diff --git a/A13/archiv/102-logop.c b/A13/archiv/102-logop.c
new file mode 100644
index 0000000..6ade964
--- /dev/null
+++ b/A13/archiv/102-logop.c
@@ -0,0 +1,26 @@
+#include <stdio.h>
+#include <stdalign.h>
+
+// Logical Operators //
+// If we got 90 or higher
+// AND
+// If we have less than 50 bucks
+
+int main()
+{
+
+    int money;
+    int grade;
+
+    printf("Enter money and grade: \n");
+    scanf("%d%d", &money, &grade);
+
+    if (money < 50 && grade > 90)
+
+        if (money < 50 || grade > 90)
+
+            if (!(grade > 80))
+                printf("Good Job! \n");
+
+    return 0;
+}
\ No newline at end of file
diff --git a/A13/archiv/105-inter-calc.c b/A13/archiv/105-inter-calc.c
new file mode 100644
index 0000000..2c10d3c
--- /dev/null
+++ b/A13/archiv/105-inter-calc.c
@@ -0,0 +1,45 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+int main()
+{
+    char operation;
+    float num1, num2;
+
+    printf("Welche Rechenoperation möchten sie durchführen? \n");
+    printf("+, -, /, * - Bitte geben Sie das Zeichen ein: \n");
+
+    scanf("%c", &operation);
+
+    printf("Bitte geben sich 2 Zahlen ein!\n");
+    printf("num 1: ");
+    scanf("%f", &num1);
+    printf("num 2: ");
+    scanf("%f", &num2);
+
+    switch (operation)
+    {
+    case '+':
+        printf("%.2f %c %.2f = %.2f \n", num1, operation, num2, num1 + num2);
+        break;
+
+    case '-':
+        printf("%.2f %c %.2f = %.2f \n", num1, operation, num2, num1 - num2);
+        break;
+
+    case '*':
+        printf("%.2f %c %.2f = %.2f \n", num1, operation, num2, num1 * num2);
+        break;
+
+    case '/':
+        printf("%.2f %c %.2f = %.2f \n", num1, operation, num2, num1 / num2);
+        break;
+
+    default:
+        printf("ERROR - falsche Eingabe! \n");
+
+        break;
+    }
+
+    return 0;
+}
\ No newline at end of file
diff --git a/A13/archiv/8.+Switch+-+Case.c b/A13/archiv/8.+Switch+-+Case.c
new file mode 100644
index 0000000..8e3bf2d
--- /dev/null
+++ b/A13/archiv/8.+Switch+-+Case.c
@@ -0,0 +1,31 @@
+//Made by Vlad. Budnitski.
+//AlphaTech - Programming Course.
+
+#include <stdio.h>
+#include <stdlib.h>
+
+int main()
+{
+    char grade; // not an int, yes? :)
+    printf("Enter your grade (A-F) : ");
+    scanf("%c", &grade);
+    switch (grade) // Specifying Variable
+    {
+    case 'A': // grade == 'A'
+        printf("Grade between 90-100 \n");
+        break;
+    case 'B': // grade == 'B'
+        printf("Grade between 80-89 \n");
+        break;
+    case 'C': // grade == 'C'
+        printf("Grade between 70-79 \n");
+        break;
+    case 'D': // grade == 'D'
+        printf("Grade between 60-69 \n");
+        break;
+    default:
+        printf("ERROR.. Try Again! \n");
+        break;
+    }
+    return 0;
+}
\ No newline at end of file
diff --git a/A13/archiv/9.+Milestone+-+Intermediate+Calculator+Solution.c b/A13/archiv/9.+Milestone+-+Intermediate+Calculator+Solution.c
new file mode 100644
index 0000000..b44d193
--- /dev/null
+++ b/A13/archiv/9.+Milestone+-+Intermediate+Calculator+Solution.c
@@ -0,0 +1,44 @@
+//Made by Vlad. Budnitski.
+//AlphaTech - Programming Course.
