Question

I need help with this program.

C++

Given a string, compute recursively (no loops) a new string where all appearances of "pi" have been replaced by "3.14".

It should enter a string like:

(xpix)--> and print out " x3.14x"

(pi)--> and print out " 3.14p"

(pipi)--> and print out " 3.143.14"

This is what I have so far...

#include<iostream>

#include<string>

using namespace std;

string changePi(string str) {

string left;

if(str.length() < 2) return str;

if(str.substr(0, 1).compare("pi"))

return "3.14" + changePi(str.substr(2));

return str.at(0) + changePi(str.substr(1)); }

int main() {

string stra;

cout << "Enter a string: ";

cin >> stra;

string temp = "pi";

string result = changePi(temp);

cout << "changePi" << "(" << stra << ")" << " --> " << result;

return 0;

}