char classification [counting letters, points, commas and white-spaces]

Bjarne Stroustrup “Programming Principles and Practice Using C++”
Chapter 11 Exercise 14
Using std_lib_facilities.h by Bjarne Stroustrup.

[code language=”cpp”]
// Philipp Siedler
// Bjarne Stroustrup’s PPP
// Chapter 11 Exercise 14

#include "std_lib_facilities.h"

int main()
try
{
cout << "enter name for input file" << endl;
string iname = "input/";
string itemp;
cin >> itemp;
iname += itemp;
ifstream ifs{ iname };
if (!ifs) { cout << "could not open input file." << endl; }

int letters = 0;
int pointComma = 0;
int wss = 0;

for (char ch; ifs.get(ch);) {
if (isspace(ch)) {
wss++;
}
else if (ch == ‘,’ || ch == ‘.’) {
pointComma++;
}
else {
letters++;
}
}

cout << "Letters: " << letters << endl;
cout << "Point’s & Comma’s: " << pointComma << endl;
cout << "Whitespaces: " << wss << endl;

keep_window_open();
}
catch (runtime_error e) {
cout << e.what() << endl;
keep_window_open();
}
catch (…) {
cout << "Exiting" << endl;
keep_window_open();
}
[/code]

Output:
enter name for input file
p409_14_blind_text.txt
Letters: 1106
Point's & Comma's: 63
Whitespaces: 199

Input-File: p409_14_blind_text.txt
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Donec pede justo, fringilla vel, aliquet nec, vulputate eget, arcu.
In enim justo, rhoncus ut, imperdiet a, venenatis vitae, justo.
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Cras dapibus. Vivamus elementum semper nisi. Aenean vulputate eleifend tellus.
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Etiam rhoncus. Maecenas tempus, tellus eget condimentum rhoncus, sem quam semper libero, sit amet adipiscing sem neque sed ipsum.
Nam quam nunc, blandit vel, luctus pulvinar, hendrerit id, lorem. Maecenas nec odio et ante tincidunt tempus.
Donec vitae sapien ut libero venenatis faucibus. Nullam quis ante. Etiam sit amet orci eget eros faucibus tincidunt.
Duis leo. Sed fringilla mauris sit amet nibh. Donec sodales sagittis magna. Sed consequat, leo eget bibendum sodales, augue velit cursus nunc,