+
+#include <stdio.h>
+
+int main()
+{
+    int num1, num2;
+    char mathOperation;
+    printf("Enter what math operation you would like to use : ('+', '-', ..): ");
+    scanf("%c", &mathOperation);
+    printf("Enter num1: ");
+    scanf("%d", &num1);
+    printf("Enter num2: ");
+    scanf("%d", &num2);
+
+    switch (mathOperation)
+    {
+    case '+':
+        printf("%d %c %d = %d\n", num1, mathOperation, num2, num1 + num2);
+        break;
+    case '-':
+        printf("%d %c %d = %d\n", num1, mathOperation, num2, num1 - num2);
+        break;
+    case '*':
+        printf("%d %c %d = %d\n", num1, mathOperation, num2, num1 * num2);
+        break;
+    case '/':
+        if (num2 == 0)
+            printf("You cannot divide by 0! \n");
+        else
+            printf("%d %c %d = %d\n", num1, mathOperation, num2, num1 / num2);
+        break;
+    case '%':
+        if (num2 == 0)
+            printf("You cannot divide by 0! \n");
+        else
+            printf("%d %c %d = %d\n", num1, mathOperation, num2, num1 % num2);
+        break;
+    default:
+        printf("Wrong mathematical operation.. Try again. \n");
+        break;
+    }
+}
\ No newline at end of file
diff --git a/A13/archiv/switch-case-0.c b/A13/archiv/switch-case-0.c
new file mode 100644
index 0000000..7693540
--- /dev/null
+++ b/A13/archiv/switch-case-0.c
@@ -0,0 +1,33 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+int main()
+{
+
+    char grade;
+    printf("Enter your grade (A-F): ");
+    scanf("%c", &grade);
+
+    if (grade == 'A')
+        printf("You have a score within a range of 90-100 point.\n");
+
+    else if (grade == 'B')
+        printf("You have a score within a range of 80-89 point.\n");
+
+    else if (grade == 'C')
+        printf("You have a score within a range of 70-79 point.\n");
+
+    else if (grade == 'D')
+        printf("You have a score within a range of 60-69 point.\n");
+
+    else if (grade == 'E')
+        printf("You have a score within a range of 50-59 point.\n");
+
+    else if (grade == 'F')
+        printf("You have a score within a range of 0-49 point.\n");
+
+    else
+        printf("Oh. Something went wrong.\n");
+
+    return 0;
+}
\ No newline at end of file
diff --git a/A13/archiv/switch-case-1.c b/A13/archiv/switch-case-1.c
new file mode 100644
index 0000000..d99a78f
--- /dev/null
+++ b/A13/archiv/switch-case-1.c
@@ -0,0 +1,37 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+int main()
+{
+
+    char grade;
+    printf("Enter your grade (A-F): ");
+    scanf("%c", &grade);
+
+    switch (grade)
+    {
+    case 'A':
+        printf("Grade between 90-100\n");
+        break;
+    case 'B':
+        printf("Grade between 80-89\n");
+        break;
+    case 'C':
+        printf("Grade between 70-79\n");
+        break;
+    case 'D':
+        printf("Grade between 60-69\n");
+        break;
+    case 'E':
+        printf("Grade between 50-59\n");
+        break;
+    case 'F':
+        printf("Grade between 0-49\n");
+        break;
+    default:
+        printf("ERROR.. Try Again! \n");
+        break;
+    }
+
+    return 0;
+}
\ No newline at end of file
diff --git a/A13/archiv/ten_op_1.c b/A13/archiv/ten_op_1.c
new file mode 100644
index 0000000..b8c278e
--- /dev/null
+++ b/A13/archiv/ten_op_1.c
@@ -0,0 +1,32 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+int main()
+{
+    int val1, val2, val3, auswertung;
+    printf("EQUAL or NOT EQUAL\n");
+
+    printf("Value 1: ");
+    scanf("%i", &val1);
+
+    printf("Value 2: ");
+    scanf("%i", &val2);
+
+    auswertung = (val1 == val2) ? 1 : 2;
+    // printf("Auswertung: %i\n", auswertung);
+
+    switch (auswertung)
+    {
+    case 1:
