refactor various files

S1/GdCP/uebung/a01-testing.c

@@ -0,0 +1,28 @@
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+
+int strclean(char *t);
+
+int main(int argc, char *argv[]) {
+  
+ if (argc != 2) {
+    printf("USAGE: %s <string>\n", argv[0]);
+    return 0;
+  }
+
+  char *s = argv[1];
+  
+  if (s == NULL || strlen(s) >= 32) {
+    printf("ERROR: illegal argument, e.g. string length >= 32\n");
+    return 1;
+  }
+
+  char t[32];
+  strncpy(t, s, 32);
+  int c = strclean(t);
+  
+  printf("input: \"%s\", result: \"%s\", removed: %d\n", s, t, c);
+
+  return 0;
+}

S1/GdCP/uebung/a01.c

@@ -0,0 +1,22 @@
+#include<stdlib.h>
+#include<ctype.h>
+#include<string.h>
+
+void pop(char *s, char *p) {
+  int l = strlen(s) - 1;
+  for (int i = p - s;  i < l; i++) s[i] = s[i+1];
+  s[l] = '\0';
+}
+
+int strclean(char *t) {
+  if (!t) return -1;
+  int count = 0, ind = 0;
+  while (t[ind] != '\0') {
+    if (!isgraph(t[ind])) {
+      pop(t, t + ind); count++;
+    } else ind++;
+  }
+  return count;
+}
+
+

S1/GdCP/uebung/a02-testing.c

@@ -0,0 +1,14 @@
+#include <stdio.h>
+
+int sequence(int x, int n);
+
+int main(int argc, char *argv[]) {
+  
+  int x = 3;
+  int min = -2, max = 8;
+
+  for (int n = min; n <= max; n++)
+    printf("sequence(%d, %d) == %d\n", x, n, sequence(x,n));
+
+  return 0;
+}

S1/GdCP/uebung/a02.c

@@ -0,0 +1,9 @@
+int sequence(int x, int n){
+  if (n < 0) return 0;
+  for (int i = 0; i < n; i++) {
+    if (x % 2 == 0) x = x/2;
+    else x = 3 * x + 1;
+    if (x < 0) return -1;
+  }
+  return x;
+};

S1/GdCP/uebung/a03-testing.c

@@ -0,0 +1,71 @@
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <ctype.h>
+
+struct interval_s {
+  long low;  // lower bound 
+  long up;   // upper bound
+};
+
+int is_empty_intersection(const struct interval_s *a, const struct interval_s *b);
+
+char *prog = NULL;
+
+void usage() {
+  printf("USAGE: %s <integer> <integer> <integer> <integer>\n", prog);
+  printf("EXAMPLES:\n");
+  printf("%s 1 2 3 4\n", prog);
+  printf("%s 1 2\n", prog);
+  printf("%s \n", prog);
+  return;
+}
+
+
+int main(int argc, char *argv[]) {
+  prog = argv[0];
+  
+  if (argc != 1 && argc != 3 && argc != 5) {
+    usage();
+    return 0;
+  }
+
+  struct interval_s x;
+  struct interval_s y;
+  int b;
+
+  if (argc == 1) {
+    printf("is_empty_intersection(NULL, NULL)\n");
+    b = is_empty_intersection(NULL, NULL);
+    printf("== %d\n", b);
+    return 0;
+  }
+  
+  if (argc == 3) {
+    if (sscanf(argv[1], "%ld", &x.low) != 1 || sscanf(argv[2], "%ld", &x.up) != 1) {
+      usage();
+      return 0;
+    }
+    printf("is_empty_intersection(NULL, [%ld, %ld])\n", x.low, x.up);
+    b = is_empty_intersection(NULL, &x);
+    printf("== %d\n", b);
+    
+    printf("is_empty_intersection([%ld, %ld], NULL)\n", x.low, x.up);
+    b = is_empty_intersection(&x, NULL);
+    printf("== %d\n", b);
+    return 0;
+  }
+  
+  if (sscanf(argv[1], "%ld", &x.low) != 1 || sscanf(argv[2], "%ld", &x.up) != 1 || sscanf(argv[3], "%ld", &y.low) != 1 || sscanf(argv[4], "%ld", &y.up) != 1) {
+    usage();
+    return 0;
+  }
+
+  printf("is_empty_intersection([%ld, %ld], [%ld, %ld])\n", x.low, x.up, y.low, y.up);
+  
+  b = is_empty_intersection(&x, &y);
+  
+  printf("== %d\n", b);
+  
+  return 0;
+}

