Program in C++ to display the n terms of even natural number and their sum

Write a program in C++ to display the n terms of even natural number and their sum.

Flowchart of n terms of even natural number and display their sum

C++ Source Code Of program of displaying the n terms of even natural number and their sum

#include<iostream>
using namespace std;
int main()
{
	int j,num,sum=0;
	cout<<"Input number of terms : ";
	cin>>num;
	cout<<"the even numbers are : ";
	j=1 ;
	do 
	{
		cout<<2*j<<endl;
		sum+=2*j;
		j++;
	}
	while(j<=num);
	cout<<"The sum of numbers up to "<<num<<" terms is: "<<sum;
}

#include<iostream>

using namespace std;

int main()

{

int j,num,sum=0;

cout<<"Input number of terms : ";

cin>>num;

cout<<"the even numbers are : ";

j=1 ;

{

cout<<2*j<<endl;

sum+=2*j;

j++;

}

while(j<=num);

cout<<"The sum of numbers up to "

<<num<<" terms is: "<<sum;

}

Output

Input number of terms: 5

the even numbers are:2

4

6

8

10

The sum of numbers up to 5 terms is: 30

Exercise

Find the possible mistakes in the following Shamil’s Flow Table of the program of displaying the n terms of even natural number and their sum.

Suppose user enter 5

Loop

What lines will execute?

Actual work to do

1 time

J=1

1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17

Sum += 2*j

Sum+=2*1;

Sum+=2

2 time

J=2

1,2,3,4,5,6,7,8,9,(10,11,12,13,14,15,16)²,17

Sum += 2*j

Sum+=2*2;

Sum+=6

3 time

J=3

1,2,3,4,5,6,7,8,9,(10,11,12,13,14,15,16)³,17

6+=6

Sum=12

4 time

J=4

1,2,3,4,5,6,7,8,9,(10,11,12,13,14,15,16)⁴,17

12+=8

Sum=20

5 time

J=5

1,2,3,4,5,6,7,8,9,(10,11,12,13,14,15,16)⁵,17

20+=10

Sum=30

If user enter num =0 loop still loop will execute one time