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Assigning a Char Value to a Vector Element. C++


By : Nuzhat Shaikh
Date : October 17 2020, 06:10 AM
wish helps you You could try a std::map to create a mapping between a choice letter and an animal string. It makes it easier to query the map with a key for the associated value, here's an example:
code :
#include <iostream>
#include <map>

int main() {

    // making a mapping between two strings, a letter and animal
    std::map<std::string, std::string> pet = {{"a", "Snake"},
                                              {"b", "Bird"},
                                              {"c", "Fish"},
                                              {"d", "Turtle"}};
    // dialogue
    std::cout << "Select a pet: " << std::endl;
    std::cout << "(a) " << pet.at("a") << std::endl;
    std::cout << "(b) " << pet.at("b") << std::endl;
    std::cout << "(c) " << pet.at("c") << std::endl;
    std::cout << "(d) " << pet.at("d") << std::endl;

    // read input into a string variable
    std::string choice;
    std::cin >> choice;

    // output selected letter mapping to animal
    std::cout << "You selected a " << pet.at(choice) << std::endl;

    return 0;
}


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Assigning vector::iterator to char array post VS 2003


By : Cai
Date : March 29 2020, 07:55 AM
To fix the issue you can do The proper solution would be to template FindNumMsgs such that it can work with either iterators or pointers (since pointers can be used as iterators just fine). Something like this:
code :
template <class T>
int FindNumMsgs(T it, int count) {
    while(count--) {
        // do whatever
        it++;
    }
    return n;
}

Determining most freq char element in a vector<char>?


By : flaimah
Date : March 29 2020, 07:55 AM
To fix the issue you can do If you are only using regular ascii characters, you can make the solution a bit faster - instead of using a map, use an array of size 256 and count the occurrences of the character with a given code 'x' in the array cell count[x]. This will remove an logarithm(256) from your solution and thus will make it a bit faster. I do not think much more can be done with respect to optimization of this algorithm.

push_back all contents in vector<char> to combine them as the first element of vector<string>


By : Christian S
Date : March 29 2020, 07:55 AM
this will help The problem is that you are trying to push a std::vector where a std::string is expected. So simply change the type of myBuffer to a std::string:
code :
#include <iostream>
#include <string>

int main() {
    std::string mySentence;
    std::getline(std::cin, mySentence);

    std::vector<std::string> myWords;
    std::string myBuffer;

    for (int i = 0; i < mySentence.length(); i++) {
        if (mySentence[i] != ' ')
            myBuffer.push_back(mySentence[i]);
        else {
            myWords.push_back(myBuffer);
            myBuffer.clear();
        }
    }

    if (!myBuffer.empty()) {
        myWords.push_back(myBuffer);
    }

    // use myWords as needed...

    return 0;
}
#include <iostream>
#include <string>
#include <sstream>

int main() {
    std::string mySentence;
    std::getline(std::cin, mySentence);

    std::vector<std::string> myWords;
    std::string myBuffer;

    std::istringstream iss(mySentence);
    while (iss >> myBuffer) {
        myWords.push_back(myBuffer);
    }

    // use myWords as needed...

    return 0;
}
#include <iostream>
#include <string>
#include <sstream>
#include <iterator>

int main() {
    std::string mySentence;
    std::getline(std::cin, mySentence);

    std::vector<std::string> myWords;

    std::istringstream iss(mySentence);
    std::copy(
        std::istream_iterator<std::string>(iss),
        std::istream_iterator<std::string>(),
        std::back_inserter(myWords)
    );

    // use myWords as needed...

    return 0;
}

Could I pass an address of the first element of a vector of vector directly to a function which expects an unsigned char


By : farzyyy
Date : March 29 2020, 07:55 AM
hope this fix your issue Yes, you must convert them into one vector, for the first vector doesn't need to be continuous with the second vector.

Assigning to vector of char[8]


By : subhash Yadav
Date : September 29 2020, 08:00 PM
To fix the issue you can do You can'ṭ have a std::vector because char[8] does not satisfy the requirements of std::vector for the value type. In praticular, the value type is required to be Erasable, which char[8] is not given the default allocator.
You can use std::vector> instead. std::array is not only Erasable, but is also assignable.
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