#include #include #include struct product { int id; char name; int price; int qty; }; struct Bill { int pid; char pname; int pprice; }; char mygetch(); int getid(); int billfileno(); void manageproduct(); void purchaseproduct(); void generatebill(); void addproduct(); void displayallproducts(); struct product findproduct(int id); void updateproduct(int id, int qty); char fproduct[]={\"product.txt\"}; char fbill[]={\"bill.txt\"}; int total=0; int main() { File *fp; int ch; while(1) { printf(\"welcome product management system\ \"); printf(\"manage product\ \"); printf(\"\\purchase product\ \"); printf(\"generate bill\ \"); printf(\"exit\ \"); printf(\"enter your choice\"); scanf(\"%d\",&ch); switch(ch) { case1:manageproduct(); break; case2:purchaseproduct(); break; case3:generate bill(); break; case4:exit(); } mygetch(); } return 0; int getid() { file *fp; int value=0; fp=fopen(\"product.txt\",\"r\"); if(fp==null) { fp=fopen(\"product.txt\",\"w\"); fprint(fp,\"%d\",0); fclose(fp); fp=fopen(\"product.txt\",\"r\"); } fscanf(fp,\"%d\",&value); fclose(fp); fp=fopen(\"product.txt\",\"w\"); fprintf(\"fp,\"%d\",value+1); fclose(fp);return value+1; void manageproduct() { int ch init back=0; while(1) { printf(\"welcome product management system\ \"); printf(\"1.add new product\ \"); printf(\"2.display all products\ \"); printf(\"back\ \"); printf(\"enter your choice\ \"); scanf(\"%d\",&ch); switch(ch) { case1:addproduct(); break; case2:displayallproduct(); break; case3:(back==1) break; else { mygetch(); } } } void addproduct() { file *fp; struct product t1; fp=fopen(fproduct,\"ab\"); t1.id=getid(); printf(\"enter product name\"); scanf(\"%s\",&t1.name); printf(\"enter product price\"); scanf(\"%d\",&t1.price); printf(\"enter product qty\"); scanf(\"%d\",&t1.qty); fwrite(&t1,sizeof(t1),1,fp); fclose(fp); void dis[playallproducts() { file *fp; struct product t; int id,found=0; fp=fopen(fproduct,\"rb\"); printf(\"product details\ \"); printf(\"id\\t name \\tqty\\tprice\ \ \"); while(1) { fread(&t,sizeof(t),1,fp); if(feof(fp)) { break; } printf(\"%d\\t\",t.id); printf(\"%s\\t\",t.name); printf(\"%d\\t\",t.qty); printf(\"%d\\t\",t.price); fclose(fp); } void purchase product() char ch1,ch2; int id; while(1) { displayallproducts(); _fpurge(stdin); printf(\"do u want to purchase y/n\"); scanf(\"%c\",&ch1); if(ch1==\'y\') { file *fp; struct bill t1; struct product t2; fp=fopen(fbill,\"ab\"); printf(\"enter the product id to purchase\"); scanf(\"%d\",&id); t2=findproduct(id); t1.pid=t2.id; strcpy(t1.pname,t2.name); t1.pprice=t2.price; fwrite(&t1,sizeof(t1),1,fp); fclose(fp); } _fpurge(stdin); printf(\"do u want to continue y/n\"); scanf(\"%c\",&ch2); if(ch2==\'n\') { break; } mygetch(); } } struct product findproduct(int id) { file *fp; struct product t; fp=fopen(fproduct,\"rb\"); if(feof(fp)) { break; } if(t.id==id) { updateproduct(id,t.qty-1); break; } } fclose(fp); return t; } void updateproduct(int id,int qty) { file *fp,*fp1; struct product t,t1; int found=.

1. #include
#include
#include
struct product
{
int id;
char name;
int price;
int qty;
};
struct Bill
{
int pid;
char pname;
int pprice;
};
char mygetch();
int getid();
int billfileno();
void manageproduct();
void purchaseproduct();
void generatebill();
void addproduct();
void displayallproducts();
struct product findproduct(int id);
void updateproduct(int id, int qty);
char fproduct[]={"product.txt"};
char fbill[]={"bill.txt"};
int total=0;
int main()
{
File *fp;
int ch;
while(1)
{

2. printf("welcome product management system ");
printf("manage product ");
printf("purchase product ");
printf("generate bill ");
printf("exit ");
printf("enter your choice");
scanf("%d",&ch);
switch(ch)
{
case1:manageproduct();
break;
case2:purchaseproduct();
break;
case3:generate bill();
break;
case4:exit();
}
mygetch();
}
return 0;
int getid()
{
file *fp;
int value=0;
fp=fopen("product.txt","r");
if(fp==null)
{
fp=fopen("product.txt","w");
fprint(fp,"%d",0);
fclose(fp);
fp=fopen("product.txt","r");
}
fscanf(fp,"%d",&value);
fclose(fp);
fp=fopen("product.txt","w");
fprintf("fp,"%d",value+1);

