hey I am writing a program for a student management system. I need help with putting it in modules and placing functions in it. structures etc....

here is my program:

#include <stdio.h>     //Standard Input/Output Library
#include <conio.h>     //Input/OutputLibrary
#include <stdlib.h>    //Standard Library
#include <windows.h>   //WinApi header file

#include <string.h>    //String
#include <process.h>   //Process  
#include <ctype.h>     //C Type

 float Final_Score1, Course_Work, Exam;
 short int activity;
 char position [60];
 char conduct;
 int Form, comment, Surname, Christian, Subject, See;
 int Dyear, Dabsent, Slate, Dpresent;
 int a[50],n,sum=0,I;
 float avg;

 void menu ();

int main (void)
{

 //Internal Speaker Beeping

  Beep(10,350);//587 hertz (C5) for 350 milliseconds
  Sleep(1);     //2 milliseconds delay
  puts("\a");

  printf("\n");
            textcolor(12);
            gotoxy(25,2);
 				cprintf("ÚÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ¿\n");
            gotoxy(25,3);
   		 	cprintf("³        KINGSWAY HIGH SCHOOL     ³\n");
            textcolor(14);
            gotoxy(25,4);
   		 	cprintf("³                                 ³\n");
            textcolor(14);
            gotoxy(25,5);
            cprintf("³          Reporting System       ³\n");
            textcolor(14);
            gotoxy(25,6);
   		 	cprintf("³                                 ³\n");
            textcolor(12);
            gotoxy(25,7);
   		 	cprintf("ÀÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÙ\n\n");

   //CALL BY MENU

 menu ();
 getch (); //pause screen
 } //end main

 void menu ()
 {
  int input;

  //Software Information

 			textcolor(4);
			gotoxy(25,10);
			cprintf("        GREAT REPORTER  v 1.01");
         textcolor(14);
			gotoxy(17,14);
			cprintf("      [This Program is coded by Michael Mckoy]");
         textcolor(4);
			gotoxy(21,16);
			cprintf("         Computer Science Unit 2 IA");
			gotoxy(21,18);
			cprintf("        Email: [email]real_mckoy_89@live.com[/email]");
			gotoxy(24,20);
			cprintf("      Contact(Mob.): 1876-416-3695\n");
         textcolor(2);
         gotoxy(24,22);
         cprintf("             [Press ENTER]");
         getch ();

  //Menu Options

            printf("\n\n\t\tÚÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ¿\n");
   		 	printf("\t\t³\t\t      MAIN MENU   	          ³\n");
   		 	printf("\t\tÀÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÙ\n\n");

            gotoxy(18,28);
 				cprintf("ÚÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ¿\n");
            textcolor(14);
            gotoxy(18,29);
 				cprintf("³           TO LOGOUT PRESS            0      ³\n");
            textcolor(2);
            gotoxy(18,30);
            cprintf("³           STUDENT GRADES             1      ³\n");
            textcolor(14);
            gotoxy(18,31);
 				cprintf("³           FORM TEACHERS              2      ³\n");
            textcolor(2);
            gotoxy(18,32);
 				cprintf("³           ACCESS STUDENT GRADES      3      ³\n");
            textcolor(14);
            gotoxy(18,33);
 				cprintf("³           INDEPENDENT CALCULATIONS   4      ³\n");
            textcolor(2);
            gotoxy(18,34);
            cprintf("³           STUDENT INFORMATION        5      ³\n");
            textcolor(14);
            gotoxy(18,35);
 				cprintf("ÀÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÙ\n\n");

 textcolor(LIGHTGREEN);
 gotoxy(27,37);
 cprintf("  Please Choose an Operation: ");
 scanf("%d", &input);
 while(input != 0) {                                   //Terminates if zero
 switch (input) {

 case 1:

 printf("\n\n");

            printf("\t\tÚÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ¿\n");
   		 	printf("\t\t³\t           RADING SYSTEM                 ³\n");
   		 	printf("\t\tÀÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÙ\n\n");

  //STUDENT'S NAME

 textcolor(LIGHTRED);
 gotoxy(28,44);
 cprintf("  Enter Student Name: ");
 	scanf("%s%s", &Christian, &Surname);
 printf("\n_____________________________________________________________________\n");

   //SUBJECT


 printf("\t\t\t\t\nEnter Subject:   ");
 	scanf("%s", &Subject);

