Objective: Write a simple program to demonstrate while loop and compute the summ

Question

Objective: Write a simple program to demonstrate while loop and compute the summation. The main purpose of this homework is to review the understanding of for while loop.

Problem: Using C++, write a program with 1 while loop to print out the numbers and summation. The iteration number is read directly from command line, e.g., ./executable iteration.

Output:

In this example, I use 5 for WHILE LOOP

Assume the executable file is called solution, then your program should be executed as ./solution 5

The screen should show

1

2

3

4

5

Summation is: 15

Requirement

- You can choose any positive integer (program will give error or crash if you have negative number) for WHILE LOOP.

- Should give error or crash if argument number is not exactly 2

- To print the summation, e.g., cout << “Summation is: “ << summation << endl; (endl = end of line)

- Enhance understanding for if statement and argument input in C++

Explanation / Answer

#include <iostream>
using namespace std;

int main()
{
   int i,number,summation;
   summation = 0;
   i=1;
   cout<<"Enter the number : "; //input the number
   cin>>number;
  
   cout<<endl;
   while(i<=number) //while loop
   {
   cout<<i<<endl;
   summation = summation + i;
   i++;
   }
  
   cout << "Summation is: "<< summation << endl;
  
   return 0;
}

Output:

Enter the number :
1
2
3
4
5
Summation is: 15

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