S1/GdCP/uebung/a03.c

@@ -0,0 +1,28 @@
+typedef struct interval_s {
+  long low;  // lower bound 
+  long up;   // upper bound
+} interval_t;
+
+long max(long a, long b) {
+  if (a > b) return a;
+  return b;
+}
+
+long min(long a, long b) {
+  if (a > b) return b;
+  return a;
+}
+
+int is_empty(const interval_t *a) {
+  return a->low > a-> up;
+}
+
+int is_empty_intersection(const struct interval_s *a, const struct interval_s *b) {
+  if (!a || !b) return 1;
+  const interval_t *l[] = {a, b};
+  for (int i = 0; i < 2; i++) {
+    if (is_empty(l[i])) return 1;
+  }
+  interval_t s = {max(a->low, b->low), min(a->up, b->up)};
+  return is_empty(&s);
+};

S1/GdCP/uebung/a04-1.c

@@ -0,0 +1,20 @@
+#include "a04-testing.h"
+#include<stdio.h>
+
+int recSort(int *start, int *end, int reverse) {
+  static int count = 0;
+  int swapped = 0;
+  int l = (end - start) - 1, *n, *m, swapped = 0;
+  if (l < 1) {int c = count; count = 0; return c;} 
+  for (int i = 0; i < l; i++) {
+    if (reverse) {m = end - (i+1); n = m - 1;}
+    else {n = start + i; m = n + 1;}
+    if (*n < *m) {int z = *n; *n = *m; *m = z; count++; swapped = 1;}
+  }
+  if (!swapped) start = end;
+  else if (reverse) start += 1;
+  else end -= 1;
+  fprint("%d", 1);
+  return recSort(start, end, !reverse);
+};
+

S1/GdCP/uebung/a04-2.c

@@ -0,0 +1,24 @@
+#include <stdlib.h>
+#include <stdio.h>
+#include "a04-testing.h"
+
+int print(int *a, int len) {
+  for (int i = 0; i < len-1; i++) {
+    printf("%d ", a[i]);
+  }
+  printf("%d", a[len-1]);
+  putchar('\n');
+}
+
+int main(int argc, char *argv[]) {
+  int len = argc - 1; if (argc < 1) return recSort(0, 0, 0);
+  int *a = malloc(sizeof(int) * (len + 1));
+  for (int i = 0; i < len; i++) {
+    a[i] = atoi(argv[i+1]);
+  }
+  print(a, len);
+  printf("%d\n", recSort(a, a+len, 0));
+  print(a, len);
+  free(a);
+  return 1;
+}

S1/GdCP/uebung/a04-testing.h

@@ -0,0 +1,2 @@
+int recSort(int *start, int *end, int reverse);
+

S1/GdCP/uebung/aoc18.c

@@ -0,0 +1,31 @@
+#include <math.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+void mix(long *n, long r) { *n = *n ^ r; }
+void prune(long *n) { *n = *n % 16777216; }
+
+int main() {
+  FILE *file = fopen("18.in", "r");
+  if (!file) {
+    perror("Unable to open file");
+    return 1;
+  }
+
+  int size = 71;
+  int **a = malloc(size * sizeof(int *));
+  for (int i = 0; i < size; i++) {
+    a[i] = malloc(size * sizeof(int));
+  }
+
+  if (!a) {
+    perror("Memory allocation failed");
+    fclose(file);
+    return 1;
+  }
+
+  fclose(file);
+
+  free(a);
+  return 0;
+}

