Write a program in C++ to Check Whether a Number can be Express as Sum of Two Prime Numbers using the constructor overloading and destructor.
C++ Program with constructor to Check Whether a Number can be Express as Sum of Two Prime Numbers
#include<iostream>
using namespace std;
class T4Tutorials
{
protected :
int n, i, num1,num2,num3,j;
public :
T4Tutorials()
{
num1=1,num2=1,num3=0;
cout<<"Check Whether a Number can be Express as Sum of Two Prime Numbers:"<<endl;
cout<<"----\n";
cout<<"Input a positive integer: "<<endl;
cin>>n;
for(i=3; i<=n/2; i++)
{
/*prime number?*/
num1=1;
num2=1;
for(j=2; j<i; j++)
{
if(i%j==0)
{ num1=0;j=i;}
}
for(j=2; j<n-i; j++)
{
if((n-i)%j==0)
{ num2=0;j=n-i;}
}
if(num1==1 && num2==1)
{ printf("%d = %d + %d \n",n,i,n-i);
num3=1;}
}
if(num3==0)
{
cout<<"can not be expressed as sum of two prime numbers."<<endl;
}
}
};
int main()
{
T4Tutorials a;
}
Output
Check Whether a Number can be Express as Sum of Two Prime Numbers:input a positive integer:
5
can not be expressed as sum of two prime numbers.
C++ Program with destructor to Check Whether a Number can be Express as Sum of Two Prime Numbers
#include<iostream>
using namespace std;
class T4Tutorials
{
protected :
int n, i, num1,num2,num3,j;
public :
~T4Tutorials()
{
num1=1,num2=1,num3=0;
cout<<"Input a positive integer: ";
cin>>n;
for(i=3; i<=n/2; i++)
{
/*check for prime number?*/
num1=1;
num2=1;
for(j=2; j<i; j++)
{
if(i%j==0)
{ num1=0;j=i;}
}
for(j=2; j<n-i; j++)
{
if((n-i)%j==0)
{ num2=0;j=n-i;}
}
if(num1==1 && num2==1)
{ printf("%d = %d + %d \n",n,i,n-i);
num3=1;}
}
if(num3==0)
{
cout<<"\n%d can not be expressed as sum of two prime numbers.\n\n";
}
}
};
int main()
{
T4Tutorials a;
}
C++ Program with constructor overloading to Check Whether a Number can be Express as Sum of Two Prime Numbers
#include<iostream>
using namespace std;
class T4Tutorials
{
protected :
int n, i, num1,num2,num3,j;
int flg5,flg6,flg4;
public :
T4Tutorials (int one)
{
num1=1,num2=1,num3=0;
for(i=3; i<=one/2; i++)
{
/*check for prime number?*/
num1=1;
num2=1;
for(j=2; j<i; j++)
{
if(i%j==0)
{ num1=0;j=i;}
}
for(j=2; j<one-i; j++)
{
if((one-i)%j==0)
{ num2=0;j=one-i;}
}
if(num1==1 && num2==1)
{ printf("%d = %d + %d \n",one,i,one-i);
num3=1;}
}
if(num3==0)
{
cout<<one<<"can not be expressed as sum of two prime numbers.\n\n";
}
}
T4Tutorials (int two ,int three)
{
cout<<"Now checking Your input No.1 :"<<two;
cout<<"\n\n";
num1=1,num2=1,num3=0;
for(i=3; i<=two/2; i++)
{
/*---------- check for prime---------------*/
num1=1;
num2=1;
for(j=2; j<i; j++)
{
if(i%j==0)
{ num1=0;j=i;}
}
for(j=2; j<two-i; j++)
{
if((two-i)%j==0)
{ num2=0;j=two-i;}
}
if(num1==1 && num2==1)
{ printf("%d = %d + %d \n",two,i,two-i);
num3=1;}
}
if(num3==0)
{
cout<<two<<" can not be expressed as sum of two prime numbers.\n\n";
}
cout<<"\n\nNow checking Your input No.2 :"<<three;
cout<<"\n\n";
num1=1,num2=1,num3=0;
for(i=3; i<=three/2; i++)
{
/*---------- check for prime---------------*/
flg4=1;
flg5=1;
for(j=2; j<i; j++)
{
if(i%j==0)
{ flg4=0;j=i;}
}
for(j=2; j<three-i; j++)
{
if((three-i)%j==0)
{ flg5=0;j=three-i;}
}
if(flg4==1 && flg5==1)
{ printf("%d = %d + %d \n",three,i,three-i);
flg6=1;}
}
if(flg6==0)
{
cout<<three<<"can not be expressed as sum of two prime numbers.\n\n";
}
}
};
int main()
{
int option;
cout<<"Enter 1 of Single parameter T4Tutorialsor \n";
cout<<"\nEnter 2 For Multiple Paramter constucor \n";
cout<<"\nEnter 1 or 2 : ";
cin>>option;
system("cls"); //this function is to clear the screen
if(option ==1)
{
cout<<"You Have Slected Single Paramater";
cout<<"T4Tutorialsor\n";
int one;
cout<<"Enter number to check : ";
cin>>one;
T4Tutorials a(one);
}
else if(option==2)
{
cout<<"You Have slected Multiple Paramater ";
cout<<"T4Tutorialsor\n";
int two,three;
cout<<"Enter First number to check : ";
cin>>two;
cout<<"\nEnter Second number to check : ";
cin>>three;
T4Tutorials a(two, three);
}
else
{
cout<<"Your Input in Wrong try Agin \n\n\n";
}
}