need flowchart for this code

#include

#include

#include

struct student

{

int rollno;

char name[20];

int phy_m,chem_m,math_m,eng_m,cs_m;

float per;

char grade;

int st;

};

FILE *fptr;

void display()

{

struct student st;

int n;

int flag=0;

printf("---------------------------------------------------------------------------------");

printf(" -------------------------------------------------------------------------------");

printf(" Student Report ");

printf(" -------------------------------------------------------------------------------");

printf(" ------------------------------------------------------------------------------- ");

fptr=fopen("students.txt","r");

while(fread(&st,sizeof(struct student),1,fptr))

{

if(st.rollno==n)

{

printf(" Roll number of student : %d",st.rollno);

printf(" Name of student : %s",st.name);

printf(" Marks in Chemistry : %d",st.chem_m);

printf(" Marks in Physics : %d",st.phy_m);

printf(" Marks in English: %d",st.eng_m);

printf(" Marks in Maths : %d",st.math_m);

printf(" Marks in Computer Science : %d",st.cs_m);

printf(" Percentage : %.1f",st.per);

printf(" Grade : %c",st.grade);

flag=1;

}

}

fclose(fptr);

if(flag==0){

printf(" Record does not exist !");

}

else

{

printf(" Records Displayed");

}

getch();

}

void class_result()

{

struct student st;

char ch;

system("cls");

fptr=fopen("students.txt","r");

if(fptr==NULL)

{

printf(" No Record Found!");

printf(" Create Records First !");

getch();

}

else

{

system("cls");

printf("---------------------------------------------------------------------------------");

printf(" -------------------------------------------------------------------------------");

printf(" Class Result ");

printf(" -------------------------------------------------------------------------------");

printf(" ------------------------------------------------------------------------------- ");

while(fread(&st,sizeof(struct student),1,fptr))

{

printf(" %d\t %s\t\t %d\t %d\t %d\t %d\t %d\t %.1f\t \t %c",st.rollno,st.name,st.phy_m,st.chem_m,st.math_m,st.eng_m,st.cs_m,st.per,st.grade);

}

printf(" ============================================================================= ");

printf(" All records displayed..");

fclose(fptr);

getch();

}

}

void result()

{

int ans,rno;

char ch;

system("cls");

printf("---------------------------------------------------------------------------------");

printf(" -------------------------------------------------------------------------------");

printf(" Result Menu ");

printf(" -------------------------------------------------------------------------------");

printf(" ------------------------------------------------------------------------------- ");

printf(" [1]--> Result");

printf(" [2]--> Report Card");

printf(" [3]--> Main Menu ");

printf(" Select an Option: ");

ch=getche();

//scanf("%d",&ans);

switch(ch)

{

case '1' : {

class_result();

break;

}

case '2' :

{

system("cls");

printf("---------------------------------------------------------------------------------");

printf(" -------------------------------------------------------------------------------");

printf(" Student Report ");

printf(" -------------------------------------------------------------------------------");

printf(" ------------------------------------------------------------------------------- ");

printf(" Enter the roll number : ");

scanf("%d",&rno);

display(rno);

break;

}

case '3':

break;

default: printf("\a");

}

}

void write()

{

system("cls");

struct student st;

fptr=fopen("students.txt","a+");

printf("---------------------------------------------------------------------------------");

printf(" -------------------------------------------------------------------------------");

printf(" Adding New Student ");

printf(" -------------------------------------------------------------------------------");

printf(" ------------------------------------------------------------------------------- ");

printf(" Please enter the following details ");

printf(" Enter the Roll number of student: ");

scanf("%d",&st.rollno);

fflush(stdin);

printf("Enter the Name of student: ");

gets(st.name);

printf("Enter the marks obtained in Chemistry out of 100 : ");

scanf("%d",&st.chem_m);

printf("Enter the marks obtained in English out of 100 : ");

scanf("%d",&st.eng_m);

printf("Enter the marks obtained in Physics out of 100 : ");

scanf("%d",&st.phy_m);

printf("Enter the marks obtained in Maths out of 100 : ");

scanf("%d",&st.math_m);

printf("Enter the marks obtained in Computer Science out of 100 : ");

scanf("%d",&st.cs_m);

st.per=(st.phy_m+st.chem_m+st.math_m+st.eng_m+st.cs_m)/5.0;

if(st.per>=80)

st.grade='A';

else if(st.per>=60)

st.grade='B';

else if(st.per>=50)

st.grade='C';

else if(st.per>=40)

st.grade='D';

else

st.grade='F';

