how to exit program by pressing Enter key

Question

// C++ program to count occurrences of a given

// character

#include <iostream>

#include <string>

using namespace std;

// Function that return count of the given

// character in the string

int countLetterInString(string phase , char c)

{

// Count variable

int cnt = 0;

for (int i=0;i<phase.length();i++)

// checking character in string

{

if (phase[i] == c)

cnt++;}

return cnt;

}

// Driver code

int main()

{
char c;
cout <<"This program counts number of specific characters in phrase."<<endl;
string str;
cout <<"Enter the phrase or hit Enter key to stop: ";
while(getline(cin, str)){
if( ??? )
{
break;
}
else
{
cout << "Enter character to count in phrase: "; cin>>c;

cout <<"There are "<< countLetterInString(str, c)<<" "<<c<<" in the phrase" << endl;
}
}
return 0;

}
can you guys help me which is need to be written in (???) so that when entering Enter key it will exit the program .

Answer 1

This was a quick test result from Code Playground:

if((short)(char)str[0] == 0)
break;

or alternatively,

if(str.length < 1)
break;

Outside Code Playground (in your PC) I don't know if that's the same case, just give it a try :)

Hth, cmiiw