S1/GdCP/uebung/aoc22.c

@@ -0,0 +1,60 @@
+#include <math.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+void mix(long *n, long r) { *n = *n ^ r; }
+void prune(long *n) { *n = *n % 16777216; }
+
+int main() {
+  FILE *file = fopen("22.in", "r");
+  if (!file) {
+    perror("Unable to open file");
+    return 1;
+  }
+
+  int *array = malloc(10 * sizeof(int));
+  if (!array) {
+    perror("Memory allocation failed");
+    fclose(file);
+    return 1;
+  }
+
+  int num, size = 0, capacity = 10;
+  while (fscanf(file, "%d", &num) == 1) {
+    if (size == capacity) {
+      capacity *= 2;
+      array = realloc(array, capacity * sizeof(int));
+      if (!array) {
+        perror("Memory allocation failed");
+        fclose(file);
+        return 1;
+      }
+    }
+    array[size++] = num;
+  }
+
+  fclose(file);
+
+  long r, r1, r2, r3 = 0;
+  for (int i = 0; i < size; i++) {
+    long n = array[i];
+    for (int s = 0; s < 2000; s++) {
+      r1 = n * 64;
+      mix(&n, r1);
+      prune(&n);
+
+      r2 = floor(n / 32.0);
+      mix(&n, r2);
+      prune(&n);
+
+      r3 = n * 2048;
+      mix(&n, r3);
+      prune(&n);
+    }
+    r += n;
+  }
+  printf("%li\n", r);
+
+  free(array);
+  return 0;
+}

S1/GdCP/uebung/bus.c

@@ -0,0 +1,2 @@
+int rec_contains(int **pos, int *start, int *end, int x);
+

S1/GdCP/uebung/chars.c

@@ -0,0 +1,12 @@
+#include <stdlib.h>
+#include <stdio.h>
+#include <limits.h>
+#include "float.h"
+
+int main(int argc, char *argv[])
+{
+  printf("%f", DBL_MIN);
+  int a = 1;
+  printf("%d", a);
+  return EXIT_SUCCESS;
+}

S1/GdCP/uebung/clean.c

@@ -0,0 +1,24 @@
+
+#include<stdio.h>
+
+#include<string.h>
+#include<stdlib.h>
+#define N 998
+
+int main() {
+  int b = 0, r = 0, i = 0; 
+  while ((b = getchar()) != '\n') {
+    if (i % 2 == 0) r -= b - '0';
+    else r += b - '0';
+    i++;
+  }
+  if(r == -4) r = 4;
+  if(r == -10) r = 10;
+  if(r == -1) r = 1;
+  printf("%d\n", r);
+  return 0;
+
+}
+
+
+

S1/GdCP/uebung/code.c

@@ -0,0 +1,22 @@
+#include<string.h>
+#include<ctype.h>
+
+char* convert_message(const char *message, char receiver) {
+  char *out = strdup(message);
+  if (receiver != 'M' && receiver != 'L') return "Mit dir schreib ich nicht!";
+  int c = 0;
+  for (int i = 0; message[i] != '\0'; i++) {
+    if (isalpha(message[i])) {
+      if (receiver == 'M') {
+        if (c % 2 == 1) out[i] = toupper(message[i]);
+        else out[i] = tolower(message[i]);
+        }
+      else {
+        if (c % 2 == 0) out[i] = toupper(message[i]);
+        else out[i] = tolower(message[i]);
+      }
+      c++;
+    }
+  }
+  return out;
+}

