Decision tables: Difference between revisions

=={{header|C++}}==

{{trans|Java}}

<lang cpp>#include <iostream>

#include <string>

#include <vector>

const std::vector<std::pair<std::string, std::string>> conditions = {

{"Printer prints", "NNNNYYYY"},

{"A red light is flashing", "YYNNYYNN"},

{"Printer is recognized by computer", "NYNYNYNY"}

};

const std::vector<std::pair<std::string, std::string>> actions = {

{"Check the power cable", "NNYNNNNN"},

{"Check the printer-computer cable", "YNYNNNNN"},

{"Ensure printer software is installed", "YNYNYNYN"},

{"Check/replace ink", "YYNNNYNN"},

{"Check for paper jam", "NYNYNNNN"},

};

int main() {

const size_t nc = conditions.size();

const size_t na = actions.size();

const size_t nr = conditions[0].second.size();

const int np = 7;

auto answers = new bool[nc];

std::string input;

std::cout << "Please answer the following questions with a y or n:\n";

for (size_t c = 0; c < nc; c++) {

char ans;

do {

std::cout << conditions[c].first << "? ";

std::getline(std::cin, input);

ans = std::toupper(input[0]);

} while (ans != 'Y' && ans != 'N');

answers[c] = ans == 'Y';

}

std::cout << "Recommended action(s)\n";

for (size_t r = 0; r < nr; r++) {

for (size_t c = 0; c < nc; c++) {

char yn = answers[c] ? 'Y' : 'N';

if (conditions[c].second[r] != yn) {

goto outer;

}

}

if (r == np) {

std::cout << " None (no problem detected)\n";

} else {

for (auto action : actions) {

if (action.second[r] == 'Y') {

std::cout << " " << action.first << '\n';

}

}

}

break;

outer: {}

}

delete[] answers;

return 0;

}</lang>

{{out}}

<pre>Please answer the following questions with a y or n:

Printer prints? n

A red light is flashing? n

Printer is recognized by computer? n

Recommended action(s)

Check the power cable

Check the printer-computer cable

Ensure printer software is installed</pre>