Question

c++

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need to be named Subsequences.h and pass test cpp file SubsequenceTester.cpp at the end of this question.

This assignment will help you solve a problem using recursion

Description

A subsequence is when all the letters of a word appear in the relative order of another word.

• Pin is a subsequence of Programming
• ace is a subsequence of abcde
• bad is NOT a subsequence abcde as the letters are not in order

This assignment you will create a Subsequence class to do the following:

• Add a constructor that takes only a single word argument
• Add a bool isSubsequence(string sub); a method that will return true if sub is a subsequence of the original word.
• Overload the operator<< using a friend function, such that information is given about the class. This will be used for your own debugging

Hints

Think about the following questions to help you set up the recursion...

• What strings are subsequences of the empty string
• What happens if the first character of the subsequence matches the first character of the text?
• What happens if it doesn't

Submission

To get you thinking of data good test cases, only the example test cases have been provided for you in the SubsequenceTester.cpp. It is your responsibility to come up with several other test cases. Think of good ones

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SubsequenceTester.cpp

#include <iostream>
#include "Subsequences.h"

using namespace std;

void checkCase(string, string, string, bool);

int main()
{
    /**
        Add several more test cases to thoroughly test your data
        checkCase takes the following parameters (name, word, possible subsequence, true/false it would be a subsequence)
    **/

    checkCase("Case 1: First Letter", "pin", "programming", true);
    checkCase("Case 2: Skipping Letters", "ace", "abcde", true);
    checkCase("Case 3: Out of order", "bad", "abcde", false);

    return 0;
}

void checkCase(string testCaseName, string sub, string sentence, bool correctResponse){
    Subsequences s(sentence);
    if(s.isSubsequence(sub) == correctResponse){
        cout << "Passed " << testCaseName << endl;
    }
    else{
        cout << "Failed " << testCaseName << ": " << sub << " is " << (correctResponse? "": "not ") << "a subsequence of " << sentence << endl;
    }
}

Answer 1

ANSWER:

C++ Code:

#include <iostream>

using namespace std;

int checkCase(string, string);

int main() {

string subsq, str;

int flag;

cout << "Enter substring : ";

getline(cin, subsq);

cout << "Enter string : ";

getline(cin, str);

flag = checkCase(subsq, str);

if(flag)

cout << subsq << " is a susequence of " << str;

else

cout << subsq << " is not a susequence of " << str;

return 0;

}

int checkCase(string sq, string st)

{

int subindex = 0, strindex = 0;

while(sq[subindex] != '\0')

{

while( (sq[subindex] != st[strindex]) && (st[strindex] != '\0'))

{

strindex++;

}

if(st[strindex] == '\0')

break;

subindex++;

strindex++;

}

if(sq[subindex] == '\0')

return 1;

else

return 0;

}

Please refer to the screenshots of the code to understand the indentation of the code.

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