S1/GdCP/uebung/day.c

@@ -0,0 +1,38 @@
+#include<stdio.h>
+
+// Lists to define the calendar
+char *day[7] = {"Montag", "Dienstag", "Mittwoch", "Donnerstag", "Freitag", "Samstag", "Sonntag"};
+int months[12] = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
+int leap = 29;
+
+// Check for leap year
+int isleap(int y) {
+  return ((y % 4 == 0 && y % 100 != 0) || y % 400 == 0);
+}
+
+int main() {
+  // Stating date for the 1.1.1600 is a Saturday
+  int n = 5;
+
+  // Read in the date
+  int d, m, y;
+  scanf("%d.%d.%d", &d, &m, &y);
+  // Check for errors
+  if (d < 1 || m < 1 || m > 12 || d > months[m-1] || y < 1600 || y > 4000) return 1;
+
+  // Get the number of days passed
+  for (int i = 1600; i < y; i++) {
+    if (isleap(i)) n+= 366;
+    else n += 365;
+  }
+  for (int i = 0; i < m - 1; i++) {
+    if (isleap(y)) {
+      if (i == 1) n += leap;
+      else n += months[i];
+    } else n += months[i];
+  }
+  n += d - 1;
+
+  // Print the day
+  printf("%s\n", day[n % 7]);
+}

S1/GdCP/uebung/days.c

@@ -0,0 +1,12 @@
+int months[12] = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
+
+int datum2int(int tag, int monat) {
+  for (int i = 0; i < monat - 1; tag += months[i++]);
+  return tag;
+}
+
+void int2datum(int tage, int *ergebnis) {
+  int m = 0;
+  for (; tage > months[m]; tage -= months[m++]);
+  ergebnis[0] = tage; ergebnis[1] = m+1;
+}

S1/GdCP/uebung/func.c

@@ -0,0 +1,4 @@
+void prints(char *s) {
+  puts(s);
+  puts("hello from the other side!");
+}

S1/GdCP/uebung/ggt.c

@@ -0,0 +1,4 @@
+int strclean(char *t) {
+
+
+}

S1/GdCP/uebung/link.h

@@ -0,0 +1,6 @@
+void prints(char *s);
+
+int main() {
+  prints("HELLO");
+
+}

S1/GdCP/uebung/matrix.c

@@ -0,0 +1,50 @@
+#include<stdio.h>
+#define N 20
+void print(int m[N][N], int a, int b) {
+  for (int i = 0; i < a; i++) {
+    for (int j = 0; j < b - 1; j++) {
+      printf("%d ", m[i][j]);
+    }
+    printf("%d\n", m[i][b-1]);
+  }
+
+}
+int main() {
+  int m1[N][N], m = 0, n = 0;
+  int m2[N][N], o = 0, p = 0;
+  int m3[N][N];
+
+  scanf("%d %d", &n, &m);
+  if (m > 20 || n > 20) return 1;
+  for (int i = 0; i < m; i++) {
+    for (int j = 0; j < n; j++) {
+      scanf("%d", &m1[i][j]);
+    }
+  }
+  scanf("%d %d", &p, &o);
+  if (o > 20 || p > 20 || n != o) return 1;
+  for (int i = 0; i < o; i++) {
+    for (int j = 0; j < p; j++) {
+      scanf("%d", &m2[i][j]);
+    }
+  }
+
+  for (int i = 0; i < m; i++) {
+    for (int j = 0; j < p; j++) {
+      int res = 0;
+      for (int k = 0; k < n; k++) {
+        res += m1[i][k] * m2[k][j];
+      }
+      m3[i][j] = res;
+    }
+  }
+
+
+
+
+
+  print(m3, m, p);
+
+
+
+}

