Find the first maximum length even word from a string in C++

In this problem, we are a string str consisting of comma separated words. Our task is to find the first maximum length, even word, from a string.

We need to find the largest word 'string between two spaces' whose length is maximum and even.

Let's take an example to understand the problem,

Input : str = "learn programming at TutorialsPoint"
Output : TutorialsPoint

Explanation −

The string with even length is TutorialsPoint.

Solution Approach

A simple solution to the problem is by simply finding the string which has even length greater than the current string. Initialise the maxString length to 0.

Algoritham

Step 1 − Iterate over the string.

Step 2 − check if the current word has even length and the length of word is greater than last greater word.

Step 3 − Return the word.

Example

Program to illustrate the working of our solution

#include <bits/stdc++.h>
using namespace std;
string findMaxEvenLenWord(string str) {
   int len = str.length();
   int i = 0; int currWordlen = 0;
   int maxWordLen = 0;
   int stringPointer = -1;
   while (i < len) {
      if (str[i] == ' ') {
         if (currWordlen % 2 == 0) {
            if (maxWordLen < currWordlen) {
               maxWordLen = currWordlen;
               stringPointer = i - currWordlen;
            }
         }
         currWordlen = 0;
      }
      else {
         currWordlen++;
      }
      i++;
   }
   if (currWordlen % 2 == 0) {
      if (maxWordLen < currWordlen) {
         maxWordLen = currWordlen; 
         stringPointer = i - currWordlen;
      }
   }
   if (stringPointer == -1)
      return "Not Found!";
   return str.substr(stringPointer, maxWordLen);
}
int main() {
   string str = "Learn programming at Tutorialspoint";
   cout<<"The maximum length even word is '"<<findMaxEvenLenWord(str)<<"'";
   return 0;
}

Output

The maximum length even word is 'Tutorialspoint'