diff --git a/.gitignore b/.gitignore
index e257658..ec5dd94 100644
--- a/.gitignore
+++ b/.gitignore
@@ -32,3 +32,5 @@
 *.out
 *.app
 
+# VSC
+.vscode
diff --git a/Makefile b/Makefile
index edc4d3d..9e54b32 100644
--- a/Makefile
+++ b/Makefile
@@ -1,5 +1,6 @@
 setup:
 	mkdir build
+<<<<<<< HEAD
 sheet0:
 	g++ src/sheet0.cpp -o ./build/sheet0
 	chmod +x build/sheet0
@@ -9,3 +10,13 @@ pizza:
 	g++ src/pizza.cpp -o ./build/pizza
 	chmod +x build/pizza
 	build/pizza
+=======
+sheet00:
+	g++ src/sheet00.cpp -o ./build/sheet00
+	chmod +x build/sheet00
+	build/sheet00
+sheet01:
+	g++ src/sheet01.cpp -o ./build/sheet01
+	chmod +x build/sheet01
+	build/sheet01
+>>>>>>> 909c958f6aa3055932860f292e9dcf553a1965af
diff --git a/build/sheet01 b/build/sheet01
new file mode 100755
index 0000000..45423fd
Binary files /dev/null and b/build/sheet01 differ
diff --git a/src/sheet0.cpp b/src/sheet00.cpp
similarity index 100%
rename from src/sheet0.cpp
rename to src/sheet00.cpp
diff --git a/src/sheet01.cpp b/src/sheet01.cpp
new file mode 100644
index 0000000..f089d45
--- /dev/null
+++ b/src/sheet01.cpp
@@ -0,0 +1,230 @@
+#include <iostream>
+#include <string>
+#include <cmath>
+
+void a1()
+{
+    int n;
+    std::cout << "Enter an integer: ";
+    std::cin >> n;
+
+    std::cout << (n >= 0 && n <= 100) << '\n';
+}
+
+void b1()
+{
+    int n;
+    std::cout << "Enter an integer: ";
+    std::cin >> n;
+
+    if(n>0)
+    {
+        std::cout << n << " is greater than 0.\n";
+
+        if(n%4==0)
+        {
+            std::cout << n << " is also divisible by 4.\n";
+            
+            if(n%3==0)
+            {
+                std::cout << n << " is also divisible by 3.\n";
+            }
+            else
+            {
+                std::cout<< n << " is not divisible by 3.\n";
+            }
+        }
+        else
+        {
+            std::cout << n << " is not divisble by 4.\n";
+        }
+    }
+    else
+    {
+        std::cout << n << " is not greater than 0.\n";
+    }
+}
+
+void abcd2()
+{
+    std::string dna;
+    std::cout << "Enter a String: ";
+    std::cin >> dna;
+
+    int g = 0;
+    int a = 0;
+    int c = 0;
+    int t = 0;
+    int G = 0;
+    int A = 0;
+    int C = 0;
+    int T = 0;
+    for(char base : dna)
+    {
+        switch(base)
+        {
+            case 'G':
+                G++;
+                break;
+            case 'g':
+                g++;
+                break;
+            case 'A':
+                A++;
+                break;
+            case 'a':
+                a++;
+                break;
+            case 'C':
+                C++;
+                break;
+            case 'c':
+                c++;
+                break;
+            case 'T':
+                T++;
+                break;
+            case 't':
+                t++;
+                break;
+            default:
+                std::cout << "Error; Invalid Base: " << base << "\n";
+        }
+    }
+
+    std::cout << "g: " << g << " a: " << a << " c: " << c << " t: " << t << "\n";
+    std::cout << "G: " << G << " A: " << A << " C: " << C << " T: " << T << "\n";
+    /*
+    d)
+    A switch should be used, when checking if a variable has one of many possible values.
+    */
+}
+
+void ab3()
+{
+    const long double from = 0.0;
+    const long double to = 1.0;
+    long double integral_val = 0.0;
+    long double x = from;
+    const size_t N = 1000000;
+    const long double step_width = std::abs(from - to) / static_cast<long double>(N);
+    for (size_t n = 0; n < N; ++n) {
+    //integral_val += 4 / (1 + x * x);
+    //a: integral_val += 3*x*x;
+    //b: integral_val += 2* std::sqrt(x);
+    x += step_width;
+    }
+    integral_val /= N;
+    std::cout << integral_val << '\n';
+}
+
+void c3()
+{
+    int sum = 0;
+    for(int k=1; k<=100; k++)
+    {
+        sum += k;
+    }
+    std::cout << sum << '\n';
+}
+
+void d3()
+{
+    int sum = 0;
+    for(int i=1; i<=10; i++)
+    {
+        for(int j=1; j<=10; j++)
+        {
+            sum += i;
+        }
+    }
+    std::cout << sum << '\n';
+}
+
+void abc4()
+{
+    for(int x=0; x<10; x++)
+    {
+        for(int y=0; y<10; y++)
+        {
+            std::cout << '#';
+        }
+        std::cout << '\n';
+    }
+    std::cout << '\n';
+
+    for(int x=0; x<10; x++)
+    {
+        for(int y=0; y<10; y++)
+        {
+            if(y==0 || y==9 || x==0 || x==9)
+            {
+                std::cout << '#';
+            }
+            else
+            {
+                std::cout << ' ';
+            }
+        }
+        std::cout << '\n';
+    }
+    std::cout << '\n';
+  
+    for(int x=0; x<10; x++)
+    {
+        for(int y=0; y<10; y++)
+        {
+            if(x==y || y==0 || y==9 || x==0 || x==9)
+            {
+                std::cout << '#';
+            }
+            else
+            {
+                std::cout << ' ';
+            }
+        }
+        std::cout << '\n';
+    }
+    std::cout << '\n';
+}
+
+int main()
+{
+    int selection;
+    std::cout << "1: 1a\n2: 1b\n3: 2abcd\n4: 3ab\n5: 3c\n6: 3d\n7: 4abc\n";
+    std::cout << "Please select an Exercise: ";
+    std::cin >> selection;
+
+    switch(selection)
+    {
+        case 1:
+            a1();
+            break;
+        case 2:
+            b1();
+            break;
+        case 3:
+            abcd2();
+            break;
+        case 4:
+            ab3();
+            break;
+        case 5:
+            c3();
+            break;
+        case 6:
+            d3();
+            break;
+        case 7:
+            abc4();
+            break;
+        default:
+            a1();
+            b1();
+            abcd2();
+            ab3();
+            c3();
+            d3();
+    }
+    return 0;
+}
\ No newline at end of file