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C++ program to change the string from lowercase to uppercase using class

Submitted by Shubh Pachori, on August 13, 2022

Problem statement

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

Example:

Input:
Enter String: sHuBh

Output:
Uppercased String: SHUBH

C++ code to change the string from lowercase to lowercase 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;
    }

  // uppercase() function is to manipulate the string
  string uppercase() {
    // 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++) {

      // if condition to check if the character is in lowercase
      if (str[index] >= 'a' && str[index] <= 'z') {

        // if the character is in lowercase then it will be converted to uppercase
        temp_str[index] = str[index] - 32;
      }

      // else 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();

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

  cout << "Uppercased String:" << s;

  return 0;
}

Output

Enter String:Hello 
Uppercased String:HELLO

Explanation

In the above code, we have created a class String, one char type array data member str[30] to store the string, and two public member functions getString() and uppercase() 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 upperercase() member function to change the case from lowercase to the uppercase of the given string. The uppercase() function contains the logic to change the case of the given string and printing the result.

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