Question

String Processing Labs Directions: Write a main program to test the three functions described below, Input is from a file, and output is to a file. 1. The function Another parameter is a char variable with a letter value. The function outputs the number of times the char value appears in the string. processes a string containing letters of the alphabet, which is a parameter 2. This Boolean function has two string parameters. It returns true when the first str substring of the second string, otherwise it returns false. ing is a 3. The input is on one line in an input file, and has up to seven components with a colon ) at end of each component. The function separates each component into separate strings (without the colon), and outputs each separated string along with its length. In the output file, use one line for each separated string. One input sample could be George:April:May: William:Johnny: Another input could be Red:Fuscia:Magenta: A third input example is (note intemal spaces) Hello, there..How are you?:I'm fine. Let's go out to dinner. e pare tauses

Answer 1

C++ Program:

#include <iostream>
#include <fstream>
#include <string>

using namespace std;

//Function that counts number of characters present in a string
int charCount(string str, char ch)
{
    int i, cnt=0;

    //Iterating over each character
    for(i=0; i<str.size(); i++)
    {
        //Checking character
        if(str[i] == ch)
            cnt+=1;
    }

    //Returning count
    return cnt;
}

//Function that checks whether first string is a substring of another string
bool isSubstring(string str1, string str2)
{
    int s1Len = str1.length();
    int s2Len = str2.length();
    int i, j;

    // Iterating over string
    for (i = 0; i <= s2Len - s1Len; i++)
    {
        // Checking pattern
        for (j = 0; j < s1Len; j++)
        {
            //Comparing strings
            if (str2[i + j] != str1[j])
                break;
        }

        //Checking length
        if (j == s1Len)
            return true;
    }

    return false;
}

//Function that process input file
void processFile()
{
    string s;

    //Opening files
    fstream fin("ipFile.txt", ios::in);
    fstream fout("opFile.txt", ios::out);

    //Iterating over line by line
    while(fin.good())
    {
        getline(fin, s);
        string delimiter = ":";

        size_t pos = 0;

        string token;

        //Splitting line
        while ((pos = s.find(delimiter)) != std::string::npos)
        {
            token = s.substr(0, pos);
            fout << token << " " << token.size() << endl;
            s.erase(0, pos + delimiter.length());
        }
    }

    //Closing files
    fin.close();
    fout.close();
}

//Main function
int main()
{
    string str1="hello", str2="world", str3="ell";

    cout << "\n String 1: " << str1;
    cout << "\n String 2: " << str2;
    cout << "\n String 3: " << str3;

    //Counting function
    cout << "\n\n charCount(str1, 'l'): " << charCount(str1, 'l') << "\n";

    //Checking substring
    cout << "\n isSubstring(str3, str1): " << isSubstring(str3, str1);
    cout << "\n isSubstring(str2, str1): " << isSubstring(str2, str1);

    //Processing file
    processFile();
    cout << "\n\n File processed Successfully... \n";

    cout << endl;
    return 0;
}

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Sample Run:

$CTC StringProcesslbin\DebugStringProcess.exe String 1: hello String 2: world String 3 ell charCount (str1, 1) 2 ipFile.txt - Notepad File Edit Format View Help isSubstring (str3, str1): 1 isSubstring(str2, str1): 0 ed:Blue:Green: One:Two:Three: File processed Successfully... Process returned 0 (0x) execution time 0.140 s Press any key to continue. opFile.txt Notepad File Edit Format View Help Red 3 Blue 4 Green 5 One 3 wo Three 5$