Damm algorithm: Difference between revisions

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@@ Line 760: / Line 760: @@
 =={{header|C++}}==
 {{trans|C#|C sharp}}
-<syntaxhighlight lang="cpp">#include <sstream>
+<syntaxhighlight lang="cpp">#include <string>
+#include <cstdio>
-const int TABLE[][10] = {
+inline constexper int TABLE[][10] = {
 	{0, 3, 1, 7, 5, 9, 8, 6, 4, 2},
 	{7, 0, 9, 2, 1, 5, 4, 8, 6, 3},
@@ Line 775: / Line 777: @@
 };
-using std::string;
+[[nodiscard]] bool damm(std::string s) noexcept {
-bool damm(string s) {
 	int interim = 0;
-	for (char c : s) {
+	for (const auto c : s) {
 		interim = TABLE[interim][c - '0'];
 	}
@@ Line 785: / Line 786: @@
 int main() {
-	auto numbers = { 5724, 5727, 112946, 112949 };
+	for (const auto num : { 5724, 5727, 112946, 112949 }) {
+		if (damm(std::to_string(num))) {
-	for (int num : numbers) {
+	 	 	std::printf("%6d is valid\n", num);
-		using std::stringstream;
+		}
-		stringstream ss;
+		else std::printf("%6d is invalid\n", num);
-		ss << num;
-		bool isValid = damm(ss.str());
-		if (isValid) {
-			printf("%6d is valid\n", num);
-		} else {
-			printf("%6d is invalid\n", num);
-		}
 	}
-	return 0;
 }</syntaxhighlight>
 {{out}}