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Write a Object Oriented Program to Display Studnet Information

// Write a Object Oriented Program to Display Studnet Information

#include<iostream>
#include<stdio.h>
#include<cstdlib>
#include<conio.h>
#include<iomanip>
#include<cstring>
using namespace std;

class student
{
public:

char first_name[50], last_name[50];
int roll;
float ban_mark,eng_mark,mat_mark;

};

int main()
{

student infor;

char option, select;


FILE *fp;
fp=fopen("users.txt","rb+");

if (fp == NULL)
{
fp = fopen("users.txt","wb+");

return 0;

}


while(1)
{

system("cls");
cout << "\n\n";
cout << "\t\t****** INFORMATION OF STUDENTS ******";
cout << "\n\n";
cout << "\n \t\t 1. Add Students";
cout << "\n \t\t 2. Show Records";
cout << "\n \t\t 3. Exit";
cout << "\n\n";
cout <<"\t Select What you want:> infor.first_name;
cout << "Last Name : ";
cin >> infor.last_name;
cout << "Roll No : ";
cin >> infor.roll;
cout << "Marks of Bangla : ";
cin >> infor.ban_mark;
cout << "Marks of English : ";
cin >> infor.eng_mark;
cout << "Marks of Mathmetic : ";
cin >> infor.mat_mark;

fwrite(&infor,sizeof(infor),1,fp);
cout << "\n Add Another Record (Y/N) ";
fflush(stdin);
option = getchar();
}
break;
case '2':
system("cls");
rewind(fp);
cout << "=== View the Records in the Database ===";
cout << "\n";
while (fread(&infor,sizeof(infor),1,fp) == 1)
{
cout << "\n";
cout <<"\t Name of Students : "<< infor.first_name << setw(5)<< infor.last_name;
cout << "\n";
cout <<"\t Roll No : " <<infor.roll;
cout << "\n";
cout <<"\t Bangla : " <<infor.ban_mark;
cout << "\n";
cout << "\t English : " <<infor.eng_mark;
cout << "\n";
cout <<"\t Mathmetics : " <<infor.mat_mark<<endl;
cout<<"\t" <<endl<<"================================="<<endl;
}
cout << "\n\n";
system("pause");
break;

case '3':
system("cls");
fclose(fp);
cout << "\n\n";
cout << "\t\t********************************************************"<<endl;
cout << "\t\t* THANKS BY MD.HASMOT HOSSEN. *"<<endl;
cout << "\t\t********************************************************"<<endl;
cout << "\n\n";
exit(0);
}
}

system("pause");
return 0;
}

Write a program calculate square and cube of given number using inheritance

// write a program calculate square and cube of given number using inheritance

#include<iostream>
using namespace std;
//using by inheritence

class hasmot_cal
{

public:
int a,b,output;
void setnub1(int a)
{
 nub1=a;
}

void setnub2( int b)
{
 nub2=b;
}
protected:
   int nub1=a;
   int nub2=b;
};

class addition:public hasmot_cal
{

public:
void ad()
{
int a,b;
cout<<"\n \n"<<"enter your addition digit?";
cin>>a>>b;
output=a+b;
cout<<""<<"your addition output = "<<" "<<output<<endl;
}
};


class Subtraction:public hasmot_cal
{
public:
void su()
{
int a,b;
cout<<"\n \n"<<"enter your Subtraction digit?";
cin>>a>>b;
output=a-b;
cout<<""<<"your Subtraction output = "<<" "<<output<<endl;
}
};

int main()
{
hasmot_cal ajaira;
addition ss;
ss.ad();
Subtraction pp;
pp.su();

return 0;
};

Write a program calculate square and cube of given number using constractor

// write a program calculate square and cube of given number using constractor
#include<iostream>
using namespace std;
class ac
{
public:
int n;
ac();
~ac();
void sq();
void cb();
};
ac::ac()
{
cout<<"Enter the number : ";
cin>>n;
}
ac::~ac()
{
cout<<""<<endl;
}
void ac::sq()
{
cout<<" The value of square is : "<<n*n;
}
void ac::cb()
{
cout<<" The value of cube is : "<<n*n*n;
}

int main()
{
ac sss;
sss.sq();
cout<<endl;
sss.cb();
//return 0;
}

Write a program calculate square and cube of given number using polymafaiom

//write a program calculate square and cube of given number using polymafaiom
#include<iostream>
using namespace std;

class sc
{
public:
void setnum(int n)
{
number=n;
}
protected: int number;
};

class square: public sc
{

public:
int re;
void sq()
{
re=number*number;
cout<<"The result of sq : "<<re;
}

};
class cube: public sc
{

public:
int re;
void cub()
{
re=number*number*number;
cout<<"The result of cube : "<<re;
}

};

int main()
{
int n;
square s;
cube cb;
sc *p1=&s;
sc *p2=&cb;
cout<<"Enter the number ofr sq: ";
cin>>n;
p1->setnum(n);
s.sq();
cout<<"\n\nEnter the number for cube: ";
cin>>n;
p2->setnum(n);
cb.cub();
return 0;
}

