C

learnc/learnc10.c

@@ -0,0 +1,23 @@
+#include <stdio.h>
+
+typedef struct {
+  char * name;
+  int age;
+} person;
+
+/* function declaration */
+void birthday(person * p) {
+
+    p->age++;
+}
+int main() {
+  person john;
+  john.name = "John";
+  john.age = 27;
+
+  printf("%s is %d years old.\n", john.name, john.age);
+  birthday(&john);
+  printf("Happy birthday! %s is now %d years old.\n", john.name, john.age);
+
+  return 0;
+}