   //GRADING SCHEME

 printf("\n_____________________________________________________________________\n");
 printf("Score\t\tGrade\n\n");
 printf("86 - 100  	A\n");
 printf("71 - 85   	B\n");
 printf("55 - 70   	C\n");
 printf("45 - 54   	D\n");
 printf("0  - 44   	E\n\n\n");

printf("Grading Scheme :: A = Distinction, B = Credit, C = Pass, D = Week, E = Fail\n\n");

 printf("_____________________________________________________________________\n");
 printf("\nEnter Student's Course Work Score:\t");
	scanf("\n%f", &Course_Work);
 printf("Enter Student's Exam Score:\t\t");
	scanf("\n%f", &Exam);
  Final_Score1 = 40 * Course_Work / 100 + 60 * Exam / 100;
 printf("\nFinal Score is:\t\t\t\t%.1f%",Final_Score1);
 printf("\n_____________________________________________________________________\n\n");

   if(Final_Score1 >= 86)
		printf("Final Grade is:\t\t\t\tA\n");
 else
	if(Final_Score1 >= 71)
		printf("Final Grade is:\t\t\t\tB\n");
 else
	if(Final_Score1 >= 55)
		printf("Final Grade is:\t\t\t\tC\n");
 else
	if(Final_Score1 >= 44)
		printf("Final Grade is:\t\t\t\tD\n");
 else
	if(Final_Score1 >= 0)
		printf("Final Grade is:\t\t\t\tE\n");
 printf("_______________________________________________________________________\n\n");
 getch ();

 		//TEACHERS COMMENT ON STUDENT

 	printf("\n1	A focused student");
	printf("\n2	A high standard of performance");
	printf("\n3	A hardworking and capable student");
	printf("\n4	Works consistently and is making progress");
	printf("\n5	Tries hard to do well");
	printf("\n6	Works accurately");
	printf("\n7	Attends to details");
	printf("\n8	Expresses himself/herself very well");
	printf("\n9	Oral skills well developed");
	printf("\n10	Does well in practical work");
	printf("\n11	Always prepared for class");
	printf("\n12	Does well in drawing");
	printf("\n13	With greater application work should improve");
	printf("\n14	Must pay attention to theory");
	printf("\n15	Shows interest and is making progress");
	printf("\n16	Does not express ideas effectively");
	printf("\n17	Finds the subject difficult");
	printf("\n18	Should try to be competent in all aspects of the foreign language");
	printf("\n19	Has difficulty with exams");
	printf("\n20	Too often absent from class");
	printf("\n21	Practical assignment not completed");
	printf("\n22	Shows little interest");
	printf("\n23	Penmanship weak");
	printf("\n24	Test and/or assignment not done");
	printf("\n25	Needs to read more widely");
	printf("\n26	Needs to be punctual for class");
	printf("\n27	Minimum effort shown");
	printf("\n28	Poor attitude to work");
	printf("\n29	Much too talkative");
	printf("\n30	Needs to pay attention in class");
	printf("\n31	Often underprepared for class");
	printf("\n32	A noted drop in performance");
	printf("\n33	Lack of text(s) hampers progress");
	printf("\n34	Needs extra help\n");
  printf("______________________________________________________________________\n");

 printf("\n  Enter Comment Number:\t\t\t");
	scanf("%d", &comment);

 if(comment == 1)
 {		printf("\nA focused student\n");
 }
 	else
 if(comment == 2)
 {		printf("\nA high standard of performance\n");
 }
 	else
 if(comment == 3)
 {		printf("\nA hardworking and capable student\n");
 }
 	else
 if(comment == 4)
 {		printf("\nWorks consistently and is making progress\n");
 }
 	else
 if(comment == 5)
 {		printf("\nTries hard to do well\n");
 }
 	else
 if(comment == 6)
 {		printf("\nWorks accurately\n");
 }
 	else
 if(comment == 7)
 {		printf("\nAttends to details\n");
 }
 	else
 if(comment == 8)
 {		printf("\nExpresses himself/herself very well\n");
 }
 	else
 if(comment == 9)
 {		printf("\nOral skills well developed\n");
 }
 	else
 if(comment == 10)
 {		printf("\nDoes well in practical work\n");
 }
 	else
 if(comment == 11)
 {		printf("\nAlways prepared for class\n");
 }
 	else
 if(comment == 12)
 {		printf("\nDoes well in drawing\n");
 }
 	else
 if(comment == 13)
 {		printf("\nWith greater application work should improve\n");
 }
   else
 if(comment == 14)
 {		printf("\nMust pay attention to theory\n");
 }
 	else
 if(comment == 15)
 {		printf("\nShows interest and is making progress\n");
 }
 	else
 if(comment == 16)
 {		printf("\nDoes not express ideas effectively\n");
 }
 	else
 if(comment == 17)
 {		printf("\nFinds the subject difficult\n");
 }
 	else
 if(comment == 18)
 {		printf("\nShould try to be competent in all aspects of the foreign language\n");
 }
	else
 if(comment == 19)
 {		printf("\nHas difficulty with exams\n");
 }
 	else
 if(comment == 20)
 {		printf("\nToo often absent from class\n");
 }
 	else
 if(comment == 21)
 {		printf("\nPractical assignment not completed\n");
 }
 	else
 if(comment == 22)
 {		printf("\nShows little interest\n");
 }
	else
 if(comment == 23)
 {		printf("\nPenmanship weak\n");
 }
 	else
 if(comment == 24)
 {		printf("\nTest and/or assignment not done\n");
 }
	else
 if(comment == 25)
 {		printf("\nNeeds to read more widely\n");
 }
 	else
 if(comment == 26)
 {		printf("\nNeeds to be punctual for class\n");
 }
 	else
 if(comment == 27)
 {		printf("\nMinimum effort shown\n");
 }
 	else
 if(comment == 28)
 {		printf("\nPoor attitude to work\n");
 }
 	else
 if(comment == 29)
 {		printf("\nMuch too talkative\n");
 }
 	else
 if(comment == 30)
 {		printf("\nNeeds to pay attention in class\n");
 }
 	else
 if(comment == 31)
 {		printf("\nOften underprepared for class\n");
 }
 	else
 if(comment == 32)
 {		printf("\nA noted drop in performance\n");
 }
 	else
 if(comment == 33)
 {		printf("\nLack of text(s) hampers progress\n");
 }
 	else
 if(comment == 34)
 {		printf("\nNeeds extra help\n");
 }
 	else
 {      Beep(523,500);  //523 hertz (C5) for 500 milliseconds
        printf("\nInvalid! Not a Comment");
 }
 printf("\n______________________________________________________________________\n\n");

