diff --git a/bin/3_n_a_xor_encryption b/bin/3_n_a_xor_encryption
index 071fe97..ce9114b 100755
Binary files a/bin/3_n_a_xor_encryption and b/bin/3_n_a_xor_encryption differ
diff --git a/bin/3_n_b_scalarm b/bin/3_n_b_scalarm
index f388925..0cd595e 100755
Binary files a/bin/3_n_b_scalarm and b/bin/3_n_b_scalarm differ
diff --git a/bin/3_n_c_userdb b/bin/3_n_c_userdb
index e197d2c..71a285e 100755
Binary files a/bin/3_n_c_userdb and b/bin/3_n_c_userdb differ
diff --git a/bin/3_p_a_zaehlen b/bin/3_p_a_zaehlen
index 5728014..400ca21 100755
Binary files a/bin/3_p_a_zaehlen and b/bin/3_p_a_zaehlen differ
diff --git a/bin/3_p_b_transponieren b/bin/3_p_b_transponieren
index e2efbc7..145c170 100755
Binary files a/bin/3_p_b_transponieren and b/bin/3_p_b_transponieren differ
diff --git a/bin/3_p_c_parteien b/bin/3_p_c_parteien
index f05abc8..85bb260 100755
Binary files a/bin/3_p_c_parteien and b/bin/3_p_c_parteien differ
diff --git a/src/3_n_a_xor_encryption.c b/src/3_n_a_xor_encryption.c
index bcc845e..5b5f5c0 100644
--- a/src/3_n_a_xor_encryption.c
+++ b/src/3_n_a_xor_encryption.c
@@ -1 +1 @@
-#include <stdio.h>
#include <string.h>

#define MAX_LENGTH 31 // 30 characters + '\0' termination
#define SALT 15

int main() {
	char input[MAX_LENGTH];
	int offset = 0;
	char character;

	// prompt for input
	printf("Please enter message: ");
	while (offset + 1 < MAX_LENGTH && (character = getchar()) != '\n') {
		input[offset++] = character;
	}
	input[offset] = '\0';

	// encrypt message
	for (offset = 0; offset < strlen(input); offset++) {
		input[offset] ^= SALT;
	}
	printf("Encrypted message: %s\n", input);

	// decrypt message
	for (offset = 0; offset < strlen(input); offset++) {
		input[offset] ^= SALT;
	}
	printf("Decrypted message: %s\n", input);

	return 0;
}
\ No newline at end of file
+#include <stdio.h>
#include <string.h>

#define MAX_LENGTH 31 /*  30 characters + '\0' termination */
#define SALT 15

int main() {
	char input[MAX_LENGTH];
	int offset = 0;
	char character;

	/* prompt for input */
	printf("Please enter message: ");
	while (offset + 1 < MAX_LENGTH && (character = getchar()) != '\n') {
		input[offset++] = character;
	}
	input[offset] = '\0';

	/* encrypt message */
	for (offset = 0; offset < strlen(input); offset++) {
		input[offset] ^= SALT;
	}
	printf("Encrypted message: %s\n", input);

	/* decrypt message */
	for (offset = 0; offset < strlen(input); offset++) {
		input[offset] ^= SALT;
	}
	printf("Decrypted message: %s\n", input);

	return 0;
}
\ No newline at end of file
diff --git a/src/3_n_c_userdb.c b/src/3_n_c_userdb.c
index 23286db..e9139eb 100644
--- a/src/3_n_c_userdb.c
+++ b/src/3_n_c_userdb.c
@@ -17,7 +17,7 @@ int main() {
 	int count, offset;
 
 	for (offset = 0, count = 0; offset < MAX_ACCOUNTS; offset++, count++) {
-		printf("Should this user be activated? (0/1/-1): ");  // -1 for break input
+		printf("Should this user be activated? (0/1/-1): ");  /* -1 for break input */
 		fgets(input_buffer, BUFFER_SIZE, stdin);
 		users[offset].active = atoi(input_buffer);
 		if (users[offset].active == -1) {