3. fclose(fp);return value+1;
void manageproduct()
{
int ch
init back=0;
while(1)
{
printf("welcome product management system ");
printf("1.add new product ");
printf("2.display all products ");
printf("back ");
printf("enter your choice ");
scanf("%d",&ch);
switch(ch)
{
case1:addproduct();
break;
case2:displayallproduct();
break;
case3:(back==1)
break;
else
{
mygetch();
}
}
}
void addproduct()
{
file *fp;
struct product t1;
fp=fopen(fproduct,"ab");
t1.id=getid();
printf("enter product name");
scanf("%s",&t1.name);
printf("enter product price");

4. scanf("%d",&t1.price);
printf("enter product qty");
scanf("%d",&t1.qty);
fwrite(&t1,sizeof(t1),1,fp);
fclose(fp);
void dis[playallproducts()
{
file *fp;
struct product t;
int id,found=0;
fp=fopen(fproduct,"rb");
printf("product details ");
printf("idt name tqtytprice ");
while(1)
{
fread(&t,sizeof(t),1,fp);
if(feof(fp))
{
break;
}
printf("%dt",t.id);
printf("%st",t.name);
printf("%dt",t.qty);
printf("%dt",t.price);
fclose(fp);
}
void purchase product()
char ch1,ch2;
int id;
while(1)
{
displayallproducts();
_fpurge(stdin);
printf("do u want to purchase y/n");
scanf("%c",&ch1);
if(ch1=='y')

5. {
file *fp;
struct bill t1;
struct product t2;
fp=fopen(fbill,"ab");
printf("enter the product id to purchase");
scanf("%d",&id);
t2=findproduct(id);
t1.pid=t2.id;
strcpy(t1.pname,t2.name);
t1.pprice=t2.price;
fwrite(&t1,sizeof(t1),1,fp);
fclose(fp);
}
_fpurge(stdin);
printf("do u want to continue y/n");
scanf("%c",&ch2);
if(ch2=='n')
{
break;
}
mygetch();
}
}
struct product findproduct(int id)
{
file *fp;
struct product t;
fp=fopen(fproduct,"rb");
if(feof(fp))
{
break;
}
if(t.id==id)
{
updateproduct(id,t.qty-1);

6. break;
}
}
fclose(fp);
return t;
}
void updateproduct(int id,int qty)
{
file *fp,*fp1;
struct product t,t1;
int found=0;
fp=fopen(fproduct,"rb");
fp1fopen("temp.txt","wb");
while(1)
{
fread(&t,sizeof(t),1,fp);
if(feof(fp))
{
break;
if(t.id==id)
{
found=1;
t.qty=qty;
fwrite(&t,sizeof(t),1,fp1);
else
{
fwrite(&t,sizeof(t),1,fp1);
}
}
fclose(fp);
fclose(fp1);
if(found==0)
{
printf("no record found ");
else
{

7. fp=fopen(fproduct,"wb");
fp1=fopen("temp.txt","rb");
while(1)
{
fread(&t,sizeof(t),1,fp1);
if(feof(fp1))
{
break;
}
fwrite(&t,sizeof(t),1,fp);
}
}
fclose(fp);
fclose(fp1);
}
vooud generatebill()
{
file *fp,*fp1;
struct Bill t;
int id ,found=0;
char ch1;
int brel=0;
char billname
fp=fopen(fbill,"rb");
printf("bill details");
printf("pro.idtpro.nametpro.price ");
while(1)
fread(&t,sizeof(t),1,fp);
if(feof(fp))
{
break;
}
printf("%dt",t.pid);
printf("%st",t.pname);
printf("%dt",t.pprice);
total=total+t.price;

8. }
printf("total bill amount=",total);
fclose(fp);
if(total !=0)
{
_fpurge(stdin);
printf("u want to generate final bill y/n");
scanf("%d",&ch1);
if(ch1=='y')
{
brel=billfileno();
sprintf(billname,"%s%d","",brel);
strcat(billname,".txt");
fp=fopen(fbill,"rb");
fpl=fopen(billname,"wb");
while(1)
{
fread(
Solution
#include
#include
#include
struct product
{
int id;
char name;
int price;
int qty;
};
struct Bill
{
int pid;
char pname;
int pprice;

9. };
char mygetch();
int getid();
int billfileno();
void manageproduct();
void purchaseproduct();
void generatebill();
void addproduct();
void displayallproducts();
struct product findproduct(int id);
void updateproduct(int id, int qty);
char fproduct[]={"product.txt"};
char fbill[]={"bill.txt"};
int total=0;
int main()
{
File *fp;
int ch;
while(1)
{
printf("welcome product management system ");
printf("manage product ");
printf("purchase product ");
printf("generate bill ");
printf("exit ");
printf("enter your choice");
scanf("%d",&ch);
switch(ch)
{
case1:manageproduct();
break;
case2:purchaseproduct();
break;
case3:generate bill();
break;
case4:exit();

