Question

How to get the indexes of words from a vector of strings that start with a specific letter in C++

Answer 1

#include <iostream>
#include <vector>
#include <string>

std::vector<int> getIndexesOfWordsStartingWith(const std::vector<std::string>& words, char letter) {
    std::vector<int> indexes;
    int words_size = words.size();
    
    for (size_t i = 0; i < words_size; i++) {
        if (!words[i].empty() && words[i][0] == letter) {
            indexes.push_back(i);
        }
    }
    
    return indexes;
}

int main() {
    std::vector<std::string> words = {"zero", "one", "two", "three", "four", "five", 
                                      "six", "seven", "eight", "nine", "ten"};
    char specificLetter = 't';
    std::vector<int> indexes = getIndexesOfWordsStartingWith(words, specificLetter);

    std::cout << "Indexes of words starting with '" << specificLetter << "': ";
    for (int index : indexes) {
        std::cout << index << " ";
    }
}



/*
run:
   
Indexes of words starting with 't': 2 3 10 
   
*/

 

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