+        printf("%i and %i are equal\n", val1, val2);
+        break;
+
+    case 2:
+        printf("%i and %i are not equal\n", val1, val2);
+        break;
+
+    default:
+        break;
+    }
+    return 0;
+}
\ No newline at end of file
diff --git a/A13/archiv/ten_op_2.c b/A13/archiv/ten_op_2.c
new file mode 100644
index 0000000..b39f8d5
--- /dev/null
+++ b/A13/archiv/ten_op_2.c
@@ -0,0 +1,38 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+/* Frage 1: Write a program that reads from the user 2 values
+of an "integer" type. The program should print "EQUAL" if both
+the values are equal. Otherwise, the program should print "NOT EQUAL". */
+
+int main()
+{
+    int val1, val2, val3, auswertung;
+    printf("EQUAL or NOT EQUAL\n");
+
+    printf("Value 1: ");
+    scanf("%i", &val1);
+
+    printf("Value 2: ");
+    scanf("%i", &val2);
+
+    printf("Value 3: ");
+    scanf("%i", &val3);
+    auswertung = (val1 == val2 && val2 == val3) ? 1 : 2;
+    printf("Auswertung: %i\n", auswertung);
+
+    switch (auswertung)
+    {
+    case 1:
+        printf("%i and %i and %i are equal\n", val1, val2, val3);
+        break;
+
+    case 2:
+        printf("%i and %i and %i are not equal\n", val1, val2, val3);
+        break;
+
+    default:
+        break;
+    }
+    return 0;
+}
\ No newline at end of file
diff --git a/A13/archiv/ten_op_3.c b/A13/archiv/ten_op_3.c
new file mode 100644
index 0000000..2594af7
--- /dev/null
+++ b/A13/archiv/ten_op_3.c
@@ -0,0 +1,32 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+int main()
+{
+    int value;
+
+    int first, second, third;
+
+    printf("Geben Sie eine dreistellige Zahl ein: \n");
+    scanf("%i", &value);
+
+    first = value / 100;
+    printf("first: %i\n", first);
+
+    second = (value - first * 100) / 10;
+    printf("second: %i\n", second);
+
+    third = (value - first * 100) - second * 10;
+    printf("third: %i\n", third);
+
+    if (first < second && second < third)
+    {
+        printf("ASCENDING\n");
+    }
+    else
+    {
+        printf("NOT ASCENDING\n");
+    }
+
+    return 0;
+}
\ No newline at end of file
diff --git a/A13/output/105-inter-calc.exe b/A13/output/105-inter-calc.exe
new file mode 100644
index 0000000..03d17c9
Binary files /dev/null and b/A13/output/105-inter-calc.exe differ
diff --git a/A13/output/switch-case-0.exe b/A13/output/switch-case-0.exe
new file mode 100644
index 0000000..b523b31
Binary files /dev/null and b/A13/output/switch-case-0.exe differ
diff --git a/A13/output/switch-case-1.exe b/A13/output/switch-case-1.exe
new file mode 100644
index 0000000..ed32596
Binary files /dev/null and b/A13/output/switch-case-1.exe differ
diff --git a/A13/output/ten_op_2.exe b/A13/output/ten_op_2.exe
new file mode 100644
index 0000000..92e74ba
Binary files /dev/null and b/A13/output/ten_op_2.exe differ
diff --git a/A13/output/ten_op_4.exe b/A13/output/ten_op_4.exe
new file mode 100644
index 0000000..8e7da5f
Binary files /dev/null and b/A13/output/ten_op_4.exe differ
diff --git a/A13/output/ten_operator.exe b/A13/output/ten_operator.exe
new file mode 100644
index 0000000..f441c0b
Binary files /dev/null and b/A13/output/ten_operator.exe differ
diff --git a/A13/ten_op_4.c b/A13/ten_op_4.c
new file mode 100644
index 0000000..bd968e8
--- /dev/null
+++ b/A13/ten_op_4.c
@@ -0,0 +1,30 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+int main()
+{
+    int num;
+
+    printf("Please enter a number: \n");
+
+    scanf("%i", &num);
+
+    if (num < 0)
+    {
+        printf("-1");
+    }
+    else if (num > 0)
+    {
+        printf("1");
+    }
+    else if (num == 0)
+    {
+        printf("0");
+    }
+    else
+    {
+        printf("Error");
+    }
+
+    return 0;
+}
\ No newline at end of file