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C++ program to count total words in the string using class

Submitted by Shubh Pachori, on August 25, 2022

Problem statement

Given a string, we have to count total words in the string using the class and object approach.

Example:

Input:
Enter String: "count words in string"

Output:
Total Words: 4

C++ code to count total words in the string using the class and object approach

#include <iostream>
using namespace std;

// create a class
class String {
  // private data member
  private:
    char str[30];

  // public functions
  public:
    // getString() function to get the string
    void getString() {
      cout << "Enter String:";
      cin.getline(str, 30);
    }

  // countWord() function to count words in the string
  int countWord() {
    // int type variables for operations
    int index, word = 0;

    // for loop for traversing the whole string
    for (index = 0; str[index]; index++) {

      // if condition for the first character
      if (index == 0) {

        // if condition to check if it is a alphabet
        if ((str[index] >= 'a' && str[index] <= 'z') || (str[index] >= 'a' && str[index] <= 'z')) {

          // the increment in the word of 1
          word++;
        }
      }
      // else if condition to check if it is a space at index
      else if (str[index] == ' ') {
        // increment in index of 1 to check next character
        index++;
        // if condition to check if it is a alphabet
        if ((str[index] >= 'a' && str[index] <= 'z') || (str[index] >= 'A' && str[index] <= 'Z')) {
          // increment in index of 1 to check next character
          word++;
        }
      }
    }

    // returning the counted word
    return word+1;
  }
};

int main() {
  // create an object
  String S;

  // function is called by the object 
  // to store the string
  S.getString();

  // int type variable to store counted words
  int word;

  // countWord() function is called by the object to  
  // find out the total words in the string
  word = S.countWord();

  cout << "Total Words:" << word;

  return 0;
}

Output

RUN 1:
Enter String:Hello world
Total Words:2

RUN 2:
Enter String:Welcome come to the world!
Total Words:5

Explanation

In the above code, we have created a class String, one char type array data member str[30] to store the string, and public member functions getString() and countWord() to store and manipulate the given string.

In the main() function, we are creating an object S of class String, reading a string by the user using the function getString() , and finally calling the countWord() member function to count total words in the string. The countWord() function contains the logic to count the total words in the string and printing the result.

C++ Class and Object Programs (Set 2) »