Code

#include<stdio.h>

#include<conio.h>

struct student

{

int rollno;

char name[50];

int p_marks,c_marks,m_marks,e_marks,cs_marks;

float per;

char grade;

int std;

} st;

FILE *fptr;

void write_student()

{

fptr=fopen("student.dat","ab");

printf("\nPlease Enter The New Details of student \n");

printf("\nEnter The roll number of student ");

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

fflush(stdin);

printf("\n\nEnter The Name of student ");

gets(st.name);

printf("\nEnter The marks in MAT121 out of 100 : ");

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

printf("\nEnter The marks in CSE122 out of 100 : ");

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

printf("\nEnter The marks in CSE123 out of 100 : ");

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

printf("\nEnter The marks in PHY123 out of 100 : ");

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

printf("\nEnter The marks in PHY124 out of 100 : ");

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

st.per=(st.p_marks+st.c_marks+st.m_marks+st.e_marks+st.cs_marks)/5.0;

if(st.per>=80)

st.grade='A';

else if(st.per>=60 &&st.per<=79)

st.grade='B';

else if(st.per>=40 &&st.per<=59)

st.grade='C';

else if(st.per>=0 &&st.per<=39)

st.grade='F';

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

fclose(fptr);

printf("\n\nStudent Record Has Been Created ");

getch();

}

void display_all()

{

printf("\n\n\n\t\tDISPLAY ALL RECORD !!!\n\n");

fptr=fopen("student.dat","rb");

while((fread(&st,sizeof(st),1,fptr))>0)

{

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

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

printf("\nMarks in MAT121 : %d",st.p_marks);

printf("\nMarks in CSE122 : %d",st.c_marks);

printf("\nMarks in CSE123 : %d",st.m_marks);

printf("\nMarks in PHY123 : %d",st.e_marks);

printf("\nMarks in PHY124 : %d",st.cs_marks);

printf("\nPercentage of student is : %.2f",st.per);

printf("\nGrade of student is : %c",st.grade);

printf("\n\n====================================\n");

getch();

}

fclose(fptr);

getch();

}

void display_sp(int n)

{

int flag=0;

fptr=fopen("student.dat","rb");

while((fread(&st,sizeof(st),1,fptr))>0)

{

if(st.rollno==n)

{

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

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

printf("\nMarks in MAT121 : %d",st.p_marks);

printf("\nMarks in CSE122 : %d",st.c_marks);

printf("\nMarks in CSE123 : %d",st.m_marks);

printf("\nMarks in PHY123 : %d",st.e_marks);

printf("\nMarks in PHY124 : %d",st.cs_marks);

printf("\nPercentage of student is : %.2f",st.per);

printf("\nGrade of student is : %c",st.grade);

flag=1;

}

fclose(fptr);

if(flag==0)

printf("\n\nrecord not exist");

getch();

}

void modify_student()

{

int no,found=0;

printf("\n\n\tTo Modify ");

printf("\n\n\tPlease Enter The roll number of student");

scanf("%d",&no);

fptr=fopen("student.dat","rb+");

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

{

if(st.rollno==no)

{

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

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

printf("\nMarks in MAT121 : %d",st.p_marks);

printf("\nMarks in CSE122 : %d",st.c_marks);

printf("\nMarks in CSE123 : %d",st.m_marks);

printf("\nMarks in PHY123 : %d",st.e_marks);

printf("\nMarks in PHY124 : %d",st.cs_marks);

printf("\nPercentage of student is : %.2f",st.per);

printf("\nGrade of student is : %c",st.grade);

printf("\nPlease Enter The New Details of student \n");

printf("\nEnter The roll number of student ");

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

fflush(stdin);

printf("\n\nEnter The Name of student ");

gets(st.name);

printf("\nEnter The marks in MAT121 out of 100 : ");

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

printf("\nEnter The marks in CSE122 out of 100 : ");

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

printf("\nEnter The marks in CSE123 out of 100 : ");

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

printf("\nEnter The marks in PHY123 out of 100 : ");

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

printf("\nEnter The marks in PHY124 out of 100 : ");

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

st.per=(st.p_marks+st.c_marks+st.m_marks+st.e_marks+st.cs_marks)/5.0;

if(st.per>=80)

st.grade='A';

else if(st.per>=60 &&st.per<=79)

st.grade='B';

else if(st.per>=40 &&st.per<=59)

st.grade='C';

else if(st.per>=0 &&st.per<=39)

st.grade='F';

fseek(fptr,-(long)sizeof(st),1);

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

printf("\n\n\t Record Updated");

found=1;

}

fclose(fptr);

if(found==0)

printf("\n\n Record Not Found ");

getch();

