Question

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

Answer 1

#include <stdio.h>

// 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++) {
            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_combination(letters, size);

    return 0;
}



/*
run:

AB
AC
AD
BC
BD
CD

*/

 

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