Constexpr Errors [closed] - c++

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Okay I fixed the errors. Thank you guys. But now when I run it, I choose D in the menu but only "You chose to split the words & remove the duplicates in the paragraph" & "This is it:" prints out. It doesn't show anything after that ... Anyone know what it could be? Thank you in advance!!
This is how it should be:
When the 4th choice (“Split Words”) is selected, the words should be put into an array or a structure of your and each word should be displayed with a loop. After this duplicate removal should be performed and the program must determine the duplicate words and eliminate them. After this, the word list should be printed again
#include <iostream>
#include <cmath>
#include <cstdlib>
#include <string>
#include <algorithm>
#include <cctype>
#include <sstream>
#include <set>
using namespace std;
int main()
{
string s;
char selection;
string w;
string buf;
cout << "Enter a paragraph or a sentence : " ;
getline(cin, s);
int sizeOfString = s.length();
//cout << "The paragraph has " << sizeOfString << " characters. " << endl; ***Dummy call to see if size works.
//cout << "You entered " << s << endl; *** Dummy function !!
cout << "" << endl;
cout << " Menu " << endl;
cout <<" ------------------------" << endl;
cout << "" << endl;
cout << "A -- Convert paragraph to all caps " << endl;
cout << "B -- Convert paragraph to all lowercase " << endl;
cout << "C -- Delete whitespaces " << endl;
cout << "D -- Split words & remove duplicates " << endl;
cout << "E -- Search a certain word " << endl;
cout << "" << endl;
cout << "Please select one of the above: " ;
cin >> selection;
cout << "" << endl;
stringstream ss(s);
set<string> tokens;
switch (selection) //Switch statement
{
case 'a':
case 'A': cout << "You chose to convert the paragraph to all uppercase" << endl;
cout << "" << endl;
for(int i=0; s[i]!='\0'; i++)
{
s[i]=toupper(s[i]);
}
cout << "This is it: " << s << endl;
break;
case 'b':
case 'B': cout << "You chose to convert the paragragh to all lowercase" << endl;
cout << "" << endl;
for (int i=0; s[i] !='\0'; i++)
{
s[i]=tolower(s[i]);
}
cout << "This is it: " << s << endl;
break;
case 'c':
case 'C': cout << "You chose to delete the whitespaces in the paragraph" << endl;
cout << "" << endl;
for(int i=0; i<s.length(); i++)
if(s[i] == ' ') s.erase(i,1);
cout <<"This is it: " << s << endl;
break;
case 'd':
case 'D': cout << "You chose to split the words & remove the duplicates in the paragraph" << endl;
cout << "" << endl;
// Insert the string into a stream
// Create vector to hold our words
while (ss >> buf)
tokens.insert(buf);
cout << "This is it: " << endl;
for (set<string>::iterator it = tokens.begin(); it != tokens.end(); ++it)
{
cout << *it << " ";
}
cout << endl;
break;
case 'e':
case 'E': cout << "You chose to search for a certain word in the paragraph. " << endl;
cout << "" << endl;
cout << "Enter the word you want to search for: ";
cin >> w;
s.find(w);
if ( s.find( w ) != std::string::npos )
{
cout << w << " was found in the paragraph. " << endl;
}
else
{
cout << w << " was not found in the paragraph. " << endl;
}
}
return 0;
}

Answer 1

1)
set<s>::iterator
should be
set<string>::iterator
2) Add brackets around the case statements for the local variables.
case 'D':{
}
break;
case 'e':
case 'E':{
}
break;

Answer 2

You are creating stringstream with empty string, which, in turn leads to stream being empty. Consider creating stringstream object after you actually read the string. stringstream doesn't hold a reference to your string object, so any modification to a string the stringstream was based on, doesn't reflect those changes in the stream.