every time value of *ptr increased by 1 and printed value of the num variable. When the value num is equal to 5 then the program gets terminated.

---

Program 4:

package main

import "fmt"

func fun(n int, p int) int {
	if p != 0 {
		return (n * fun(n, p-1))
	} else {
		return 1
	}
}

func main() {
	var result = 0

	result = fun(2, 3)
	fmt.Println("Result: ", result)
}

Output:

Result:  8

Explanation:

Here, we created two functions fun() and main(). The fun() is a recursive function, which is used to calculate the power of a specified number and return the result to the calling function.

In the main() function, we called the fun() function with the specified number and printed the result on the screen.

---

Program 5:

package main

import "fmt"

func fun(n, p int) int {
	if p != 0 {
		return (n * fun(n, p-1))
	} else {
		return 1
	}
}

func main() {
	var result = 0

	result = fun(2, 3)
	fmt.Println("Result: ", result)
}

Output:

Result:  8

Explanation:

Here, we created two functions fun() and main(). The fun() is a recursive function, which is used to calculate the power of a specified number and return the result to the calling function.

In the main() function, we called the fun() function with the specified number and printed the result on the screen.

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