move exercises and lectures into subfolders

Exercises/C9/do_while_loop.c

@@ -0,0 +1,24 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+int main(void)
+{
+	int age;		// Declare variable, no need to initialise this time 
+					// as we read into it before it is tested against
+    
+    // The loop is always entered as the test is at the end
+    do 
+    {
+        // Code must be executed at least once
+        printf ("\nPlease enter your age");
+        scanf("%d", &age);
+        printf ("You are %d years old\n", age);    
+        
+        // Test is now made and the code 
+        // repeats if the test equates as non-zerp
+        // (i.e. is age is not zero)
+    }
+    while ( age != 0);
+    
+    return 0;
+}

Exercises/C9/ex2.c

@@ -0,0 +1,23 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+int main(void)
+{
+   	int age = 1;  			// Declare variable and initialise to 1
+    
+    while ( age != 0)	    // Loop as long as age is not zero
+    {
+        // Code in {} executed if condition is true (non-zero)
+        
+        printf ("\nPlease enter your age: ");
+        scanf("%d", &age);
+        printf ("You are %d years old\n", age);
+
+	if (age == 18 || age == 21) {
+		printf("You have come of age\n");
+	}
+        
+        // Code  now goes back and repeats the test with the value of age just entered
+    }
+    return 0;	// Exit code
+}

Exercises/C9/ex3.c

@@ -0,0 +1,14 @@
+#include <stdio.h>
+
+#define MAX_NAME_LEN 200
+
+int main() {
+	char name[MAX_NAME_LEN] = { 0 };
+
+	printf("Please enter your name: ");
+	scanf("%s", name);
+
+	while (1) {
+		printf("%s\n", name);
+	}
+}

Exercises/C9/ex4.c

@@ -0,0 +1,21 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+int main(void)
+{
+	int age = 1; // Declare variable and initialise to 1
+
+	do {
+
+	printf ("\nPlease enter your age: ");
+	scanf("%d", &age);
+	printf ("You are %d years old\n", age);
+
+	if (age == 18 || age == 21) {
+		printf("You have come of age\n");
+	}
+
+	// Code  now goes back and repeats the test with the value of age just entered
+	} while ( age != 0); // Loop as long as age is not zero
+	return 0; // Exit code
+}

Exercises/C9/ex5.c

@@ -0,0 +1,9 @@
+#include <stdio.h>
+
+int main() {
+	for (int i = 1; i <= 15; i++) {
+		printf("%d\n", i);
+	}
+
+	return 0;
+}

Exercises/C9/ex6.c

@@ -0,0 +1,29 @@
+#include <stdio.h>
+
+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\n", i);
+	}
+
+	return 0;
+}

Exercises/C9/ex7.c

@@ -0,0 +1,29 @@
+#include <stdio.h>
+
+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 %d\n", i, i*i);
+	}
+
+	return 0;
+}

Exercises/C9/ex8.c

@@ -0,0 +1,32 @@
+#include <stdio.h>
+
+int main() {
+	int rc, start, end, sum = 0;
+
+	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\n", i);
+		sum += i;
+	}
+
+	printf("Sum: %d\n", sum);
+
+	return 0;
+}

Exercises/C9/for_loop_examples.c

@@ -0,0 +1,31 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+int main(void)
+{
+    // Ddeclare variable and initialise to 1
+    int i;
+
+    // Count up from 1 to 100 in steps of 1
+    // Note the test could also be: i <= 100
+    for ( i = 0 ; i < 101 ; i++ )
+    {
+        printf ("The value of i is %d\n",i);
+    }
+
+    // Count down form 10 to zero
+    // Note: we could also use the test: i != 0
+    for ( i = 10 ; i >= 0 ; i-- )
+    {
+        printf ("The value of i is %d\n",i);
+    }
+
+    // Count up from 1 to 100 in steps of 3
+    // Note the test could also be: i <= 100
+    // Increement could also be written as i+=3
+    for ( i = 0 ; i < 101 ; i=i+1 )
+    {
+        printf ("The value of i is %d\n",i);
+    }
+    return 0;
+}

Exercises/C9/infinite_while_loop.c

@@ -0,0 +1,23 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+int main(void)
+{
+	int age ;  	// Declare variable, no need to initialise this time 
+				// as the test condition is not based on its value
+    
+    // This is always non-zero, the loop will never break
+    while ( 1 )
+    {
+        // Code in {} executed if condition is true (non-zero)
+        
+        printf ("\nPlease enter your age");
+        scanf("%d", &age);
+        printf ("You are %d years old\n", age);    
+        
+        // Code  now goes back and repeats 
+        // as the conditions is always non-zero (true)
+    }
+    
+    return 0;	// Exit code
+}

Exercises/C9/while_loop.c

@@ -0,0 +1,19 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+int main(void)
+{
+   	int age = 1;  			// Declare variable and initialise to 1
+    
+    while ( age != 0)	    // Loop as long as age is not zero
+    {
+        // Code in {} executed if condition is true (non-zero)
+        
+        printf ("\nPlease enter your age");
+        scanf("%d", &age);
+        printf ("You are %d years old\n", age);    
+        
+        // Code  now goes back and repeats the test with the value of age just entered
+    }
+    return 0;	// Exit code
+}