diff --git a/C8/ex2.c b/C8/ex2.c
new file mode 100644
index 0000000..c1dd316
--- /dev/null
+++ b/C8/ex2.c
@@ -0,0 +1,14 @@
+#include <stdio.h>
+
+int main() {
+	int input;
+
+	printf("Enter an integer: ");
+	scanf("%d", &input);
+
+	if (input >= 0 && input <= 10) {
+		printf("The number is in range\n");
+	}
+
+	return 0;
+}
diff --git a/C8/ex3.c b/C8/ex3.c
new file mode 100644
index 0000000..9a2d714
--- /dev/null
+++ b/C8/ex3.c
@@ -0,0 +1,14 @@
+#include <stdio.h>
+
+int main() {
+	int input;
+
+	printf("Enter an integer: ");
+	scanf("%d", &input);
+
+	if (!(input >= 0 && input <= 10)) {
+		printf("The number is not in range\n");
+	}
+
+	return 0;
+}
diff --git a/C8/ex4.c b/C8/ex4.c
new file mode 100644
index 0000000..1878661
--- /dev/null
+++ b/C8/ex4.c
@@ -0,0 +1,21 @@
+#include <stdio.h>
+
+int main() {
+	int age;
+
+	printf("Enter your age: ");
+	scanf("%d", &age);
+
+	// c only matches one branch so don't need to specify lower limits of each age range
+	if ( age <= 0 ) {
+		printf("Still a baby\n");
+	} else if ( age <= 12 ) {
+		printf("The junior years\n");
+	} else if ( age < 20 ) {
+		printf("Teenage years\n");
+	} else {
+		printf("Downhill all the way now!\n");
+	}
+
+	return 0;
+}
diff --git a/C8/ex7.c b/C8/ex7.c
new file mode 100644
index 0000000..53cc081
--- /dev/null
+++ b/C8/ex7.c
@@ -0,0 +1,25 @@
+#include <stdio.h>
+#include <math.h>
+
+int main() {
+	int rc; // used to check return codes of scanf
+	float radius, height;
+
+	printf("Enter radius: ");
+	rc = scanf("%f", &radius);
+	// scanf returns number of scanned items
+	if (rc != 1) {
+		printf("Please enter an positive real integer or decimal\n");
+		return 1;
+	}
+
+	printf("Enter height: ");
+	rc = scanf("%f", &height);
+	// scanf returns number of scanned items
+	if (rc != 1) {
+		printf("Please enter an positive real integer or decimal\n");
+		return 1;
+	}
+
+	printf("Surface area: %f\n", 2*M_PI*radius*radius + 2*M_PI*radius*height);
+}
diff --git a/C8/if_example.c b/C8/if_example.c
index d41d7a5..83939d0 100644
--- a/C8/if_example.c
+++ b/C8/if_example.c
@@ -3,20 +3,25 @@
 
 int main(void)
 {
-    // Declare some variables
-    int  a = 7, b=6;
+	// Declare some variables
+	int  a = 7, b=6;
+
+	printf("Enter a value for a: ");
+	scanf("%d", &a);
+	printf("Enter a value for b: ");
+	scanf("%d", &b);
 
 	// A single line of code conditional on the value of a
 	if ( a == 7 )
-	   printf ("The value of a is 7 - so I will do this\n");    
+	   printf ("The value of a is 7 - so I will do this\n");
 	   
 	// Multiple lines of code conditional on b not equalling 4
 	// so then need to be placed inside { and }
 	if ( b != 4 )
 	{
-	   printf ("The value of b is not 4\n");    
-	   printf ("So I will do multiple tasks\n");    
+	   printf ("The value of b is not 4\n");
+	   printf ("So I will do multiple tasks\n");
 	}
 	   
-    return 0;   // Exit from main
-}
\ No newline at end of file
+	return 0;   // Exit from main
+}