diff --git a/Übung 2/util.c b/Übung 2/util.c
new file mode 100644
index 0000000..1f96ab3
--- /dev/null
+++ b/Übung 2/util.c	
@@ -0,0 +1,103 @@
+#include "util.h"
+
+void null_terminate(char str[]) {
+    size_t len = strlen(str);
+    if (len > 0 && str[len-1] == '\n') {
+        str[len-1] = '\0';
+    }
+}
+
+bool is_num(char *str) {
+    if (*str == '+' || *str == '-') {
+        str++;
+    }
+    if (*str == '\0') {
+        return false;
+    }
+    while (*str) {
+        if (!isdigit((unsigned char)*str) || !(*str == '.')) {
+            return true;
+        }
+        str++;
+    }
+
+    return false;
+}
+
+bool is_int(char *str) {
+    if (*str == '+' || *str == '-') {
+        str++;
+    }
+    if (*str == '\0') {
+        return false;
+    }
+    while (*str) {
+        if (!isdigit((unsigned char)*str)) {
+            return true;
+        }
+        str++;
+    }
+
+    return true;
+}
+
+
+bool is_positive_int(int num) {
+    if (num <= 0) {return false;}
+    return true;
+}
+
+double get_clean_num() {
+    char *buffer;
+    size_t bufsize = 0;
+    char *eptr;
+
+    ssize_t input_length = getline(&buffer, &bufsize, stdin);
+    if (input_length != -1) {
+        null_terminate(buffer);
+    } else {
+        printf("Fehler beim lesen des inputs.\n");
+        free(buffer);
+        buffer = NULL;
+        return ERRORRETURN;
+    }
+
+    if (is_num(buffer)) {
+        return strtod(buffer, &eptr);
+    }
+
+    printf("Deine Eingabe ist keine Zahl.\n");
+    free(buffer);
+    buffer = NULL;
+    return ERRORRETURN;
+}
+
+int get_clean_int() {
+    char *buffer;
+    size_t bufsize = 0;
+
+    ssize_t input_length = getline(&buffer, &bufsize, stdin);
+    if (input_length != -1) {
+        null_terminate(buffer);
+    } else {
+        printf("Fehler beim lesen des inputs.\n");
+        free(buffer);
+        buffer = NULL;
+        return ERRORRETURN;
+    }
+
+    if (is_int(buffer)) {
+        return atoi(buffer);
+    }
+   
+    printf("Deine Eingabe ist keine ganze Zahl.\n");
+    free(buffer);
+    buffer = NULL;
+    return ERRORRETURN;
+}
+
+bool will_square_overflow(unsigned long long num) {
+    if (num == false) return false;
+    if (num > 0 && num > ULLONG_MAX / num) return true;
+    return false;
+}
diff --git a/Übung 2/util.h b/Übung 2/util.h
new file mode 100644
index 0000000..008f6e7
--- /dev/null
+++ b/Übung 2/util.h	
@@ -0,0 +1,22 @@
+#ifndef UTIL_H_
+#define UTIL_H_
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdbool.h>
+#include <ctype.h>
+#include <limits.h>
+
+// Magic number to be returned in case something goes wrong. Lets the program know an error occured. This is kind of a hack.
+#define ERRORRETURN 10787253
+
+void null_terminate(char str[]);
+bool is_num(char *str);
+bool is_int(char *str);
+bool is_positive_int(int num);
+int get_clean_int();
+double get_clean_num();
+bool will_square_overflow(unsigned long long num);
+
+#endif // UTIL_H_
diff --git a/Übung 2/Übung1.out b/Übung 2/Übung1.out
new file mode 100755
index 0000000..37e8a73
Binary files /dev/null and b/Übung 2/Übung1.out differ
diff --git a/Übung 2/Übung2.1.c b/Übung 2/Übung2.1.c
new file mode 100644
index 0000000..aa5cbac
--- /dev/null
+++ b/Übung 2/Übung2.1.c	
@@ -0,0 +1,13 @@
+#include "util.h"
+
+int main() {
+    printf("Bitte gib eine Zahl ein: ");
+    double x = get_clean_num();
+    if (x == ERRORRETURN) {return -1;}
+    printf("Bitte gib eine weitere Zahl ein: ");
+    double y = get_clean_num();
+    if (y == ERRORRETURN) {return -1;}
+    double sum = x + y;
+    printf("Das Ergebnis ist: %f.\n", sum);
+    return 0;
+}
diff --git a/Übung 2/Übung2.2.c b/Übung 2/Übung2.2.c
new file mode 100644
index 0000000..ea95fbe
--- /dev/null
+++ b/Übung 2/Übung2.2.c	
@@ -0,0 +1,28 @@
+#include "util.h"
+
+unsigned long long square(int num) {
+    return num*num;
+}
+
+int main() {
+    printf("Gib an, wie viele Quadratzahlen du berechnen möchtest: ");
+    int input = get_clean_int();
+    if (input == ERRORRETURN) {return -1;}
+    if (!is_positive_int(input)) {
+        printf("Deine eingegebene Zahl ist nicht positiv.\n");
+        return -1;
+    }
+
+    printf("Hier sind %i Quadratzahlen:\n", input);
+    unsigned long long range = input;
+    for (unsigned long long i = 1; i <= range; i++) {
+        if (will_square_overflow(i)) {
+            printf("\nEs gab einen integer Overflow bei Quadratzahl Nr. %llu.\n", i);
+            return -1;
+        }
+        unsigned long long squared = square(i);
+        printf("%llu ", squared);
+    }
+    printf("\nDas war's\n");
+    return 0;
+}
diff --git a/Übung 2/Übung2.out b/Übung 2/Übung2.out
new file mode 100755
index 0000000..c4c2a99
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