Chapter 7, Problem 1PSCS

Program Plan Intro

Program plan:

1. Declare a variable file of ifstream type to read the input from the file.
2. Declare a variable letter of type char to store the letter read from the file.
3. Declare 6 variables upperCounter, lowerCounter, blank, digit, punctuation, allElseCounter of type int to store the counter of each type.
4. Declare a variable inFile of type String to store the name of the file read from the user.
5. A do- while loop is used to read letters from the file and to increment the each type of counter.
6. A switch is used to check for each type of letters and to increment the counter inside do-while loop.

Program description:

The main purpose of the program is to summarize all the contents of the file in a table with details of each type of character scanned.

Explanation of Solution

Program:

//inclusion of header files
#include <fstream> 
#include <iostream> 
#include <iomanip>
#include <cctype> 
//using namespace
using namespace std;
//main function
int main() 
{
ifstream file; //fstream input
char letter; 
// Declaration and Initialization of variables
int upperCounter = 0; // counter for uppercase letters
int lowerCounter = 0; // counter for lowercase letters
int blank = 0; // counter for blanks
int digit = 0; //counter for digits
int punctuation = 0; //counter for punctuation
int allElseCounter = 0; //counter for Remaining counters
//Declare variable to store filename
string inFile;
cout<<"Enter the filename to be processed" << endl;
cin>>inFile;
//open the file
file.open(inFile.c_str()); 
//if file doesn’t get opened
if (!file) 
{
    cout<< "Filename doesn’t exist." << endl;
    return 1; 
}
//else read the characters 
file.get(letter); // Input one letter 
do 
// process each letter
{
if (isupper(letter)) 
upperCounter++; 
else if (islower(letter)) 
lowerCounter++; 
else if (isdigit(letter)) 
digit++;
else 
switch (letter) 
{ 
case ' ' : blank++;
            break;
case '.' :
case '?' :
case '!' : punctuation++; 
            break; 
default : allElseCounter++; 
            break; 
} 
file.get(letter); 
} while (file);
// Calculate total 
float total = upperCounter + lowerCounter + blank + digit + punctuation + allElseCounter;
cout<<"Summary of letters: "<<  inFile << endl;
// Letters of each type
cout<<fixed<<setprecision(3)<<"Percentage of uppercase letters:"<<upperCounter / total* 100<<endl; 
cout<<fixed<<setprecision(3)<< "Percentage of lowercase letters:" << lowerCounter / total * 100 << endl; 
cout<<fixed<<setprecision(3)<< "Percentage of blanks: "<< blank / total * 100 << endl;
cout<<fixed<<setprecision(3)<< "Percentage of digits: "<< digit / total * 100 << endl; 
cout<<fixed<<setprecision(3)<< "Percentage of end-of-sentence: "<< "punctuation "<< punctuation / total * 100 << endl;
return 0;
}

Explanation:

In this program, first of all, the user is asked to enter the filename which needs to be processed. After entering the filename, all the characters of it are scanned to get a summary table of each type of letters. Each letter is scanned for uppercase letters, lowercase letters, for digits, blanks, and for any puctuations. Each type counter get incremented if the letter scanned is of that type. For example, if the letter scanned is of uppercase then the counter for uppercase letters will get incremented and so on. In the end, complete summary of all types of letters is printed on the screen with the filename which is scanned as shown in the output.

Output:

Contents of the file Unclewill.txt: