hi ,

i need help to complete wrting a program
//

``````#include<iostream>
#include<cmath>

using namespace std;
int main()
{

//decaler data here
double var, n=0,  sum = 0;
double x, xi;

//input
cout << "please enter the value of x :";
cin >> x;
cout << "please enter the value of xi :";
cin >> xi;
//calculations

while (xi > 0) {
cout << "please enter the value of xi :";
cin >> xi;

sum += pow((xi - x), 2);
n++;
}

cout << "the number of observation is :" << n << endl;
cout << "the sum of (xi-x)2 is :" << sum << endl;

//computaion

var = (sum / n);

//output

cout << "the variance is :" << var << endl;

//process

if (var < 10)
{
cout << "the flag vlaue is:" << 'A';
cout << "Excellent observation";
}

else if (var >= 10 && var < 15) {

cout << "the flag vlaue is:" << 'B';
cout << "Normal observation";
}

else if (var >= 15 && var < 20) {
cout << "the flag vlaue is:" << 'C';
cout << "Acceptable observation";
}

else if (var >= 20){
cout << "the flag vlaue is:" << 'D';
cout << "Not acceptable at all";
}

else
cout << "Errors";

system("pause");
return 0;

}
``````

this what i wrote ,
acutely it work well until (the number of observation)
but it give me wrong vlaue for (the sum of (xi-x)2) and (the variance ) !!
also if statement does not work at all ?
help me please :( i should submit the assignment ,

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