Algorithms | Recursion | Question 5

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What does fun2() do in general? 

C++ 
#include <iostream>  int fun(int x, int y) {     if (y == 0) return 0;     return (x + fun(x, y-1)); }  int fun2(int a, int b) {     if (b == 0) return 1;     return fun(a, fun2(a, b-1)); }
C 
int fun(int x, int y) {     if (y == 0)   return 0;     return (x + fun(x, y-1)); }  int fun2(int a, int b) {     if (b == 0) return 1;     return fun(a, fun2(a, b-1)); }
Java 
public class Main {     public static int fun(int x, int y) {         if (y == 0) return 0;         return (x + fun(x, y - 1));     }      public static int fun2(int a, int b) {         if (b == 0) return 1;         return fun(a, fun2(a, b - 1));     }      public static void main(String[] args) {         // Example usage     } }
Python 
def fun(x, y):     if y == 0:         return 0     return x + fun(x, y - 1)  def fun2(a, b):     if b == 0:         return 1     return fun(a, fun2(a, b - 1))
JavaScript 
function fun(x, y) {     if (y === 0) return 0;     return x + fun(x, y - 1); }  function fun2(a, b) {     if (b === 0) return 1;     return fun(a, fun2(a, b - 1)); }

x*y

x+x*y

xy

yx

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