Count letters. : File Utility « File « C++

1. C++
2. File
3. File Utility

Count letters.

 


#include <iostream>
#include <fstream>
#include <cctype>
using namespace std;

int alpha[26];

int main(int argc, char *argv[])
{
  char ch;

  if(argc!=2) {
    cout << "Usage: COUNT <source>\n";
    return 1;
  }

  ifstream in(argv[1]);

  if(!in) {
    cout << "Cannot open input file.\n";
    return 1;
  }

  // init alpha[]
  int i;
  for(i = 0; i <26; i++) alpha[ i ] = 0;

  while(!in.eof()) {
    ch = in.get();
    if(isalpha(ch)) { 
      ch = toupper(ch); 
      alpha[ch-'A']++;
    }
  };

  for(i = 0; i <26; i++) {
    cout << (char) ('A'+ i) << ": " << alpha[ i ] << '\n';
  }

  in.close();

  return 0;
}

           
         
  

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