move exercises, lecture examples, labs into subfolders

Exercises/C14/ex1.c

@@ -0,0 +1,32 @@
+#include <stdio.h>
+#include <math.h>
+
+void cartesian_to_polar(float x, float y, float *r, float *theta) {
+	*r = sqrtf(x*x + y*y);
+	*theta = y/x;
+}
+
+int main() {
+	int rc;
+	float x, y, r, theta;
+
+	printf("x: ");
+	rc = scanf("%f", &x);
+	// check that scanf was successful by checking if it returned 1 (1 successfully scanned item)
+	if (rc != 1) {
+		printf("Please enter a real number\n");
+		return 1;
+	}
+
+	printf("y: ");
+	rc = scanf("%f", &y);
+	if (rc != 1) {
+		printf("Please enter a real number\n");
+		return 1;
+	}
+
+	cartesian_to_polar(x, y, &r, &theta);
+	printf("r=%f theta=%f\n", r, theta);
+
+	return 0;
+}