Student Database Software Code For C++

#include<iostream>
#include<fstream>
#include<conio.h>
using namespace std;
class student
{
private:
int id;
char name[30];
char age[20];
char address[150];
char phone[20];
char qual[100];
char db[100];
public:
void getdata()
{
cout<<"Enter Student ID: ";
cin>>id;
cin.ignore();
cout<<"\nEnter Student Name: ";
gets_s(name);
cin.ignore();
cout<<"Enter Student Address: ";
gets_s(address);
cin.ignore();
cout<<"Enter Student Ph#: ";
gets_s(phone);
cin.ignore();
cout<<"Enter Student Age: ";
gets_s(age);
cin.ignore();
cout<<"Enter Student Qualification: ";
gets_s(qual);
cin.ignore();
cout<<"Enter Student Date Of Birth: ";
gets_s(db);
cin.ignore();
}
void showdata()
{
cout<<"\nID: "<<id<<endl;
cout<<"\nName: "<<name<<endl;
cout<<"\nAddress :"<<address<<endl;
cout<<"\nPh#: "<<phone<<endl;
cout<<"\nAge: "<<age<<endl;
cout<<"\nQualification: "<<qual<<endl;
cout<<"\nDate Of Birth: "<<db<<endl;
cout<<""<<endl;
}
int rtrnid()
{
return id;
}
};
void write_data()
{
          student a;
          ofstream fout;
 fout.open("d:\\student.dat",ios::binary|ios::app);
          a.getdata();
          fout.write((char*)&a,sizeof(a));
          fout.close();
}
void search (int n)
{
          student a;
          ifstream fin;
 fin.open("D:\\student.dat",ios::binary);
          while(fin.read((char*)&a,sizeof(a)))
          {
                     if(a.rtrnid()==n)
{
cout<<"\nRecord For ID "<<n<<" Is Given Below\n ";
a.showdata();
break;
}
          }
          fin.close();
}
void del(int n)
{
          student a;
          ifstream fin;
 fin.open("D:\\student.dat",ios::in|ios::binary);
          ofstream fout;
 fout.open("D:\\temp.dat",ios::out|ios::binary);
          while(fin.read((char*)&a,sizeof(a)))
          {
                      if(a.rtrnid()!=n)
 {
                      fout.write((char*)&a,sizeof(a));
 break;
 }
 fin.read((char*)&a,sizeof(a));
          }
          fin.close();
          fout.close();
 remove("D:\\student.dat");
 rename("D:\\temp.dat","D:\\student.dat");
}
void modify(int n)
{
          fstream fout;
          student a;
          int found=0,cnt=0;
 fout.open("d:\\student.dat",ios::ate|ios::in|ios::out|ios::binary);
 fout.seekg(0,ios::beg);
          while( fout.read((char*)&a,sizeof(a)))
          {cnt++;
                if(a.rtrnid()==n)
                     {
                             found=1;
a.showdata();break;
                    }
 }
 if(found)
 {
 cout<<"\nModify Above Record: "<<endl;

 fout.seekp((cnt-1)* sizeof(a));
  a.getdata();
                              fout.write((char*)&a,sizeof(a));
 cout<<"\nRecord Has Been Successfully Updated\n";
                             
 }
 else  cout<<"Record Not found";
          fout.close();
}
void main()
{
int opt;
while(1)
{
system("CLS");
cout<<"====================="<<endl;
cout<<": Students Database :"<<endl;
cout<<"====================="<<endl;
cout<<""<<endl;
cout<<"<<<<< MAIN MENU >>>>>"<<endl;
cout<<""<<endl;
cout<<"1.Enter New Student Data"<<endl;
cout<<"2.Search Student Data"<<endl;
cout<<"3.Delete Student Data"<<endl;
cout<<"4.Modify Student Data"<<endl;
cout<<"0.Exit"<<endl;
cout<<"Enter your Option : ";
cin>>opt;
switch(opt)
{
case 1:
{
system("CLS");
cout<<"<<< NEW STUDENT ENTRY >>>"<<endl;
cout<<""<<endl;
write_data();
cout<<"\nYour Data Has Been Recoded\n";
cout<<"\nPress Any Key For Main Menu";
getch();
break;
}
case 2:
{
system("CLS");
cout<<"<<< STUDNET SEARCH >>>"<<endl;
cout<<""<<endl;
int n;
cout<<"Enter Student ID to Search Record: ";
cin>>n;
search(n);
cout<<"\nPress Any Key For Main Menu";
getch();
break;
}
case 3:
{
system("CLS");
cout<<"DELETE STUDENT RECORD"<<endl;
cout<<""<<endl;
int b;
cout<<"Enter Student ID You Want To Delete: "<<endl;
cin>>b;
del(b);
cout<<"\nRecord of "<<b<<" Has been Deleted"<<endl;
cout<<"\nPress Any Key For Main Menu";
getch();
break;
}
case 4:
{
system("CLS");
cout<<"MODIFY STUDENT RECORD"<<endl;
cout<<""<<endl;
int b;
cout<<"Enter Student ID To Modify RECORD: "<<endl;
cin>>b;
modify(b);
cout<<"\nPress Any Key For Main Menu";
getch();
break;
}
case 0:
{
exit(0);
}
default:
{
cout<<""<<endl;
cout<<"Invalid Input"<<endl;
cout<<""<<endl;
}
}
}
system ("pause");
}

