Constructor.

Write a C++ program to calculate prime number using Constructor.

Program Algorithm:

Step 1: Include the header files

Step 2: Declare the class as Prime with data members and Member functions.

Step 3: Consider the argument constructor Prime () with integer Argument.

Step 4: To cal the function calculate () and do the following steps.

Step 5: For i=2 to a/2 do

Step 6: Check if a%i==0 then set k=0 and break.

Step 7: Else set k value as 1.

Step 8: Increment the value i as 1.

Step 9: Check whether the k value is 1 or 0.

Step 10: If it is 1 then display the value is a prime number.

Step 11: Else display the value is not prime.

Program Code in C++:

#include <iostream.h>

#include<conio.h>

using namespace std;

#include<iostream.h>

#include<conio.h>

using namespace std;

class prime

{

int a,k,i;

public:

prime(int x)

{

a=x;

}

void calculate()

{

k=1;

{

for(i=2;i<=a/2;i++)

if(a%i==0)

{

k=0;

break;

}

else

{

k=1;

}

}

}

void show()

{

if(k==1)

cout<<"\n"<<a<<" is Prime Number.";

else

cout<<"\n"<<a<<" is Not Prime Numbers.";

}

};

int main()

{

int a;

cout<<"Enter the Number:";

cin>>a;

prime obj(a);

obj.calculate();

obj.show();

getch();

return 0;

}

Program Output:

Enter the Number: 10

10 is Not Prime Numbers.

Enter the Number:7

7 is Prime Number.