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### Simple Program for Constructor Using C++ Programming

C++ Simple Example Programs For Beginners

This Example Programs Calculate Prime Number Using Constructor

## ALGORITHM:

STEP 1:  Start the program.
STEP 2:  Declare the class as Prime with data members,
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.
STEP 12:Stop the program.

## C++ PROGRAM:

`#include<iostream.h>`
`#include<conio.h>`
`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\tA is prime Number. ";`
`                else`
`                  cout<<"\n\tA is Not prime.";`
`              }`
`};`
` `
`void main()`
`{`
`    clrscr();`
`    int a;`
`    cout<<"\n\tEnter the Number:";`
`    cin>>a;`
`    prime obj(a);`
`    obj.calculate();`
`    obj.show();`
`    getch();`
`}`

## Sample Output:

Enter the number: 7
Given number is Prime Number