Question

15.20 Ch 9 Warm up: Parsing strings (C++)

(1) Prompt the user for a string that contains two strings separated by a comma. (1 pt)

• Examples of strings that can be accepted:
• Jill, Allen
• Jill , Allen
• Jill,Allen

Ex:

Enter input string:
Jill, Allen

(2) Report an error if the input string does not contain a comma. Continue to prompt until a valid string is entered. Note: If the input contains a comma, then assume that the input also contains two strings. (2 pts)

Ex:

Enter input string:
Jill Allen
Error: No comma in string.

Enter input string:
Jill, Allen

(3) Extract the two words from the input string and remove any spaces. Store the strings in two separate variables and output the strings. (2 pts)

Ex:

Enter input string:
Jill, Allen
First word: Jill
Second word: Allen

(4) Using a loop, extend the program to handle multiple lines of input. Continue until the user enters q to quit. (2 pts)

Ex:

Enter input string:
Jill, Allen
First word: Jill
Second word: Allen

Enter input string:
Golden , Monkey
First word: Golden
Second word: Monkey

Enter input string:
Washington,DC
First word: Washington
Second word: DC

Enter input string:
q

Answer 1

Program

#include<iostream>
#include<string.h>
#include <sstream>
using namespace std;
int main()
{
string input;

bool quit=false;
while(!quit)
{
bool isComma = false;  
do
{

//Prompt the user for a string that contains two strings separated by a comma.
cout <<"Enter input string: ";
getline (cin, input);
if (input == "q")       //If user is done
{
   quit = true;
   cout<<"Terminating..."<<endl;
   break;
}
else
{

   for ( int i = 0; i < input.length(); i++)
   {
   if (input[i] == ',')   //If there is a comma
       isComma = true;

   }
   //Report an error if the input string does not contain a comma.
   if (!isComma)  
   {
   cout << "Error: No comma in string." << endl << endl;
   }
   }
}while (!isComma);   //Continue to prompt until a valid string is entered.

if(!quit)   //If user is not done,
   {
      
       string first, second;
       istringstream stream(input);//Extract the two words from the input string and remove any spaces.
       //Store the strings in two separate variables and output the strings.
       getline(stream, first, ',');
       stream >> second;

       cout << "First word: " << first << endl;
       cout << "Second word: " << second << endl << endl;
   }
  

}//Continue until the user enters q to quit.
return 0;
}

Output

Enter input string: Jim,Allen
First word: Jim
Second word: Allen

Enter input string: Golden Monkey
Error: No comma in string.

Enter input string: Golden,Monkey
First word: Golden
Second word: Monkey

Enter input string: Washington, DC
First word: Washington
Second word: DC

Enter input string: q
Terminating...