Page Comparison

#include<stdio.h>
#include<stdlib.h>
typedef struct student{
int rno;
char name[20];
struct subject{
int scode;
char sname[20];
int mark;
}sub[3];
int total;
float per;
}student;
void create();
void display(){
student s1;
FILE *fp;
int j;
fp=fopen("my students.txt","r");
while(fread(&s1,sizeof(student),1,fp))
{
printf("\n %-5%-20s",s1.rno,s1.name);
for(j=0;j<3;j++)
{
printf("%4d",s1.sub[j].mark);
}
printf("%5d%7.2f",s1.total,s1.per);
}
}
void append(){
student *s;
FILE fp;
int n,i,j;
printf("\n Enter how many students you want");
scanf("%d",&n);
s=(student)calloc(n,sizeof(student));
fp=fopen("my students.txt","a");
for(i=0;i<n;i++){
s[i].total=0;
s[i].per=0;
printf("\n Enter roll number:");
scanf("%d",&s[i]);
fflush(stdin);
printf("\n enter name:");
scanf("%[^\n]s",s[i].name);
for(j=0;j<3;j++)
{
printf("\n Enter marks of subject:%d",j+1);
scanf("%d",&s[i].sub[j].mark);
s[i].total+=s[i].sub[j].mark;
}
s[i].per=s[i].total/3.0;
fwrite(&s[i],sizeof(student),1,fp);
}
fclose(fp);

}
void noof_records(){
student s1;
FILE *fp;
fp=fopen("my students.txt","r");
fseek(fp,0,SEEK_END);
int n=ftell(fp)/sizeof(student);
printf("\n\n NO of Records=%d",n);
fclose(fp);
}
void search(){
student s1;
FILE *fp;
int j,rno,found=0;
fp=fopen("my students.txt","r");
printf("\n Enter roll numbers to search:");
scanf("%d",&rno);
while(fread(&s1,sizeof(student),1,fp))
{
if(s1.rno==rno)
{
found=1;
printf("\n %-5%-20s",s1.rno,s1.name);
for(j=0;j<3;j++)
{
printf("%4d",s1.sub[j].mark);
}
printf("%5d%7.2f",s1.total,s1.per);
}
if(!found)
printf("\n Record not found");
}
fclose(fp);
}
void update(){
student s1;
FILE *fp,*fp1;
int j,rno,found=0;
fp=fopen("my students.txt","r");
fp1=fopen("temp.txt","w");
printf("\n Enter roll numbers to update:");
scanf("%d",&rno);
while(fread(&s1,sizeof(student),1,fp))
{
if(s1.rno==rno)
{
found=1;
fflush(stdin);
printf("\n enter name:");
scanf("%[^\n]s",s1.name);
for(j=0;j<3;j++)
{
printf("\n Enter marks of subject:%d",j+1);
scanf("%d",&s1.sub[j].mark);
s1.total+=s1.sub[j].mark;
}
s1.per=s1.total/3.0;
fwrite(&s1,sizeof(student),1,fp);
fclose(fp);
fclose(fp1);
if(found){
fp1=fopen("temp.txt","r");
fp=fopen("my students.txt","w");
while(fread(&s1,sizeof(student),1,fp)){
fwrite(&s1,sizeof(student),1,fp);
}
}
else
printf("\n Record is not found");
}

}
fclose(fp);
fclose(fp1);

}
void delete(){
student s1;
FILE *fp,*fp1;
int j,rno,found=0;
fp=fopen("my students.txt","r");
fp1=fopen("temp.txt","w");
printf("\n Enter roll numbers to Delete:");
scanf("%d",&rno);
while(fread(&s1,sizeof(student),1,fp))
{
if(s1.rno==rno)
{
found=1;
}
else
fwrite(&s1,sizeof(student),1,fp);
fclose(fp);
fclose(fp1);
if(found){
fp1=fopen("temp.txt","r");
fp=fopen("my students.txt","w");
while(fread(&s1,sizeof(student),1,fp)){
fwrite(&s1,sizeof(student),1,fp);
}
}
else
printf("\n Record is not found");

}
fclose(fp);
fclose(fp1);

}
int main(){
int ch;
do{
printf("\n1.create");
printf("\n2.display");
printf("\n3.Append");
printf("\n4.No of Records");
printf("\n5.Search");
printf("\n6.Update");
printf("\n7.Delete");
printf("\n0.Exit");
printf("\n Enter your choice:");
scanf("%d",&ch);
switch(ch){
case 1:
create();
break;
case 2:
display();
break;
case 3:
append();
break;
case 4:
noof_records();
break;
case 5:
search();
break;
case 6:
update();
break;
case 7:
delete();
break;
}
}
while(ch !=0);
return 0;public static Component getOrder()
{
Component order = new Composite( "Order" ) ;
order.addChild(
new Leaf("Crispy Onion Strings", 5.50 ));
order.addChild(
new Leaf("The Purist", 8.00 ));
CustomBurger customBurger = new
CustomBurger( "Build Your Own Burger" ) ;

// base price for 1/3 lb
Burger b = new Burger( "Burger Options" ) ;
String[] bo =
{ "Beef", "1/3lb.", "On A Bun" } ;
b.setOptions( bo ) ;

// 1 cheese free, extra cheese +1.00
Cheese c = new Cheese( "Cheese Options" ) ;
String[] co =
{ "Danish Blue Cheese",
"Horseradish Cheddar" } ;
c.setOptions( co ) ;
c.wrapDecorator( b ) ;

// 4 toppings free, extra +.75
Toppings t = new Toppings(
"Toppings Options" ) ;
String[] to =
{ "Bermuda Red Onion",
"Black Olives", "Carrot Strings",   
"Coleslaw" } ;
t.setOptions( to ) ;
t.wrapDecorator( c ) ;

// premium topping +1.50
Premium p =
new Premium( "Premium Options" ) ;
String[] po = { "Applewood Smoked Bacon" } ;
p.setOptions( po ) ;
p.wrapDecorator( t ) ;

// 1 sauce free, extra +.75
Sauce s = new Sauce( "Sauce Options" ) ;
String[] so = { "Appricot Sauce" } ;
s.setOptions( so ) ;
s.wrapDecorator( p ) ;

// Setup Custom Burger Ingredients
customBurger.setDecorator( s ) ;
customBurger.addChild( b ) ;
customBurger.addChild( c ) ;
customBurger.addChild( t ) ;
customBurger.addChild( p ) ;
customBurger.addChild( s ) ;

// Add Custom Burger to the ORder
order.addChild( customBurger );
return order ;
}

}