Question

How to create 2 letters combination from A, B, C, and D in C++

Answer 1

#include <iostream>

// In a combination, the subset elements can be listed in any order.

void create_2_letters_combination(char letters[], int size) {
    for (int i = 0; i < size; i++) {
        for (int j = i + 1; j < size; j++) {
            std::cout << letters[i] << letters[j] << "\n";
        }
    } 
}

int main() {
    char letters[] = {'A', 'B', 'C', 'D'};
    int size = sizeof(letters) / sizeof(letters[0]);

    create_2_letters_combination(letters, size);
}



/*
run:

AB
AC
AD
BC
BD
CD

*/

 

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Answer 2

#include <iostream>
#include <vector>

// In a combination, the subset elements can be listed in any order.

void create_2_letters_combination(std::vector<char> letters) {
    int size = letters.size();
    
    for (int i = 0; i < size; i++) {
        for (int j = i + 1; j < size; j++) {
            std::cout << letters[i] << letters[j] << "\n";
        }
    } 
}

int main() {
    std::vector<char> letters = {'A', 'B', 'C', 'D'};

    create_2_letters_combination(letters);
}



/*
run:

AB
AC
AD
BC
BD
CD

*/

 

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