12. DEFINE A STRUCTURE CALLED STUDENT HAVING THE PROPERTIES OF STUDENT_ID, STUDENT NAME AND BRANCH OF THE STUDENT WITH A SUB STRUCTURE OF MARKS OF 3 SUBJECTS. WRITE A MENU DRIVEN C PROGRAM TO A. ADD NEW STUDENT DETAIL B. DELETE A STUDENT DETAIL C. DISPLAY ALL STUDENT DETAILS D. DISPLAY THE AVERAGE MARKS SCORED BY THE STUDENTS SOURCE CODE:

12. DEFINE A STRUCTURE CALLED STUDENT HAVING THE

PROPERTIES  OF STUDENT_ID, STUDENT NAME AND BRANCH OF  

THE STUDENT WITH A SUB STRUCTURE OF MARKS OF 3

SUBJECTS. WRITE A MENU DRIVEN C PROGRAM TO

A. ADD NEW STUDENT DETAIL

B. DELETE A STUDENT DETAIL

C. DISPLAY ALL STUDENT DETAILS

D. DISPLAY THE AVERAGE MARKS SCORED BY THE STUDENTS

SOURCE CODE:

#include <stdio.h>

#include<math.h>

typedef struct Student {

char name[20];

char branch[20];

char id[20];

int m1,m2,m3;

float avg;

}Student;

int main(void){

char id[10];

FILE *fp,*ft;

char another,choice;

Student s;

char fname[20];

char lname[20];

long int recsize;

fp=fopen("s.DAT","rb+");

if(fp==NULL) {

fp=fopen( "s.DAT","wb+");

if(fp==NULL) {

printf("Can't Open File");

exit();

}

}

recsize=sizeof(s);

while(1) {

printf("\n1.Add Records\n2.Delete Record \n3.ListRecords\n4.Diaply Average

Marks\n5.Exit");

printf("\nEnter your choice :");

fflush(stdin);

scanf("%c",&choice);

switch(choice) {

case'1':

fseek(fp,0,SEEK_END);

printf("\nEnter the id,name branch : ");

scanf("%s %s %s",s.id,s.name,s.branch);

printf("\nEnter the marks1 marks 2, marks 3 :");

scanf("%d %d %d",&s.m1,&s.m2,&s.m3);

s.avg=(s.m1+s.m2+s.m3)/3.0;

fwrite(&s,recsize,1,fp);

break;

case '2':

printf("Enter the id of the Student to be deleted : ");

scanf("%s",&id);

ft=fopen("TEMP.DAT","wb");

rewind(fp);

while(fread(&s,recsize,1,fp)==1) {

if(strcmp(s.id,id)!=0)

fwrite(&s,recsize,1,ft);

}

fclose(fp);

fclose(ft);

remove("s.DAT");

rename("TEMP.DAT","s.DAT");

fp=fopen("s.DAT","rb+");

break;

case '3':

rewind(fp);

while(fread(&s,recsize,1,fp)==1)

printf("\n %s %s %s %d %d

%d",s.name,s.id,s.branch,s.m1,s.m2,s.m3);

break;

case '4' :

rewind(fp);

while(fread(&s,recsize,1,fp)==1)

printf("\n %s %s %s %d %d %d

%f",s.name,s.id,s.branch,s.m1,s.m2,s.m3,s.avg);

break;

case '5':

fclose(fp);

exit();

}

}

}

Posted in: I_Sem_C_Lab