CareerCup

is the question incomplete ?

Yes, it's incomplete like Epic's recruitment process.

/*
barring the first 3 vowels in a string , replace all vowels a e i o u, with '_' ,. At the same time not more than 4 vowels from the last shud be changed.
*/
#include<iostream>
#include<string>
using namespace std;

string replace_vowel(string s)
{
	if (s.length()<=3) return s;
	else
	{
		int count_front=0,count_rear=0;
		int index=-1;
		for (int i=0;i<3;i++)
		{
			index=s.find_first_of("aeiou",index+1);
			if (index!=string::npos)
				count_front++;
		}
		if (count_front<3) return s;
		else
		{
			int rear_index=s.length();
			while (count_rear<4)
			{
				rear_index=s.find_last_of("aeiou",rear_index-1);
				if (rear_index!=string::npos && rear_index>index)
					s[rear_index]='_';
					count_rear++;
			}
			return s;
		}
	}
}

int main ()
{
	cout << "Enter the string\n";
	string str;
	getline(cin,str);
	cout<<replace_vowel(str)<<endl;
}

package switchvow;

public class vow {
	public static void main(String[] args) {
		String str = "an apple a morning keeps me yawning"; 
		StringBuilder sb = new StringBuilder();
		char[] s=str.toCharArray();
		for(char c:s){
			System.out.print(c);}
		System.out.println("");
		int count=0;
		for(char c:s){	
			if(c=='a'||c=='e'||c=='i'||c=='o'||c=='u'){
				count++;
			}
			
		}
		int len=0;
		if(count<=7){
			len=count-3;
		}
		else{
			len=4;
		}
		for(int i=s.length-1;i>0;i--){
		  if(len>0){
			if(s[i]=='a'||s[i]=='e'||s[i]=='i'||s[i]=='o'||s[i]=='u'){
			
				sb.append("^"+s[i]);
				s[i]=(char) (s[i]-'a'+'A');	
				len--;
			} else {
				sb.append(s[i]);
			}
		  }else{
			  sb.append(s[i]);
		  }
		}	
			sb.append(s[0]);
			System.out.println(sb.reverse().toString());
		for(char c:s){
		System.out.print(c);}
	}
}