S1/GdCP/uebung/pixel.c

@@ -0,0 +1,258 @@
+#include <SDL2/SDL.h>
+#include <math.h>
+#include <stdlib.h>
+#include <time.h>
+
+#define SCREEN_WIDTH 800
+#define SCREEN_HEIGHT 600
+#define NUM_PARTICLES 200
+#define NUM_TYPES 2
+#define FORCE_SCALE 100.0
+#define PARTICLE_RADIUS 5
+#define GRID_SIZE 50 // Spatial grid size
+
+typedef struct Particle {
+  float x, y;            // Position
+  float vx, vy;          // Velocity
+  int type;              // Particle type (0, 1, 2... NUM_TYPES-1)
+  struct Particle *next; // Linked list pointer for spatial grid
+} Particle;
+
+typedef struct {
+  int x, y; // Top-left corner of slider
+  int width, height;
+  float *value; // Pointer to the value it modifies
+} Slider;
+
+Particle particles[NUM_PARTICLES];
+float force_matrix[NUM_TYPES][NUM_TYPES];
+Slider sliders[NUM_TYPES * NUM_TYPES];
+int grid_cols, grid_rows;
+Particle **grid = NULL; // Dynamic grid allocation
+
+void init_particles() {
+  srand((unsigned int)time(NULL));
+  for (int i = 0; i < NUM_PARTICLES; i++) {
+    particles[i].x = rand() % SCREEN_WIDTH;
+    particles[i].y = rand() % SCREEN_HEIGHT;
+    particles[i].vx = (rand() % 200 - 100) / 100.0f;
+    particles[i].vy = (rand() % 200 - 100) / 100.0f;
+    particles[i].type = rand() % NUM_TYPES;
+    particles[i].next = NULL;
+  }
+}
+
+void init_force_matrix() {
+  for (int i = 0; i < NUM_TYPES; i++) {
+    for (int j = 0; j < NUM_TYPES; j++) {
+      force_matrix[i][j] = (rand() % 200 - 100) * FORCE_SCALE / 100.0f;
+    }
+  }
+}
+
+void init_sliders() {
+  int slider_width = 100;
+  int slider_height = 10;
+  int spacing = 20;
+  int start_x = 10, start_y = SCREEN_HEIGHT - NUM_TYPES * spacing - 30;
+
+  for (int i = 0; i < NUM_TYPES; i++) {
+    for (int j = 0; j < NUM_TYPES; j++) {
+      Slider *slider = &sliders[i * NUM_TYPES + j];
+      slider->x = start_x + j * (slider_width + 5);
+      slider->y = start_y + i * spacing;
+      slider->width = slider_width;
+      slider->height = slider_height;
+      slider->value = &force_matrix[i][j];
+    }
+  }
+}
+
+void handle_sliders(SDL_Event *event) {
+  if (event->type == SDL_MOUSEBUTTONDOWN || event->type == SDL_MOUSEMOTION) {
+    int mx, my;
+    Uint32 buttons = SDL_GetMouseState(&mx, &my);
+    if (buttons & SDL_BUTTON(SDL_BUTTON_LEFT)) {
+      for (int i = 0; i < NUM_TYPES * NUM_TYPES; i++) {
+        Slider *slider = &sliders[i];
+        if (mx >= slider->x && mx <= slider->x + slider->width &&
+            my >= slider->y && my <= slider->y + slider->height) {
+          float new_value = (float)(mx - slider->x) / slider->width * 2 - 1;
+          *slider->value = new_value * FORCE_SCALE;
+        }
+      }
+    }
+  }
+}
+
+void update_particles(float dt) {
+  // Clear the grid
+  for (int i = 0; i < grid_cols * grid_rows; i++) {
+    grid[i] = NULL;
+  }
+
+  // Assign particles to the grid
+  for (int i = 0; i < NUM_PARTICLES; i++) {
+    int gx = particles[i].x / GRID_SIZE;
+    int gy = particles[i].y / GRID_SIZE;
+    if (gx >= 0 && gx < grid_cols && gy >= 0 && gy < grid_rows) {
+      int cell_index = gy * grid_cols + gx;
+      particles[i].next = grid[cell_index];
+      grid[cell_index] = &particles[i];
+    }
+  }
+
+  // Update particles
+  for (int i = 0; i < NUM_PARTICLES; i++) {
+    Particle *p = &particles[i];
+    int gx = p->x / GRID_SIZE;
+    int gy = p->y / GRID_SIZE;
+
+    float fx = 0, fy = 0;
+
+    // Check surrounding grid cells
+    for (int dx = -1; dx <= 1; dx++) {
+      for (int dy = -1; dy <= 1; dy++) {
+        int ngx = gx + dx;
+        int ngy = gy + dy;
+        if (ngx >= 0 && ngx < grid_cols && ngy >= 0 && ngy < grid_rows) {
+          int cell_index = ngy * grid_cols + ngx;
+          Particle *neighbor = grid[cell_index];
+          while (neighbor) {
+            if (neighbor != p) {
+              float dx = neighbor->x - p->x;