}

void delete_student()

{

int no;

FILE *fptr2;

printf("\n\n\n\tDelete Record");

printf("\n\nPlease Enter The roll number of student You Want To Delete");

scanf("%d",&no);

fptr=fopen("student.dat","rb");

fptr2=fopen("Temp.dat","wb");

rewind(fptr);

while((fread(&st,sizeof(st),1,fptr))>0)

{

if(st.rollno!=no)

{

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

}

fclose(fptr2);

fclose(fptr);

remove("student.dat");

rename("Temp.dat","student.dat");

printf("\n\n\tRecord Deleted ..");

getch();

}

void class_result()

{

fptr=fopen("student.dat","rb");

if(fptr==NULL)

{

printf("ERROR!!! FILE COULD NOT BE OPEN\n\n\n Go To Entry Menu to create File");

printf("\n\n\n Program is closing ....");

getch();

exit(0);

}

printf("\n\n\t\tALL STUDENTS RESULT \n\n");

printf("====================================================\n");

printf("R.No. Name P C M E CS %age Grade\n");

printf("====================================================\n");

while((fread(&st,sizeof(st),1,fptr))>0)

{

printf("%-6d %-10s %-3d %-3d %-3d %-3d %-3d %-3.2f %-1c\n",st.rollno,st.name,st.p_marks,st.c_marks,st.m_marks,st.e_marks,st.cs_marks,st.per,st.grade);

}

fclose(fptr);

getch();

}

void result()

{

int ans,rno;

char ch;

printf("\n\n\nRESULT MENU");

printf("\n\n\n1. Class Result\n\n2. Individual Student result \n\n3.Back to Main Menu");

printf("\n\n\nEnter Choice (1/2)? ");

scanf("%d",&ans);

switch(ans)

{

case 1 :

class_result();

break;

case 2 :

{

char ans;

printf("\n\nEnter Roll Number Of Student : ");

scanf("%d",&rno);

display_sp(rno);

printf("\n\nDo you want to See More Result (y/n)?");

fflush(stdin);

scanf("%c",&ans);

}

while(ans=='y'||ans=='Y');

break;

}

case 3:

break;

default:

printf("\a");

}

void intro()

{

printf("\t\t----------------------------------------------------------------------------------------\n");

printf("\n \t\t\t\t\t\tSubmitted by :\n");

printf("\n \t\t\t\t\t ---------------\n");

printf("\t\t\t\tName: \t\t\t\t\tI'd: \n");

printf("\t\t\t\t----- \t\t\t\t\t----- \n\n");

printf("\t\t\t\t1: Sakibul Islam \t\t\t203-15-3883 \n");

printf("\t\t\t\t2: shahriar \t\t\t201-15-3325 \n");

printf("\t\t\t\t3: Nayeem \t\t\t203-15-3861 \n ");

printf("\t\t\t\t4: M.Mukit mosfiq\t\t\t203-15-3884 \n\n\n");

printf("\t\t\t\t5: Mahmudul \t\t\t201-15-3354 \n\n\n");

printf("\t\t----------------------------------------------------------------------------------------\n");

getch();

}

void entry_menu()

{

char ch2;

printf("\n\n\n\tENTRY MENU");

printf("\n\n\t1.CREATE STUDENT RECORD");

printf("\n\n\t2.DISPLAY ALL STUDENTS RECORDS");

printf("\n\n\t3.SEARCH Individual STUDENT result ");

printf("\n\n\t4.MODIFY STUDENT RECORD");

printf("\n\n\t5.DELETE STUDENT RECORD");

printf("\n\n\t6.BACK TO MAIN MENU");

printf("\n\n\tPlease Enter Your Choice (1-6) ");

ch2=getche();

switch(ch2)

{

case '1':

write_student();

break;

case '2':

display_all();

break;

case '3':

{

int num;

printf("\n\n\tPlease Enter The roll number ");

scanf("%d",&num);

display_sp(num);

}

break;

case '4':

modify_student();

break;

case '5':

delete_student();

break;

case '6':

break;

default:

printf("\a");

entry_menu();

}

void main()

{

char ch;

intro();

{

printf("\n\n\n\tMAIN MENU");

printf("\n\n\t01. RESULT MENU");

printf("\n\n\t02. ENTRY/EDIT MENU");

printf("\n\n\t03. EXIT");

printf("\n\n\tPlease Select Your Option (1-3) ");

ch=getche();

switch(ch)

{

case '1':

result();

break;

case '2':

entry_menu();

break;

case '3':

exit(0);

default :

printf("\a");

}

while(ch!='3');

}