move exercises and lectures into subfolders

Exercises/C10/ex2.c

@@ -0,0 +1,19 @@
+#include <stdio.h>
+#include <math.h>
+
+
+float degrees_to_radians(float degrees) {
+	return M_PI * degrees / 180.0;
+}
+
+int main() {
+	float input, output;
+	printf("Enter an angle in degrees: ");
+	scanf("%f", &input);
+
+	output = degrees_to_radians(input);
+
+	printf("%f radians\n", output);
+
+	return 0;
+}

Exercises/C10/ex3.c

@@ -0,0 +1,36 @@
+#include <stdio.h>
+#include <math.h>
+
+
+float degrees_to_radians(float degrees) {
+	return M_PI * degrees / 180.0;
+}
+
+
+int main() {
+	int rc, start, end;
+
+	printf("Start: ");
+	rc = scanf("%d", &start);
+	if (rc != 1) {
+		printf("Please enter a real integer\n");
+		return 1;
+	}
+	printf("End: ");
+	rc = scanf("%d", &end);
+	if (rc != 1) {
+		printf("Please enter a real integer\n");
+		return 1;
+	}
+
+	if (start > end) {
+		printf("Please ensure that start value is smaller than end value\n");
+		return 1;
+	}
+
+	for (int i = start; i <= end; i++) {
+		printf("%d %f\n", i, degrees_to_radians((float)i));
+	}
+
+	return 0;
+}

Exercises/C10/ex4.c

@@ -0,0 +1,42 @@
+#include <stdio.h>
+
+int date_to_day(int year, int month, int day) {
+	if (month < 3) {
+		month += 12;
+		year -= 1;
+	}
+
+	return ((13*month+3)/5 + day + year + year/4 - year/100 + year/400) % 7;
+}
+
+int main() {
+	int rc, year, month, day, nd;
+
+	printf("Enter a day (yyyy-mm-dd): ");
+	rc = scanf("%d-%d-%d", &year, &month, &day);
+	if (rc != 3) {
+		printf("Failed to parse date\n");
+		return 1;
+	}
+
+	nd = date_to_day(year, month, day);
+
+	switch (nd) {
+		case 0:
+			printf("Monday\n"); break;
+		case 1:
+			printf("Tuesday\n"); break;
+		case 2:
+			printf("Wednesday\n"); break;
+		case 3:
+			printf("Thursday\n"); break;
+		case 4:
+			printf("Friday\n"); break;
+		case 5:
+			printf("Saturday\n"); break;
+		case 6:
+			printf("Sunday\n"); break;
+	}
+
+	return 0;
+}

Exercises/C10/ex5.c

@@ -0,0 +1,45 @@
+#include <stdio.h>
+
+int date_to_day(int year, int month, int day) {
+	if (month < 3) {
+		month += 12;
+		year -= 1;
+	}
+
+	return ((13*month+3)/5 + day + year + year/4 - year/100 + year/400) % 7;
+}
+
+void print_day_of_week(int day) {
+	switch (day) {
+		case 0:
+			printf("Monday\n"); break;
+		case 1:
+			printf("Tuesday\n"); break;
+		case 2:
+			printf("Wednesday\n"); break;
+		case 3:
+			printf("Thursday\n"); break;
+		case 4:
+			printf("Friday\n"); break;
+		case 5:
+			printf("Saturday\n"); break;
+		case 6:
+			printf("Sunday\n"); break;
+	}
+}
+
+int main() {
+	int rc, year, month, day, nd;
+
+	printf("Enter a day (yyyy-mm-dd): ");
+	rc = scanf("%d-%d-%d", &year, &month, &day);
+	if (rc != 3) {
+		printf("Failed to parse date\n");
+		return 1;
+	}
+
+	nd = date_to_day(year, month, day);
+	print_day_of_week(nd);
+
+	return 0;
+}

Exercises/C10/function_example.c

@@ -0,0 +1,43 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <math.h>
+
+// Define HOW the function is to be used, code comes later
+float CalculateSurfaceAreaOfCylinder ( float R, float L );
+
+// Function to calculate the volume of a cylinder
+float CalculateVolumneOfCylinder ( float R, float L )
+{
+	// Calculate  \& return value
+	float Result;
+	Result = (M_PI * R * R * L);
+	return (Result);
+}
+int main(void)
+{
+    // Declare variables
+    float r, l, SurfaceArea, Volume;
+
+    // Obtain values
+    printf("\nPlease enter the radius");
+    scanf("%f", &r);
+
+    printf("\nPlease enter the length");
+    scanf("%f", &l);
+
+    // Get and display the volume
+    Volume = CalculateVolumneOfCylinder(r, l);
+    printf ("\nThe volume is %f", Volume);
+
+    // Get and display the surface area
+    SurfaceArea = CalculateSurfaceAreaOfCylinder(r, l);
+    printf ("\nThe surface area is %f", SurfaceArea);
+
+    return 0;
+}
+// Calculate the surface areas of a cylinder
+float CalculateSurfaceAreaOfCylinder ( float R, float L )
+{
+	// Calculate  \& return value
+	return (2 * M_PI * R * R ) +  ( 2 * M_PI * R * L);
+}

Exercises/C10/void_function_example.c

@@ -0,0 +1,38 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+// Define HOW the function is to be used, code comes later
+void DisplayDayOfTheWeek ( int Day );
+
+int main(void)		// Execution starts here
+{
+   	int d;	// Declare variable
+
+    // Obtain values
+    printf("\nPlease enter a number betwwen 0 and 6");
+    scanf("%d", &d);
+
+    // Use a function to display the day of the week
+    DisplayDayOfTheWeek(d);
+
+    return 0;
+}
+
+// Function to display day of week - nothing is returned
+void DisplayDayOfTheWeek ( int Day )
+{
+    // Display date based on value
+    // Case values on one line as easier to cut/paste :-)    
+    switch (Day)
+    {
+			case 0 : printf ("Sunday") ; break;
+			case 1 : printf ("Monday") ; break;
+			case 2 : printf ("Tuesday") ; break;
+         
+		    /* etc. for other days of the week */    
+    
+    	default:
+        	printf ("Invaid day provided");
+    }
+    return;	// No value needed as the return type is void
+}