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what are "+=" and "-=" ?

takure (5)
can anyone tell me what does "+=" or "-="mean?

for example;
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int main()
{
	int start,end;
	cout << "Enter the boundaries( start, end): ";
	cin >> start >> end;
	
	double sum = 0;

	if (start > end)
		cout << "Start must be smaller than end!" << endl;
	else
	{
		while (start <= end)
		{
			sum += reciprocal(start);   //This one "+="
			start++;
		}
		cout << "Sum of reciprocals: " << sum << endl;
	}
	return 0;
}
Athar (4466)
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