Recursion is different types:
- Direct Recursion : Program to illustrate the Fibonacci series
package main import "fmt" func fib(i int) int { if i == 0 { return 1 } if i == 1 { return 1 } return fib(i-1) + fib(i-2) } func main() { var i int for i = 0; i
Output :
PS C:\GO_Language\recursion> go run recursion.go 1 1 2 3 5 8 13 21 34 55
- Indirect Recursion: Program to illustrate indirect recursion between two functions.
package main import "fmt" func print_one(n int) { if n >= 0 { fmt.Println("In first function:", n) print_two(n - 1) } } func print_two(n int) { if n >= 0 { fmt.Println("In second function:", n) print_one(n - 1) } } func main() { print_one(10) print_one(-1) }
Output :
PS C:\GO_Language\recursion> go run indirect_re.go In first function: 10 In second function: 9 In first function: 8 In second function: 7 In first function: 6 In second function: 5 In first function: 4 In second function: 3 In first function: 2 In second function: 1 In first function: 0
- Tail recursion : Golang program to illustrate the concept of tail recursion
package main import ( "fmt" ) // tail-recursive function to print all numbers from n to 1 func print_num(n int) { // if a number is still positive, print it and call the function with the decremented value if n > 0 { fmt.Println(n) // last statement in the recursive function tail recursive call print_num(n - 1) } } // main function func main() { // passing a positive number, prints 5 to 1 print_num(5) }
Output :
PS C:\GO_Language\recursion> go run rec3.go 5 4 3 2 1
- Head Recursion : Golang program to illustrate the concept of head recursion
package main import ( "fmt" ) func print_num(n int) { if n > 0 { print_num(n - 1) fmt.Println(n) } } func main() { print_num(5) }
Output :
PS C:\GO_Language\recursion> go run rec4.go 1 2 3 4 5
- Infinite Recursion :Infinite repetition occurs when the second condition is not followed. , There’s an infinite recursion in action here
package main import ( "fmt" ) func print_hello() { fmt.Println("Prwatech") print_hello() } func main() { print_hello() }
Output :
PS C:\GO_Language\recursion> go run rec5.go Prwatech Prwatech Prwatech Prwatech Prwatech Prwatech Prwatech Prwatech Prwatech Prwatech Prwatech Prwatech Prwatech Prwatech Prwatech Prwatech Prwatech Prwatech Prwatech Prwatech Prwatech Prwatech Prwatech Prwatech Prwatech Prwatech Prwatech Prwatech Prwatech Prwatech Prwatech Prwatech Prwatech Prwatech Prwatech Prwatech Prwatech Prwatech exit status 0xc000013a
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