Data commit

Task/Palindrome-dates/C/palindrome-dates.c

@@ -0,0 +1,31 @@
+#include <stdbool.h>
+#include <stdio.h>
+#include <string.h>
+#include <time.h>
+
+bool is_palindrome(const char* str) {
+    size_t n = strlen(str);
+    for (size_t i = 0; i + 1 < n; ++i, --n) {
+        if (str[i] != str[n - 1])
+            return false;
+    }
+    return true;
+}
+
+int main() {
+    time_t timestamp = time(0);
+    const int seconds_per_day = 24*60*60;
+    int count = 15;
+    char str[32];
+    printf("Next %d palindrome dates:\n", count);
+    for (; count > 0; timestamp += seconds_per_day) {
+        struct tm* ptr = gmtime(&timestamp);
+        strftime(str, sizeof(str), "%Y%m%d", ptr);
+        if (is_palindrome(str)) {
+            strftime(str, sizeof(str), "%F", ptr);
+            printf("%s\n", str);
+            --count;
+        }
+    }
+    return 0;
+}