Write a recursive function, power, that takes as parameters two integers x and y

Question

Write a recursive function, power, that takes as parameters two integers x and y such that x is nonzero and returns x^y, For y 0: Prompt user for x and y. If user enters non-integers, then catch the exception and prompt again. Write a recursive function sumDigits that takes an integer as a parameter and returns the sum of the digits of the integer. Prompt for the integer for the user, if user enters invalid value, then catch the exception and prompt again. Write your own exception class invalidInt with what() function.

Explanation / Answer

#include<iostream>

#include<string.h>

#include<exception>

using namespace std;

class invalidInt : public exception {

  

public:

virtual const char* what() const throw() override

{

return "not an integer!!";

}

};

int sumDigits(int n) {

if (n==0) {

return 0;

}

  

return n%10 + sumDigits(n/10);

}

int main() {

int in;

  

while (true) {

try {

cout<<" Enter int: ";

cin>>in;

if (cin.fail()) {

cin.clear();

  

cin.ignore();

throw invalidInt();

}

break;

} catch(exception &e) {

cout<<e.what()<<" ";

}

}

  

  

cout<<" Sum of digits: "<<sumDigits(in);

  

cout<<" ";

return 0;

}

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