du3

du3/program.c

@@ -0,0 +1,32 @@
+#define __USE_XOPEN
+#define _GNU_SOURCE
+
+#include<stdio.h>
+#include<time.h>
+#include<stdlib.h>
+
+int main() {
+    char buffer[20];
+    struct tm tm;
+
+    char *retval = fgets(buffer, sizeof(buffer), stdin);
+
+    if (retval == 0) {
+        puts("Neplatny datum");
+        return 0;
+    }
+
+    retval = strptime(buffer, "%e.%m.%-Y", &tm);
+
+    if (retval == 0) {
+        puts("Neplatny datum");
+        return 0;
+    }
+
+    tm.tm_mday += 7;
+    
+    strftime(buffer, sizeof(buffer), "%e.%m.%-Y", &tm);
+    puts(buffer);
+    
+    return 0;
+}