Count letter and digit inside a string - C++ STL

C++ examples for STL:string

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Description

Count letter and digit inside a string

Demo Code

#include <iostream>
#include <string>
#include <cctype>
using namespace std;
int main()//w w w  .j av  a  2 s. c  om
{
   string str = "This -123/ is 567 A ?<6245> Test! This -123/ is 567 A ?<6245> Test! ";
   char nextChar;
   int i;
   int numLetters = 0, numDigits = 0, numOthers = 0;
   cout << "The original string: " << str << "\nThis string contains " << int(str.length()) << " characters" << endl;
   // Check each character in the string
   for (i = 0; i < int(str.length()); i++)
   {
      nextChar = str.at(i);  // get a character
      if (isalpha(nextChar))
         numLetters++;
      else if (isdigit(nextChar))
      numDigits++;
      else
         numOthers++;
      }
      cout << "     " << numLetters << " letters" << endl;
      cout << "     " << numDigits << " digits" << endl;
      cout << "     " << numOthers << " other characters." << endl;
      cin.ignore();
      return 0;
}

Result


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