diff --git a/work1/single.c b/work1/single.c
index 6e7d813..4f98a42 100644
--- a/work1/single.c
+++ b/work1/single.c
@@ -1,8 +1,28 @@
 #include "stdio.h"
 #include "stdlib.h"
 
-int main() {
+struct person_tag {
+    char name[20];
+    char id[10];
+};
+
+struct course_tag {
+    char course_name[20];
+    int no_of_units;
+    int marks[4];
+    float avg;
+};
+
+void display_students(void);
+void search_student(void);
+void find_maximum(void);
+void find_failed(void);
+void update_file();
+void read_file();
+void quite();
+
+int main(void) {
     printf("Welcome!");
-    
+
     printf("Goodbye!");
 }
\ No newline at end of file