Write a C Programm showing File Operations

/**************************************************************/
/*Programmed by : Vivek Patel**********************************/
/*For Bugs Free feel to contact********************************/
/*Website : www.vivekpatel.cjb.net*****************************/
/*Email : vivek_patel9@rediffmail.com**************************/
/**************************************************************/

#include
#include

struct biodata{
int recno,age;
char name[20],sex;
float salary;
};


void main(){
void addData(void);
void delData(void);
void showAll(void);
void showRecord(void);
void alterData(void);

char choice;
clrscr();

while(1){
clrscr();
textcolor(YELLOW);
cprintf(" B I O - D A T A\r\n");
printf("\n\n*****CHOOSE YOUR CHOICE*****\n");
printf("1) ADD DATA\n");
printf("2) DELETE DATA\n");
printf("3) SHOW ALL\n");
printf("4) SHOW RECORD\n");
printf("5) ALTER DATA\n");
printf("6) Exit \n");
printf("Enter your choice : ");
fflush(stdin);
choice = getche();
switch(choice){
case '1' : //call add data
addData();
break;
case '2' : //call delete data
break;
case '3' : //call show all data
showAll();
break;
case '4' : //call show record
showRecord();
break;
case '5' : //call alter data
break;
case '6' :
case 27 : clrscr();
gotoxy(25,10);
_setcursortype(_NOCURSOR);
textcolor(LIGHTMAGENTA);
cprintf("THANKS FOR USING THIS SOFTWARE");
getch();
exit(1);
}
}

}


//Adding Record to File
void addData(){
FILE *fp;
struct biodata obj;
fp = fopen("biodata.txt","a+t");
clrscr();
printf("\n*****ADDING DATA*****\n");
printf("\nEnter Record No : ");
scanf("%d",&obj.recno);
printf("Enter Name : ");
fflush(stdin);
scanf("%s",obj.name);
printf("Enter age : ");
scanf("%d",&obj.age);
fflush(stdin);
printf("Enter Sex : ");
scanf("%c",&obj.sex);
printf("Enter Salary : ");
scanf("%f",&obj.salary);
fscanf(stdin,"%d %s %d %c %f",&obj.recno,obj.name,&obj.age,&obj.sex,&obj.salary);
fprintf(fp,"%d %s %d %c %f",obj.recno,obj.name,obj.age,obj.sex,obj.salary);
fclose(fp);
}

void showRecord(){
FILE *fp;
struct biodata obj;
int rec;
long pos;
fp = fopen("biodata.txt","r");
clrscr();
printf("\n*****SHOWING SPECIFIC RECORD*****\n");
printf("\nEnter Record No : ");
scanf("%d",&rec);
pos = rec * sizeof(obj);
fseek(fp,pos,SEEK_SET);
if(feof(fp)==0)
printf("\n\nNO DATA FOUND\n");
else{
fscanf(fp,"%d %s %d %c %f",&obj.recno,obj.name,&obj.age,&obj.sex,&obj.salary);
printf("\n\n\tRecord No : %d\n",obj.recno);
printf("\tName : %s\n",obj.name);
printf("\tAge : %d\n",obj.age);
printf("\tSex : %c\n",obj.sex);
printf("\tSalary : %f\n",obj.salary);
}
getch();
fclose(fp);
}


void showAll(){
FILE *fp;
struct biodata obj;
int totrec,i;
fp = fopen("biodata.txt","r");
clrscr();
fseek(fp,0,SEEK_END);
totrec=ftell(fp)/sizeof(obj);
printf("\n*****SHOWING ALL RECORD*****\n");
printf("\n\nRecord_No\tName\t\tAge\tSex\tSalary\n\n");
printf("\n\n%d\n",totrec);
for(i=1;i<=totrec;i++){
fscanf(fp,"%d %s %d %c %f",&obj.recno,obj.name,&obj.age,&obj.sex,&obj.salary);
fprintf(stdout,"%-15d %-15s %-8d %-2c %10.2f\n",obj.recno,obj.name,obj.age,obj.sex,obj.salary);
}
getch();
fclose(fp);
}