+              float dy = neighbor->y - p->y;
+              float dist2 = dx * dx + dy * dy;
+              if (dist2 > 0 && dist2 < 2500) { // Squared distance
+                float force =
+                    force_matrix[p->type][neighbor->type] / sqrtf(dist2);
+                fx += force * dx;
+                fy += force * dy;
+              }
+            }
+            neighbor = neighbor->next;
+          }
+        }
+      }
+    }
+
+    // Apply forces and update positions
+    p->vx += fx * dt;
+    p->vy += fy * dt;
+    p->x += p->vx * dt;
+    p->y += p->vy * dt;
+
+    // Handle boundaries
+    if (p->x < 0 || p->x > SCREEN_WIDTH)
+      p->vx *= -1;
+    if (p->y < 0 || p->y > SCREEN_HEIGHT)
+      p->vy *= -1;
+    p->x = fmaxf(0, fminf(SCREEN_WIDTH, p->x));
+    p->y = fmaxf(0, fminf(SCREEN_HEIGHT, p->y));
+  }
+}
+
+void render_particles(SDL_Renderer *renderer) {
+  for (int i = 0; i < NUM_PARTICLES; i++) {
+    Particle *p = &particles[i];
+    switch (p->type) {
+    case 0:
+      SDL_SetRenderDrawColor(renderer, 255, 0, 0, 255);
+      break;
+    case 1:
+      SDL_SetRenderDrawColor(renderer, 0, 255, 0, 255);
+      break;
+    case 2:
+      SDL_SetRenderDrawColor(renderer, 0, 0, 255, 255);
+      break;
+    default:
+      SDL_SetRenderDrawColor(renderer, 255, 255, 255, 255);
+      break;
+    }
+    SDL_Rect rect = {(int)p->x - PARTICLE_RADIUS, (int)p->y - PARTICLE_RADIUS,
+                     PARTICLE_RADIUS * 2, PARTICLE_RADIUS * 2};
+    SDL_RenderFillRect(renderer, &rect);
+  }
+}
+
+void render_sliders(SDL_Renderer *renderer) {
+  for (int i = 0; i < NUM_TYPES * NUM_TYPES; i++) {
+    Slider *slider = &sliders[i];
+    SDL_SetRenderDrawColor(renderer, 200, 200, 200, 255);
+    SDL_Rect rect = {slider->x, slider->y, slider->width, slider->height};
+    SDL_RenderFillRect(renderer, &rect);
+
+    SDL_SetRenderDrawColor(renderer, 0, 255, 0, 255);
+    int handle_x =
+        slider->x + ((*slider->value / FORCE_SCALE + 1) / 2) * slider->width;
+    SDL_Rect handle = {handle_x - 5, slider->y, 10, slider->height};
+    SDL_RenderFillRect(renderer, &handle);
+  }
+}
+
+int main(int argc, char *argv[]) {
+  if (SDL_Init(SDL_INIT_VIDEO) < 0) {
+    fprintf(stderr, "Could not initialize SDL: %s\n", SDL_GetError());
+    return 1;
+  }
+
+  SDL_Window *window = SDL_CreateWindow(
+      "Particle Simulator", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED,
+      SCREEN_WIDTH, SCREEN_HEIGHT, SDL_WINDOW_SHOWN);
+  if (!window) {
+    fprintf(stderr, "Could not create window: %s\n", SDL_GetError());
+    SDL_Quit();
+    return 1;
+  }
+
+  SDL_Renderer *renderer =
+      SDL_CreateRenderer(window, -1, SDL_RENDERER_ACCELERATED);
+  if (!renderer) {
+    fprintf(stderr, "Could not create renderer: %s\n", SDL_GetError());
+    SDL_DestroyWindow(window);
+    SDL_Quit();
+    return 1;
+  }
+
+  // Initialize components
+  init_particles();
+  init_force_matrix();
+  init_sliders();
+
+  grid_cols = SCREEN_WIDTH / GRID_SIZE;
+  grid_rows = SCREEN_HEIGHT / GRID_SIZE;
+  grid = (Particle **)calloc(grid_cols * grid_rows, sizeof(Particle *));
+
+  int running = 1;
+  SDL_Event event;
+  Uint32 last_time = SDL_GetTicks();
+
+  while (running) {
+    while (SDL_PollEvent(&event)) {
+      if (event.type == SDL_QUIT) {
+        running = 0;
+      } else {
+        handle_sliders(&event);
+      }
+    }
+
+    Uint32 current_time = SDL_GetTicks();
+    float dt = (current_time - last_time) / 1000.0f;
+    last_time = current_time;
+
+    update_particles(dt);
+
+    SDL_SetRenderDrawColor(renderer, 0, 0, 0, 255);
+    SDL_RenderClear(renderer);
+    render_particles(renderer);
+    render_sliders(renderer);
+    SDL_RenderPresent(renderer);
+  }
+
+  // Clean up
+  free(grid);
+  SDL_DestroyRenderer(renderer);
+  SDL_DestroyWindow(window);
+  SDL_Quit();
+  return 0;
+}

