Funções logicas

#include <iostream>

bool And(bool e1, bool e2){

    if (e1 == true && e2 == true)
        return true;
    else
        return false;

}

bool Or(bool e1, bool e2){

    if (e1 == false && e2 == false)
        return false;
    else
        return true;
}

bool nope(bool entry){
    if (entry == true)
        return false;
    else
        return true;
}

int main(){

    bool e1, e2, result, nResult;

    printf("Digite o primeiro valor: ");
    scanf_s("%d", &e1);
    printf("Digite o segundo valor: ");
    scanf_s("%d", &e2);

    result = And(e1, e2);
    printf("\nAND: %d\n", result);

    result = nope(result);
    printf("!AND: %d\n\n", result);

    result = Or(e1, e2);
    printf("OR: %d\n", result);

    result = nope(result);
    printf("!OR: %d\n\n", result);

    result = nope(e1);
    printf("!e1: %d\n", result);

    result = nope(e2);
    printf("!e2: %d\n", result);

    return 0;
}