 	//STUDENT CONDUCT

 scanf("%c", &conduct);

 printf("\nO\tOutstanding");
 printf("\nG\tGood");
 printf("\nS\tSatisfactory");
 printf("\nF\tFair");
 printf("\nU\tUnsatisfactory");
 printf("\nP\tPoor");
 printf("\nD\tDisruptive");

 printf("\n\n  Enter Conduct Letter\t\t\t");
 	scanf("%c", &conduct);

 if(conduct == 'O' ||conduct == 'o')
 {		printf("\nConduct in class is Outstanding\n");
 }
 	else
 if(conduct == 'G' ||conduct == 'g')
 {		printf("\nConduct in class is Good\n");
 }
 	else
 if(conduct == 'S' ||conduct == 's')
 {		printf("\nConduct in class is Satisfactory\n");
 }
	else
 if(conduct == 'F' ||conduct == 'f')
 {		printf("\nConduct in class is Fair\n");
 }
 	else
 if(conduct == 'U' ||conduct == 'u')
 {		printf("\nConduct in class is Unsatisfactory\n");
 }
 	else
 if(conduct == 'P' ||conduct == 'p')
 {		printf("\nConduct in class is Poor\n");
 }
 	else
 if(conduct == 'D' ||conduct == 'd')
 {		printf("\nConduct in class is Disruptive\n");
 }
  	else
 {  	Beep(523,500);  //523 hertz (C5) for 500 milliseconds
 		printf("\nInvalid! Not a Conduct\n");
 }
 getch ();
 getch (); clrscr ();
 menu ();
 break;			//end case

 case 2:

    printf("\n\n");

            printf("\t\tÚÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ¿\n");
   		 	printf("\t\t³\t           FORM TEACHER                  ³\n");
   		 	printf("\t\tÀÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÙ\n\n");

 //ACTIVITY

 textcolor(3);
 gotoxy(22,46);
 cprintf("  Enter Student Name:   ");
 	scanf("%s %s", &Christian, &Surname);
 printf("\n_____________________________________________________________________\n");

	printf("\nBadminton:\t\t1");
	printf("\nBand:\t\t\t2");
	printf("\nBasketball:\t\t3");
	printf("\nBible Club:\t\t4");
	printf("\nChoir:\t\t\t5");
	printf("\nCricket:\t\t6");
	printf("\nDebating:\t\t7");
	printf("\nDrama:\t\t\t8");
	printf("\nEnvironmental:\t\t9");
	printf("\nEssay Competition:\t10");
	printf("\nFootball:\t\t11");
	printf("\nLawn Tennis:\t\t12");
	printf("\nSchool Magazine:\t13");
	printf("\nScience:\t\t14");
	printf("\nSwimming:\t\t15");
	printf("\nTable Tennis\t\t16");
	printf("\nVolley Ball:\t\t17");
 printf("\n_____________________________________________________________________\n");

printf("\n\n  Enter Activity Number:\t");
scanf("%d", &activity);