// fprintf(fptr," Roll Number : %d Student Name: %s Physics Marks: %d Chemistry Marks: %d Math Marks: %d English Marks: %d Computer Science Marks: %d Percenatge: %.1f Student Grade: %c ",st.rollno,st.name,st.phy_m,st.chem_m,st.math_m,st.eng_m,st.cs_m,st.per,st.grade);

// fwrite(&st,sizeof(st),1,fptr);

fwrite (&st, sizeof(struct student), 1, fptr);

if(fwrite != 0)

printf(" Student record created ");

else

printf(" Error in writing file ! ");

fclose(fptr);

getch();

}

void display_all()

{

struct student st;

system("cls");

printf("-------------------------------------------------------------------------------");

printf(" -------------------------------------------------------------------------------");

printf(" View All Records ");

printf(" -------------------------------------------------------------------------------");

printf(" ------------------------------------------------------------------------------- ");

fptr=fopen("students.txt","r");

if (fptr == NULL)

{

fprintf(stderr, " Cannot open file ");

getch();

system("cls");

return;

}

while(fread(&st,sizeof(struct student),1,fptr))

{

printf(" Roll Number of Student : %d",st.rollno);

printf(" Name of student : %s",st.name);

printf(" Marks Obtained in Maths : %d",st.math_m);

printf(" Marks Obtained in Chemistry : %d",st.chem_m);

printf(" Marks Obtained in Physics: %d",st.phy_m);

printf(" Marks Obtained in English : %d",st.eng_m);

printf(" Marks Obtained in Computer Science : %d",st.cs_m);

printf(" Percentage is : %.2f",st.per);

printf(" Grade is : %c",st.grade);

printf(" ============================================================================ ");

}

fclose(fptr);

printf(" All Records Displayed!");

getch();

system("cls");

}

void modify_student()

{

int no,found=0;

struct student st;

system("cls");

printf("---------------------------------------------------------------------------------");

printf(" -------------------------------------------------------------------------------");

printf(" Updating Record ");

printf(" -------------------------------------------------------------------------------");

printf(" ------------------------------------------------------------------------------- ");

printf(" Please Enter the roll number of student to modify record: ");

scanf("%d",&no);

fptr=fopen("students.txt","r+"); //rb+ or ab+

while((fread(&st,sizeof(struct student),1,fptr))>0 && found==0)

{

if(st.rollno==no)

{

printf(" Roll number of student : %d",st.rollno);

printf(" Name of student : %s",st.name);

printf(" Marks Obtained in Physics : %d",st.phy_m);

printf(" Marks Obtained in Chemistry : %d",st.chem_m);

printf(" Marks Obtained in Maths : %d",st.math_m);

printf(" Marks Obtained in English : %d",st.eng_m);

printf(" Marks Obtained in Computer Science : %d",st.cs_m);

printf(" Percentage : %.2f",st.per);

printf(" Grade : %c",st.grade);

printf(" Please enter the fresh details of student ");

printf(" Enter the Roll number of student: ");

scanf("%d",&st.rollno);

fflush(stdin);

printf(" Enter the Name of student: ");

gets(st.name);

printf(" Enter the marks obtained in Physics out of 100 : ");

scanf("%d",&st.phy_m);

printf(" Enter the marks obtained in Chemistry out of 100 : ");

scanf("%d",&st.chem_m);

printf(" Enter the marks obtained in Maths out of 100 : ");

scanf("%d",&st.math_m);

printf(" Enter the marks obtained in English out of 100 : ");

scanf("%d",&st.eng_m);

printf(" Enter the marks obtained in Computer Science out of 100 : ");

scanf("%d",&st.cs_m);

st.per=(st.phy_m+st.chem_m+st.math_m+st.eng_m+st.cs_m)/5.0;

if(st.per>=80)

st.grade='A';

else if(st.per>=60)

st.grade='B';

else if(st.per>=50)

st.grade='C';

else if(st.per>=40)

st.grade='D';

else

st.grade='F';

fseek(fptr,-(long)sizeof(struct student),1);

