Question

2) Write a C++ program that accepts a sentence as an input from the user. Do the following with the sentence. Please use C++ style string for this question.

1) Count the number of letters in the input

2) Change all lower case letters of the sentence to the corresponding upper case

Answer 1

#include <iostream>

#include <string>

using namespace std;

int main()

{

    string input;

    // read a sentence from user

    cout << "Enter a sentence: ";

    getline(cin, input);

    // 1) Count the number of letters in the input

    int count = 0;

    for (int i = 0; i < input.size(); i++)

    {

        // if current symbol is a letter

        if ((input[i] >= 'a' && input[i] <= 'z') || (input[i] >= 'A' && input[i] <= 'Z'))

            count++;

    }

    cout << "\nTotal letters: " << count << endl;

    // 2) Change all lower case letters of the sentence to the corresponding upper case

    for (int i = 0; i < input.size(); i++)

    {

        // if current letter is in lowercase

        if (input[i] >= 'a' && input[i] <= 'z')

            // convert to uppercase

            input[i] -= 'a' - 'A';

    }

    cout << "\nConverted to uppercase: " << input << endl;

}

.

Output:

.