A SIMPLE CALCULATOR CODE FOR C++

CALCULATOR CODE

#include <iostream>
#include <math.h>
using namespace std;
int main ()
{
char ans='y';
while (ans=='y' || ans== 'Y')
{
float a,b,c,d;
double pi=3.14159265;
cout<<"                      <<@ Calculator By Hashmat naqvi @>>"<<endl;
cout<<" Press 1 for Addition"<<endl;
cout<<" Press 2 for Subtrection"<<endl;
cout<<" Press 3 for Division"<<endl;
cout<<" Press 4 for Multiplication"<<endl;
cout<<" Press 5 for Square"<<endl;
cout<<" Press 6 for Compairing Numbers"<<endl;
cout<<" Press 7 for Grades Calculator"<<endl;
cout<<" Press 8 for Cube"<<endl;
cout<<" Press 9 For Square Root"<<endl;
cout<<" press 0 For Exit"<<endl;
cout<<" Enter Your Choice : ";
cin>>c;
if (c==1)
{
cout<<"                                  ADDITION:"<<endl;
cout<<" Enter 1st Number:"<<endl;
cin>>a;
cout<<" Enter 2nd Number:"<<endl;
cin>>b;
cout<<" Result Is:"<<a+b<<endl;
}
else if (c==2)
{
cout<<"                                 SUBRRECTION:"<<endl;
cout<<" Enter 1st Number:"<<endl;
cin>>a;
cout<<" Enter 2nd Number:"<<endl;
cin>>b;
cout<<" Result Is:"<<a-b<<endl;
}
else if (c==3)
{
cout<<"                                  DIVISION:"<<endl;
cout<<" Enter 1st Number:"<<endl;
cin>>a;
cout<<" Enter 2nd Number:"<<endl;
cin>>b;
cout<<" Result Is:"<<a/b<<endl;
}
else if (c==4)
{
cout<<"                                MULTIPLICATION:"<<endl;
cout<<" Enter 1nd Number:"<<endl;
cin>>a;
cout<<" Enter 2nd Number:"<<endl;
cin>>b;
cout<<" Result Is:"<<a*b<<endl;
}
else if (c==5)
{
cout<<"                                    SQUARE:"<<endl;
cout<<" Enter Number:"<<endl;
cin>>a;
cout<<" Result is:"<<a*a<<endl;
}
else if (c==6)
{
cout<<"                              COMPAIRING NUMBERS"<<endl;
cout<<" Enter 1st Number:"<<endl;
   cin>>a;
   cout<<" Enter 2nd Number:"<<endl;
cin>>b;
cout<<" Enter 3rd Number:"<<endl;
cin>>d;
if (a>b&&a>d)
{
cout<<" 1st Number Is Greater"<<endl;
}
else if (b>a&&b>d)
{
cout<<" 2nd Number Is Greater"<<endl;
}
else
{
cout<<" 3rd Number Is Greater"<<endl;
}
}
else if (c==7)
{
cout<<"                               GRADES CALCULATOR"<<endl;
cout<<" Enter your Marks Percentage:"<<endl;
cin>>a;
if (a<60)
{
   cout<<" You are Fail : Work Hard & Try Again"<<endl;
}
   else if (a<68)
{
   cout<<" You get C : Work Hard"<<endl;
}
   else if (a<76)
{
   cout<<" You Get C+ : Good"<<endl;
}
   else if (a<83)
{
   cout<<" You Get B : V.Good"<<endl;
}
   else if (a<89)
{
   cout<<" You Get B+ : Great"<<endl;
}
   else if (a<=100)
{
   cout<<" You Get A : Excellent"<<endl;
}
   else

{
   cout<<" INVALID INPUT"<<endl;
}
}
else if (c==8)
{
cout<<"                                     CUBE"<<endl;
cout<<" Enter Number"<<endl;
cin>>a;
cout<<" Result="<<a*a*a<<endl;
}
else if (c==9)
{
cout<<"                                  SQUARE ROOT"<<endl;
cout<<" Enter Number"<<endl;
cin>>a;
cout<<" Result is="<<sqrt (a)<<endl;
}
else if (c==0)
{
cout<<"                                   Bye Bye"<<endl;
}

else
{
cout<<" INVALID INPUT"<<endl;
}
{
cout<<"                        THANKS FOR USING MY CALCULATOR"<<endl;
cout<<"                                 See You Soon"<<endl;
}
cout<<"Do YOu want to Continue or recalculate Yes(Y),No (N)";
        cin>>ans;
}
system ("pause");
return 0;
}

Cache Memory

What is Cache Memory ?

cache memory, also called Cache,  a supplementary memory system that temporarily stores frequently used instructions and data for quicker processing by the central processor of acomputer. The cache augments, and is an extension of, a computer’s main memory. Both main memory and cache are internal, random-access memories (RAMs) that use semiconductor-based transistor circuits. Cache holds a copy of only the most frequently used information or program codes stored in the main memory; the smaller capacity of the cache reduces the time required to locate data within it and provide it to the computer for processing.

When a computer’s central processor accesses its internal memory, it first checks to see if the information it needs is stored in the cache. If it is, the cache returns the data to the processor. If the information is not in the cache, the processor retrieves it from the main memory. Disk cache memory operates similarly, but the cache is used to hold data that has been recently written on, or retrieved from, a magnetic disk or other external storage device.