double d = 0;
ValueEval retval = null;
switch (operands.length) {
default:
retval = ErrorEval.VALUE_INVALID;
break;
case 1:
ValueEval ve = singleOperandEvaluate(operands[0], srcRow, srcCol);
if (ve instanceof NumericValueEval) {
NumericValueEval ne = (NumericValueEval) ve;
d = ne.getNumberValue();
}
else if (ve instanceof BlankEval) {
// do nothing
}
else {
retval = ErrorEval.NUM_ERROR;
}
}
if (retval == null) {
d = Math.acos(d);
retval = (Double.isNaN(d))
? (ValueEval) ErrorEval.NUM_ERROR
: new NumberEval(d);
}
return retval;
