C++ code problem.

Attached is my code in full text form. The problem is attached as well.

The first loop is supposed to sum from 1 to any number the user enters. This works just fine.

The second is supposed to display the length of an interval entered by the user. But keeps coming to zero.

1 to 9 is 7. (We exclude 1 and 9.)

And the last is supposed to take the product.

3^4 =81

This should be easy but I am just struggling so much right now. Please help.

My code:

#include

using std::endl;

using std::cout;

using std::cin;

//using namespace::std;

int main()

{

// Part (a)

int check = 0, number, answer=0, x1, x2;

int length = 0;

cout << "Please enter an integer: " << endl;

while (check != 0)

system("Pause");

{

cin >> number;

if (number > 0)

{

for (int i = 1; i <= number; i++)

{

answer = answer + i;

}

cout << "The sum of the integers from 1 to " << number << " is "

<< answer << endl;

//break;

}

else

//system("Pause");

{

cout << "Enter a number greater than or equal 1: " << endl;;

}

}

// Part (b)

cout << "Enter two numbers to find the length: " << endl;

cin >> x1 >> x2;

if (x1 < x2)

{

while (++x1 < x1)

{

length++;

}

}

cout << "The length between " << x1 << " and " << x2 << " is: " << length << endl;

check = 0;

// Part(c)

cout << "Enter another pair of numbers to find the product of both: " << endl;

while (check != 0);

{

cin >> x1 >> x2;

if (x2 > 0)

{

if (x2 == 0)

{

answer = 0;

}

else {

answer = x1;

do {

answer = answer ^ x1;

break;

} while (--x2 > 1);

}

}

else {

cout << "Enter the pair without 2nd being negative: " << endl;

}

}

cout << "The product of " << x1 << " and " << x2 << " is: " << answer << endl;

system("Pause");

return 0;

}