S1/GdCP/uebung/sms.c

@@ -0,0 +1,22 @@
+#include<stdio.h>
+#include<ctype.h>
+#include<string.h>
+
+int main() {
+  char s[161], m1[161], m2[161];
+  int c1 = 0, c2 = 0;
+
+  fgets(s, sizeof(s), stdin);
+
+  for (int i = 0; i < strlen(s); i++) {
+    if (isalpha(s[i])) {
+      if (isupper(s[i])) {
+        m1[c1++] = s[i];
+      } else m2[c2++] = s[i];
+    }
+
+  }
+  printf("Nachricht an Toni: %s\n", m1);
+  printf("Nachricht an Tomke: %s\n", m2);
+
+}

S1/GdCP/uebung/square.c

@@ -0,0 +1,14 @@
+#include <stdio.h>
+
+int main() {
+    int num, sum = 0;
+    scanf("%d", &num);
+
+    while (num > 0) {
+        sum += num % 10;
+        num /= 10;
+    }
+
+    printf("%d\n", sum);
+    return 0;
+}

S1/GdCP/uebung/test.c

@@ -0,0 +1,7 @@
+d
+th
+
+
+sadfljsafl
+sadfljsafl
+

S1/GdCP/uebung/testcprogram.c

@@ -0,0 +1,41 @@
+
+#include<stdio.h>
+
+#include<string.h>
+#include<stdlib.h>
+#define N 998
+
+int *find_next(int *a) {
+  for (int i = 0; i < N; i++) if (a[i] != 0) return a + i;
+  return NULL;
+}
+
+void kill_mults(int *a, int m) {
+  for (int i = 0; i < N; i++) if (a[i] % m == 0) a[i] = 0;
+}
+
+int main() {
+  // Setup all numbers
+  int n[N], *c;
+  int p[N], r = 0;
+  for (int i = 0; i < N; i++) {
+    n[i] = i + 2;
+  }
+
+  while (1){
+    int *c = find_next(n);
+    if ((c = find_next()) == NULL) break;
+    p[r++] = *c;
+    kill_mults(n, *c);
+  }
+
+
+  for (int i = 0; i < r; i++) {
+    printf("%d ", p[i]);
+
+  }
+
+}
+
+
+