Question

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

Answer 1

#include <stdio.h>

// In a permutation, the subset elements are listed in a specific order.

void create_2_letters_permutation(char letters[], int size) {
    for (int i = 0; i < size; i++) {
        for (int j = 0; j < size; j++) {
            if (i != j) { // Ensure different letters
                printf("%c%c\n", letters[i], letters[j]);
            }
        }
    }
}

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

    create_2_letters_permutation(letters, size);

    return 0;
}



/*
run:

AB
AC
AD
BA
BC
BD
CA
CB
CD
DA
DB
DC

*/

 

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