10. }
mygetch();
}
return 0;
int getid()
{
file *fp;
int value=0;
fp=fopen("product.txt","r");
if(fp==null)
{
fp=fopen("product.txt","w");
fprint(fp,"%d",0);
fclose(fp);
fp=fopen("product.txt","r");
}
fscanf(fp,"%d",&value);
fclose(fp);
fp=fopen("product.txt","w");
fprintf("fp,"%d",value+1);
fclose(fp);return value+1;
void manageproduct()
{
int ch
init back=0;
while(1)
{
printf("welcome product management system ");
printf("1.add new product ");
printf("2.display all products ");
printf("back ");
printf("enter your choice ");
scanf("%d",&ch);
switch(ch)
{
case1:addproduct();

11. break;
case2:displayallproduct();
break;
case3:(back==1)
break;
else
{
mygetch();
}
}
}
void addproduct()
{
file *fp;
struct product t1;
fp=fopen(fproduct,"ab");
t1.id=getid();
printf("enter product name");
scanf("%s",&t1.name);
printf("enter product price");
scanf("%d",&t1.price);
printf("enter product qty");
scanf("%d",&t1.qty);
fwrite(&t1,sizeof(t1),1,fp);
fclose(fp);
void dis[playallproducts()
{
file *fp;
struct product t;
int id,found=0;
fp=fopen(fproduct,"rb");
printf("product details ");
printf("idt name tqtytprice ");
while(1)
{
fread(&t,sizeof(t),1,fp);

12. if(feof(fp))
{
break;
}
printf("%dt",t.id);
printf("%st",t.name);
printf("%dt",t.qty);
printf("%dt",t.price);
fclose(fp);
}
void purchase product()
char ch1,ch2;
int id;
while(1)
{
displayallproducts();
_fpurge(stdin);
printf("do u want to purchase y/n");
scanf("%c",&ch1);
if(ch1=='y')
{
file *fp;
struct bill t1;
struct product t2;
fp=fopen(fbill,"ab");
printf("enter the product id to purchase");
scanf("%d",&id);
t2=findproduct(id);
t1.pid=t2.id;
strcpy(t1.pname,t2.name);
t1.pprice=t2.price;
fwrite(&t1,sizeof(t1),1,fp);
fclose(fp);
}
_fpurge(stdin);
printf("do u want to continue y/n");

13. scanf("%c",&ch2);
if(ch2=='n')
{
break;
}
mygetch();
}
}
struct product findproduct(int id)
{
file *fp;
struct product t;
fp=fopen(fproduct,"rb");
if(feof(fp))
{
break;
}
if(t.id==id)
{
updateproduct(id,t.qty-1);
break;
}
}
fclose(fp);
return t;
}
void updateproduct(int id,int qty)
{
file *fp,*fp1;
struct product t,t1;
int found=0;
fp=fopen(fproduct,"rb");
fp1fopen("temp.txt","wb");
while(1)
{
fread(&t,sizeof(t),1,fp);

14. if(feof(fp))
{
break;
if(t.id==id)
{
found=1;
t.qty=qty;
fwrite(&t,sizeof(t),1,fp1);
else
{
fwrite(&t,sizeof(t),1,fp1);
}
}
fclose(fp);
fclose(fp1);
if(found==0)
{
printf("no record found ");
else
{
fp=fopen(fproduct,"wb");
fp1=fopen("temp.txt","rb");
while(1)
{
fread(&t,sizeof(t),1,fp1);
if(feof(fp1))
{
break;
}
fwrite(&t,sizeof(t),1,fp);
}
}
fclose(fp);
fclose(fp1);
}
vooud generatebill()

15. {
file *fp,*fp1;
struct Bill t;
int id ,found=0;
char ch1;
int brel=0;
char billname
fp=fopen(fbill,"rb");
printf("bill details");
printf("pro.idtpro.nametpro.price ");
while(1)
fread(&t,sizeof(t),1,fp);
if(feof(fp))
{
break;
}
printf("%dt",t.pid);
printf("%st",t.pname);
printf("%dt",t.pprice);
total=total+t.price;
}
printf("total bill amount=",total);
fclose(fp);
if(total !=0)
{
_fpurge(stdin);
printf("u want to generate final bill y/n");
scanf("%d",&ch1);
if(ch1=='y')
{
brel=billfileno();
sprintf(billname,"%s%d","",brel);
strcat(billname,".txt");
fp=fopen(fbill,"rb");
fpl=fopen(billname,"wb");
while(1)

16. {
fread(