diff --git a/C7/ex3.c b/C7/ex3.c
new file mode 100644
index 0000000..7d6b3bf
--- /dev/null
+++ b/C7/ex3.c
@@ -0,0 +1,13 @@
+#include <stdio.h>
+#include <math.h>
+
+int main() {
+	float radius, height;
+
+	printf("Enter radius: ");
+	scanf("%f", &radius);
+	printf("Enter height: ");
+	scanf("%f", &height);
+
+	printf("Surface area: %f\n", 2*M_PI*radius*radius + 2*M_PI*radius*height);
+}
diff --git a/C7/ex4.c b/C7/ex4.c
new file mode 100644
index 0000000..92bbf40
--- /dev/null
+++ b/C7/ex4.c
@@ -0,0 +1,11 @@
+#include <stdio.h>
+
+int main() {
+	char name[200] = { 0 };
+
+	printf("What is your name? ");
+	scanf("%s", name);
+
+	printf("Hello %s\n", name);
+
+}
diff --git a/C7/ex5.c b/C7/ex5.c
new file mode 100644
index 0000000..f828e8d
--- /dev/null
+++ b/C7/ex5.c
@@ -0,0 +1,15 @@
+#include <stdio.h>
+
+int main() {
+	char name[200] = { 0 };
+	int age = 0;
+
+	printf("What is your name? ");
+	scanf("%s", name);
+
+	printf("What is your age? ");
+	scanf("%ud", &age);
+
+	printf("Hello %s\nYou are %d years old\n", name, age);
+
+}