counting characters & digits ? @text file

SUNIL GUTTA

13y3k

Hi friends

Question is simple and here it goes :) i am looking for a normalized solution :)

Write a C++ program to read the file (irespective of content length i.e 10+ paragraphs ) and count the number of occurrences of each letter (ignore the letter case) and digit found in it.

For example, if the book had a single line (which is of course not the case in original case): "AaBCcc12" the program would display: A: 2 B: 1 C: 3 1: 1 2: 1

Cheers Ty :)

Kiran

7 Replies

Know the answer? Post it — somebody with the same question will find it here.

Vulpes13y ago
Accepted answer
Try this:

#include
#include
#include

using namespace std;

int main()
{
int letters[26]; // array to count letters
int digits[10]; // array to count digits

//initialize arrays to zero
for(int i = 0; i < 26; i++) letters[i] = 0;
for(int i = 0; i < 10; i++) digits[i] = 0;

ifstream file;
string filename;
string line;
int len;

cout << "Enter the name of the .txt file to be analyzed : ";
cin >> filename;
cout << endl;

file.open(filename.c_str());

if (file.fail())
{
cout << "Unable to find file " << endl;
file.close();
return 1;
}

while(!file.eof())
{
getline(file, line);
len = line.length();
if (len == 0) continue; // skip blank lines

for(int i = 0; i < len; i++)
{
char c = line.at(i);
if (c >= 65 && c <= 90)
{
letters[c - 65]++;
}
else if (c >= 97 && c <= 122)
{
letters[c - 97]++;
}
else if (c >= 48 && c <= 57)
{
digits[c - 48]++;
}
}
}

file.close();

// print results;
cout << endl;

for (char c = 'A'; c <= 'Z'; c++)
{
if (letters[c - 65] > 0) cout << c << " : " << letters[c - 65] << endl;
}

for (char c = '0'; c <= '9'; c++)
{
if (digits[c - 48] > 0) cout << c << " : " << digits[c - 48] << endl;
}

return 0;
}
SUNIL GUTTA13y ago
humm ty for the info ;) but i need assistance dude ... please do check the link provided above .. .. darn i tried like hell coud'nt manage to crack it up
Vulpes13y ago
Yes, you could have used getc instead of getline.

However, when reading whole files, it's generally best to read as many characters as you can into memory in one chunk.

This avoids having to return to the file buffer, the cache or the disk itself each time a character is read which is likely to be slower than reading them line by line.
SUNIL GUTTA13y ago
Humm same type of question but in different ways i.e diff content in text file //

Please can u check the link :)
http://www.c-sharpcorner.com/Forums/Thread/237742/calculation-on-text-file.aspx

Thank you
SUNIL GUTTA13y ago
Well can the above mentioned program done by putc & getc ?? above mentioned code is working perfect . . . just a question out of curiosity :)

Thank you
Vulpes13y ago
I normally create text files in (or copy them to) the program folder.

The system looks there first if you don't specify the full path of a file.

It also keeps everything together.
SUNIL GUTTA13y ago
Hi hi hi bro

it keeps on saying unable to find the find file ?

I usually save files on desktop :)

How to optimize the issue ? do i need to save the file in which location ?
program folder ?? else any remedy ?

Ty boss