How to find an x y z co-ordination in spline?

Development Programming & Scripting C++
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i find that location but it showing some large number of values like( -2147483648, 0, -2147483648 )

SplineComponent->GetLocationAndTangentAtSplinePoint( loopIndex, startLocation, startTangent, ESplineCoordinateSpace::Local);
SplineComponent->GetLocationAndTangentAtSplinePoint(nextLoopIndex, endLocation, endTangent, ESplineCoordinateSpace::Local);
SplineComponent->SetSplinePointType( loopIndex, ESplinePointType::Constant);

Above i have added the Snippet, Please help me to come out of this…

Thanks a lot