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C++ program to change the string to sentence case using class

Submitted by Shubh Pachori, on August 13, 2022

Problem statement

Given a string, we have to change its case to sentence case using the class and object approach.

Example:

Input:
Enter String: sHuBh

Output:
Sentence cased String: Shubh

C++ code to change the string to sentence case using class and object approach

#include <iostream>
using namespace std;

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

  //public functions for string manipulation
  public:

    //getString() functiom is to get 
    //the string
    void getString() {
      cout << "Enter String: ";
      cin >> str;
    }

  //sentanceCase() function is to manipulate 
  //the string
  string sentanceCase() {
    //declaring variables for operations
    char temp_str[30];
    int index;

    //for loop to read the whole string and make changes in it
    for (index = 0; str[index]; index++) {

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

        //if the first character is a lowercase then
        //it will converted to the uppercase
        if (str[index] >= 'a' && str[index] <= 'z') {
          temp_str[index] = str[index] - 32;
        }

        //else it will as it is copied
        else {
          temp_str[index] = str[index];
        }
      }

      //if condition for whole string to check if there is any character
      else if ((str[index] >= 'a' && str[index] <= 'z') || (str[index] >= 'A' && str[index] <= 'Z')) {

        //if there is a uppercase character in middle of the
        //string then it will be converted to lowercse
        if (str[index] >= 'A' && str[index] <= 'Z') {
          temp_str[index] = str[index] + 32;
        }

        //else it will copied as it is
        else {
          temp_str[index] = str[index];
        }
      }

      //if it is not a character then it will copied as it is
      else {
        temp_str[index] = str[index];
      }
    }

    //tranfering null
    temp_str[index] = 0;

    //return the edited string
    return temp_str;
  }
};

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

  //declare a string variable to store the string
  string s;

  //object is calling getString() function to get the string
  S.getString();

  //sentanceCase() function is called by the 
  //object to manipulate it
  s = S.sentanceCase();

  cout << "Sentance cased String: " << s;

  return 0;
}

Output

Enter String: includehelp
Sentance cased String: Includehelp

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 sentenceCase() 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 sentenceCase() member function to change the given string to sentence case. The sentenceCase () function contains the logic to change the given string to a sentence case and printing the result.

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