How to write a c++ program with class?

How to write a C++ program with class?

It’s very simple to write a C++ program with a class. We need to follow the following steps;

It’s very easy to include a class with a C++ main program. Just follow the following steps;

Step 1: Begin with header files.

Step 2: adding the namespace.

Step 3: Declaration and definition of the class.

Step 4: Starting the main function.

Step 5: In the main function, creates the one or many objects of the class as you required.

Step 6: Call the functions of the class in the main function with the help of class objects.

Let’s see it with an example.

Example to write a C++ program with class

Write a program in C++ to find the sum of the series 1 +11 + 111 + 1111 + .. n terms with class.

#include <iostream>
using namespace std;
class abc
{
	public:
		int n;
		int a()
		{
			 cout<<"Input the number of terms : ";
  cin>>n;
  int s=0;
	 int t=1,i=1;
	 for(i=1;i<=n;i++)
  {
  	cout<<" "<<t<<" ";
      if (i<n)
      {
      	cout<<"+";    
      }
     s=s+t;
     t=(t*10)+1;
  }
  cout<<endl<<"The Sum is :"<<s;
}
		
};
int main()
{
	abc e;
	e.a();
}

Write a program in C to convert an Octal number to a Decimal number without using an array, function, and while loop with class.

#include<iostream>
#include<math.h>
using namespace std;

class a
{
	private:
	int decimal_number=0 , remainder, octal_number;
	int count;
	public:
		int input()
		
		{
	cout<<"Enter an octal number:";
	cin>> octal_number;
		}
		int print()
		{
		decimal_number=0;
		for(count=0;octal_number>0;count++)
		{
		remainder = octal_number%10;
		decimal_number = decimal_number+ remainder*pow(8,count);
		octal_number=octal_number/10;
		}
		cout<<"decimal equivalent of"<<decimal_number;
		}
};
int main()
{
	a obj;
	obj.input();
	obj.print();
}

Write a program in C to find the number and sum of all integer between 100 and 200 which are divisible by 9 with class.

//Write a program to find the number and sum of all integer between 100 and 200 which are divisible by 9.

//simple program

#include<iostream>
using namespace  std;
class number
{
	private:
		int i,sum=0;
		public:
			int show_num()
			{
				for(i=101; i<200; i++)
				if(i%9==0)
				{
					cout<<"numbers divisble by 9 is= "<<i<<endl;
					sum=sum+i;
				}
				cout<<"sum of all numbers divisible by 9 is= "<<sum<<endl;
			}
};
int main()
{
	number f;
	f.show_num();
}