Lecture 130:- Counting Words and Vowels in a String

To count the number of words and vowels in a string, you can use simple iteration and conditional checks. Here's a C++ program that demonstrates how to count words and vowels in a given string:

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#include <iostream> #include <string> #include <cctype> int countWords(const std::string& str) {    int wordCount = 0;    bool inWord = false;    for (char c : str) {        if (std::isalpha(c)) {            if (!inWord) {                inWord = true;                wordCount++;            }        } else {            inWord = false;        }    }    return wordCount; } int countVowels(const std::string& str) {    int vowelCount = 0;    const std::string vowels = "aeiouAEIOU";    for (char c : str) {        if (vowels.find(c) != std::string::npos) {            vowelCount++;        }    }    return vowelCount; } int main() {    std::string inputString;    std::cout << "Enter a string: ";    std::getline(std::cin, inputString);    int wordCount = countWords(inputString);    int vowelCount = countVowels(inputString);    std::cout << "Number of words: " << wordCount << std::endl;    std::cout << "Number of vowels: " << vowelCount << std::endl;    return 0; }

In this program, we define two functions: countWords and countVowels. The countWords function iterates through the characters of the input string and counts the number of words. It considers a word as a continuous sequence of alphabetic characters.

The countVowels function iterates through the characters of the input string and counts the number of vowels (both lowercase and uppercase).

The main() function takes user input for the string, and then calls the countWords and countVowels functions to calculate the word count and vowel count, respectively.

Sample Input:

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Enter a string: Hello, how are you?

Sample Output:

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Number of words: 4 Number of vowels: 6

This program provides a straightforward way to count the number of words and vowels in a given string.