void test_integ()
{
	// Point to currently active worksheet
	Worksheet wks = Project.ActiveLayer();
	if( !wks ) return;
	
	// Take first two cols and use for data curve
	Curve crvData(wks, 0 , 1);
	// Use 3rd to place Y for output curve
	Dataset dsResultCurve(wks, 2);	
	if( !crvData || !dsResultCurve ) return;
	// Set output col length same as input curve length
	dsResultCurve.SetSize(crvData.GetSize());
	
	// Declare structure to hold integration result and call function to integrate
	IntegrationResult irResult;	
	bool bRet = Curve_integrate(&crvData, &irResult, NULL, &dsResultCurve);
	if( !bRet ) printf("error!");
	
	// Integrated curve will be in 3rd col
	// To see result values such as area, can do the following:
	Tree trResult;
	trResult = irResult;
	out_tree(trResult);
}