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SPL(Structured Process Language) A programming language specially for structured data computing.

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package com.scudata.expression.fn.math;

import com.scudata.common.MessageManager;
import com.scudata.common.RQException;
import com.scudata.dm.Context;
import com.scudata.expression.Function;
import com.scudata.expression.IParam;
import com.scudata.resources.EngineMessage;
import com.scudata.util.Variant;


/**
 * ???????,??n????????ѡ??k??????????????nn/2){
			for(long i=n;i>k;i--){
				result*=i;
			}
			result/=Fact.fact(n-k);
		}else{
			for(long i=n;i>n-k;i--){
				result*=i;
			}
			result/=Fact.fact(k);
		}
		return result;
	}
}