//文件分析，篩選出有用的頻率對
#ifndef FileAnalysis_H
#define FileAnalysis_H
void FileAnalysis(FreqPair*letter_in_use,int &count){
 	ifstream fin("inputfile1.txt");
	FreqPair *letter;
	letter=new FreqPair[128];
	for(int i=0;i<128;i++){
    	letter[i].val()=char(i);
		letter[i].weight()=0;
	}
	char chval;
	int iweight;
	while(!fin.eof()){
		 fin.get(chval);
		 iweight=int(chval);
		 letter[iweight].weight()++;
	}
	fin.close();
	for (i=0;i<128;i++)
	{
		if(letter[i].weight()!=0){
			letter_in_use[count++]=letter[i];
		}
	}
	delete []letter;
//	delete (letter_in_use+count);
};
#endif