Write a program calculate square and cube of given number using inheritance

// write a program calculate square and cube of given number using inheritance

#include<iostream>
using namespace std;
//using by inheritence

class hasmot_cal
{
public:
int a,b,output;
void setnub1(int a)
{
 nub1=a;
}

void setnub2( int b)
{
 nub2=b;
}
protected:
   int nub1=a;
   int nub2=b;
};

class addition:public hasmot_cal
{
public:
void ad()
{
int a,b;
cout<<"\n \n"<<"enter your addition digit?";
cin>>a>>b;
output=a+b;
cout<<""<<"your addition output = "<<" "<<output<<endl;
}
};


class Subtraction:public hasmot_cal
{
public:
void su()
{
int a,b;
cout<<"\n \n"<<"enter your Subtraction digit?";
cin>>a>>b;
output=a-b;
cout<<""<<"your Subtraction output = "<<" "<<output<<endl;
}
};

int main()
{
hasmot_cal ajaira;
addition ss;
ss.ad();
Subtraction pp;
pp.su();

return 0;
};

Write a program Check Whether the given number is Strange or Not

//write a program Check Whether the given number is Strange or Not.

#include<iostream>
using namespace std;
//base class
class strange
{
public:
void setdigit(int d)
{
digit=d;
}
protected:
int digit;
};
//derived class
class number : public strange
{
public:
int i,j,t=1,d;
int devide()
{
while(d!=0)
{
j=d%10;
d=d/10;
for(i=2;i<j;i++)
{
if(j%i==0)
{
t=0;
i=j;
}
}
}
}
int check()
{
if(t==1)
cout<<"number is strange";
else
cout<<"number is not strange";
}
};
int main()
{
number hh;
int a;
cin>>a;
hh.setdigit(a);
hh.check();
}

Write a program Whether the given Check Perfect Number

//write a program  Whether the given  Check Perfect Number .

#include<iostream>
using namespace std;

int main(){
    int n,i=1,sum=0;
    cout << "Enter a number: ";
    cin >> n;
       while(i<n){
       if(n%i==0)
       sum=sum+i;
       i++;
}

if(sum==n)
    cout << i << " is a perfect number\n";
else
    cout << i << " is not a perfect number\n";


return 0;

}

Write a program to calculate simple interest amount use default value for rate

// write a program to calculate simple interest amount use default value for rate
#include<iostream>
using namespace std;
class interest
{
int period;
float rate;
float principle;
public:
void get()
{
cout<<"Enter principle Amount: ";
cin>>principle;
cout<<"--------------------"<<'\n';
cout<<"Enter no. of period: ";
cin>>period;
cout<<"--------------------"<<'\n';
}
void cal(float rate)
{
float calculation;
calculation=(principle*period*rate)/100;
cout<<"Simple Interest is: "<<calculation<<'\n'<<'\n';
cout<<"--------------------"<<'\n';
}
};
main()
{
interest b;

b.get();
b.cal(3.8);
return 0;
}

Write a program calculator in Memberfunction

//Write a program calculator using by Memberfunction

#include<iostream>
using namespace std;
class hasmot{
int a,b;
public:

void input()
 {
  cout<<"please enter your digit?";
  cin>>a>>b;
 }

void addition()
{
cout<<"\n \n"<<"enter your addition number?";
cout<<"\n \n"<<"Your addition outpur ="<<a+b<<endl;
}

void subition()
{
cout<<"\n \n"<<"enter your subition number?";
cout<<"\n \n"<<"Your subition outpur ="<<a-b<<endl;
}


void multipution()
{
cout<<"\n \n"<<"enter your multipution number?";
cout<<"\n \n"<<"Your multipution outpur ="<<a*b<<endl;

}

void divied()
{
cout<<"\n \n"<<"enter your divied number?";
cout<<"\n \n"<<"Your divied outpur ="<<a/b<<endl;
}
};


int main()
{
hasmot h;
h.input();
h.addition();
h.subition();
h.multipution();
h.divied();
return 0;

}

Basic Structure of a program

The best way to learn a programming language is by writing programs. Typically, the first program beginners write is a program called "Hello World", which simply prints "Hello World" to your computer screen. Although it is very simple, it contains all the fundamental components C++ programs have==

// my first program in C++
#include <iostream>

using namespace std; 

int main()
{
  cout << "Hello World!";
}

 Output: Hello world!

Variables and types

To see what variable declarations look like in action within a program, let's have a look at the entire C++ code of the example about your mental memory proposed at the beginning of this chapter:

// operating with variables

#include <iostream>
using namespace std;

int main ()
{
  // declaring variables:
  int h, s;
  int result;

  // process:
  h = 5;
  s = 2;
  h = h + 1;
  result = h - s;

  // print out the result:
  cout << result;

  // terminate the program:
  return 0;
} 

Output:4 

Operators

For example, let's have a look at the following code - I have included the evolution of the content stored in the variables as comments:

// assignment operator
#include <iostream>
using namespace std;
int main ()
{
  int a, b;         // a:?,  b:?
  a = 10;           // a:10, b:?
  b = 4;            // a:10, b:4
  a = b;            // a:4,  b:4
  b = 7;            // a:4,  b:7

  cout << "a:";
  cout << a;
  cout << " b:";
  cout << b;
} 

Output:a:4 b:7 

Basic Input/Output

For Example one Input output::

// h/s example #include <iostream> using namespace std; int main () { int h; cout << "Please enter an integer value: "; cin >> h; cout << "The value you entered is " << h; cout << " and its double is " << h*2 << ".\n"; return 0; }

	Output: Please enter an integer value: 702 The value you entered is 702 and its double is 1404.