if(activity == 1)
 {		printf("\nPlays Badminton");
 }
 	else
 if(activity == 2)
 {  	printf("\nIs in the School Band");
 }
 	else
 if(activity == 3)
 {		printf("\nPlays Basketball");
 }
 	else
 if(activity == 4)
 {		printf("\nIs a member of the Bible Club");
 }
 	else
 if(activity == 5)
 {		printf("\nIs a member of the Choir");
 }
 	else
 if(activity == 6)
 {		printf("\Plays Cricket");
 }
 	else
 if(activity == 7)
 {		printf("\nIs in the Debating Club");
 }
 	else
 if(activity == 8)
 {		printf("\nIs a member of the Drama Club");
 }
 	else
 if(activity == 9)
 {		printf("\nIs a member of the Environmental Club");
 }
 	else
 if(activity == 10)
 {		printf("\nIs involved in the Essay Competition");
 }
 	else
 if(activity == 11)
 {		printf("\nPlays Football");
 }
 	else
 if(activity == 12)
 {		printf("\nPlays Lawn Tennis");
 }
 	else
 if(activity == 13)
 {		printf("\nIs on the School Magazine Committe");
 }
 		else
 if(activity == 14)
 {		printf("\nIs in the Science Club");
 }
 		else
 if(activity == 15)
 {		printf("\nDoes Swimming");
 }
 		else
 if(activity == 16)
 {		printf("\nPlays Table Tennis");
 }
 		else
 if(activity == 17)
 {		printf("\nPlays Volley Ball");
 }
 	else
 		printf("N/A");
                                     //POSITION HELD BY STUDENT
 printf("\n_____________________________________________________________________\n");

 printf("\n\n  Position (s) Held:\t");
 	scanf("%s", &position);
                                     //REGISTER
 printf("\n\n_____________________________________________________________________\n");

 printf("\nNo. Days In Year:\t");
   scanf("%d", &Dyear);
 printf("\nNo. Sessions Late:\t");
   scanf("%d", &Slate);
 printf("\nNo. Days Absent:\t");
   scanf("%d", &Dabsent);

 printf("\n_____________________________________________________________________\n");
 	Dpresent = Dyear - Dabsent;

 printf("\nStudent has been present for:\t%d of %d Days in School Year", Dpresent, Dyear);
 printf("\n_____________________________________________________________________\n");

                                      //RECOMMENDATION TO PARENT

 printf("\nPARENT/GUARDIAN please come in to see or contact \n");
 	scanf("%s", &See);
 getch (); clrscr ();
 menu ();
 break;              //end case

 case 3:

 //FIND STUDENT GRADES

    printf("\n\n");

            printf("\t\tÚÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ¿\n");
   		 	printf("\t\t³\t           STUDENT RECORDS               ³\n");
   		 	printf("\t\tÀÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÙ\n\n");

 textcolor(LIGHTRED);
 cprintf("\r\n                      Enter Student Name:   ");
 	scanf("%s%s", &Christian, &Surname);

 getch (); clrscr ();
 menu ();
 break;        //end case

 case 4:

     printf("\n\n");

            printf("\t\tÚÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ¿\n");
   		 	printf("\t\t³\t          INDEPENDENT CALCULATOR         ³\n");
   		 	printf("\t\tÀÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÙ\n\n");

 printf("\n  Enter Amount of Numbers for Operation:\t");
   scanf("%d",&n);
 printf("\n_____________________________________________________________________\n");
 printf("\nEnter Figures\n\n");
      for( I=0;I < n;I++)
      	scanf("%d",&a[I]);
         
      for( I=0;I < n;I++)
      {
      		sum=sum+a[I];
       }
       avg = sum/n;
   printf("\nThe Sum of the Numbers is:\t %d", sum);
	printf("\n\nThe Average of Numbers is:\t %.1f", avg);
 getch ();
 getch (); clrscr ();
 menu ();
 break;              //end case

 case 5:

 //STUDENT'S INFORMATION

  printf("\n\n");

            printf("\t\tÚÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ¿\n");
   		 	printf("\t\t³\t           STUDENT INFORMATION           ³\n");
   		 	printf("\t\tÀÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÙ\n\n");

 textcolor(LIGHTRED);
 cprintf("\r\n                           	    Enter Student's Form:   ");
 	scanf("%s", &Form);
 printf("\n_____________________________________________________________________\n\n");

 static const char studentinfo[] = "StudentInformation.txt";
 FILE *file = fopen(studentinfo, "r");
 if (file != NULL)
   {
      char line [ 5000 ];

      while(fgets (line, sizeof line, file) != NULL)
      {
         fputs(line, stdout);
      }
      fclose (file);
   }
   else
   {
      perror (studentinfo);
   }
 getch (); clrscr ();
 menu ();
 break;              //end case

 		  }            //end switch
getch ();
	 }                //end while
}                    //end menu
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