refactor various files

S1/GdCP/klausur_uebung/brueche.c

@@ -0,0 +1,85 @@
+#include<stdlib.h>
+#include<stdio.h>
+#include<time.h>
+
+// This is the definition for a fraction from the task
+typedef struct {
+  int n;
+  int d;
+} fraction_t;
+
+fraction_t sub_frac(fraction_t *a, fraction_t *b) {
+  // this function should substract fractions from anonther
+  // with the condition that a/b - c/d = (ad + bc)/(bd)
+  // also check that the negative sign always is on the nominator
+
+  fraction_t r = {0};
+
+  // Check for edge cases
+  if (!a || !b || a->d == 0 || b->d == 0) return r;
+
+
+  // Calculate the result
+  r.n = a->n * b->d - a->d * b->n;
+  r.d = a->d * b->d;
+
+  // flip the signs
+  if (r.d < 0) {
+    r.d *= -1; r.n *= -1;
+  }
+  
+  return r;
+}
+
+fraction_t *max_frac(fraction_t a[], int l) {
+  // This function should return a pointer to the biggest fraction in the array
+  // Do this with the condition that if a - b < 0 it follows that a < b.
+
+  // Init the max
+  fraction_t *m = a;
+
+  // Find the max
+  for (int i = 1; i < l; i++) {
+    if (sub_frac(m, a + i).n < 0) {
+      m = a + i;
+    }
+  }
+
+  return m;
+}
+
+#define N 10
+
+void print_frac(fraction_t *f) {
+  printf("%d/%d ", f->n, f->d);
+}
+
+int main() {
+  // Seed the randomness
+  srand(time(NULL));
+
+  // Generate a list of random fractions
+  fraction_t l[N];
+  for (int i = 0; i < N; i++) {
+    fraction_t r = {rand()%5+1, rand()%5+1};
+
+    // Also give a random sign
+    if (rand()%2 == 0) {
+      r.n *= -1;
+    }
+    l[i] = r;
+  }
+
+  // print the fracions
+  for (int i = 0; i < N; i++) {
+    print_frac(l +i);
+  }
+  putchar('\n');
+
+  // Print the max Fraction
+  fraction_t *max = max_frac(l, N);
+  printf("The max fraction is: ");
+  print_frac(max);
+  putchar('\n');
+}
+