//fprintf(fptr," Roll Number : %d Student Name: %s Physics Marks: %d Chemistry Marks: %d Math Marks: %d English Marks: %d Computer Science Marks: %d Percenatge: %.1f Student Grade: %c ",st.rollno,st.name,st.phy_m,st.chem_m,st.math_m,st.eng_m,st.cs_m,st.per,st.grade);

fwrite(&st,sizeof(struct student),1,fptr);

found=1;

}

}

fclose(fptr);

if(found==0){

printf(" Record not found ! Press and Key to Go back !");

}

else

{

printf(" Records Updated, Press and key to go back ");

}

getch();

}

void delete_all()

{

int no;

FILE *fptr2;

struct student st;

system("cls");

printf("---------------------------------------------------------------------------------");

printf(" -------------------------------------------------------------------------------");

printf(" Deleting Record ");

printf(" -------------------------------------------------------------------------------");

printf(" -------------------------------------------------------------------------------");

printf(" Please Enter The roll number of Student You Want To Delete: ");

scanf("%d",&no);

fptr=fopen("students.txt","r");

fptr2=fopen("Temp.txt","a+");

rewind(fptr);

while(fread(&st,sizeof(struct student),1,fptr))

{

if(st.rollno!=no)

{

//fprintf(fptr," Roll Number : %d Student Name: %s Physics Marks: %d Chemistry Marks: %d Math Marks: %d English Marks: %d Computer Science Marks: %d Percenatge: %.1f Student Grade: %c ",st.rollno,st.name,st.phy_m,st.chem_m,st.math_m,st.eng_m,st.cs_m,st.per,st.grade);

fwrite(&st,sizeof(struct student),1,fptr2);

}

}

fclose(fptr2);

fclose(fptr);

remove("students.txt");

rename("Temp.txt","students.txt");

printf(" Record Deleted");

getch();

}

void entry_menu()

{

char ch2;

system("cls");

printf("---------------------------------------------------------------------------------");

printf(" -------------------------------------------------------------------------------");

printf(" Entry Menu ");

printf(" -------------------------------------------------------------------------------");

printf(" ------------------------------------------------------------------------------- ");

printf(" [1]--> Create Record");

printf(" [2]--> View all Records");

printf(" [3]--> Search Record");

printf(" [4]--> Update Record");

printf(" [5]--> Delete Record");

printf(" [6]--> Main Menu ");

ch2=getche();

switch(ch2)

{

case '1':

{

write();

break;

}

case '2': {

display_all();

break;

}

case '3':

{

int num;

system("cls");

printf("---------------------------------------------------------------------------------");

printf(" -------------------------------------------------------------------------------");

printf(" Search Record ");

printf(" -------------------------------------------------------------------------------");

printf(" ------------------------------------------------------------------------------- ");

printf(" Please Enter The roll number of student to search: ");

scanf("%d",&num);

display(num);

break;

}

case '4':

{

modify_student();

break;

}

case '5': {

delete_all();

break;

}

case '6': break;

default:

{

printf("\a");

entry_menu();

}

}

}

void intro()

{

system("cls");

printf("---------------------------------------------------------------------------------");

printf(" -------------------------------------------------------------------------------");

printf(" School Result Management System ");

printf(" -------------------------------------------------------------------------------");

printf(" ");

printf(" MADE BY : SOHA MEHFOOZ ");

printf(" ");

printf(" -------------------------------------------------------------------------------");

printf(" Press Any Key To Continue !");

getch();

}

int main()

{

intro();

int ch;

do

{

system("cls");

printf("---------------------------------------------------------------------------------");

printf(" -------------------------------------------------------------------------------");

printf(" Main Menu ");

printf(" -------------------------------------------------------------------------------");

printf(" ------------------------------------------------------------------------------- ");

printf(" [1]--> Result Menu");

printf(" [2]--> Create Record");

printf(" [3]--> Exit ");

ch=getche();

switch(ch)

{

case '1':

result();

break;

case '2':

entry_menu();

break;

case '3':

printf(" ----------------------------Good-=-Bye------------------------------------- ");

exit(0);

default :

printf("\a");

}

}

while(ch!='3');

return 0;

}