阅读下列说明，回答问题。 【说明】 逻辑覆盖法是设计白盒测试用例的主要方法之一，通过对程序逻辑结构的遍历实现程序的覆盖。针对以下由C语言编写的程序，按要求回答问题。 int XOR(char * filename, unsigned long key){ FILE * input = NULL , *output = NULL; //1 char * outfilename = NULL; int len = strlen(filename); unsigned char buffer; if( (filename[len-2] == ".") && (filename[len-1] == "c") ) { //2,3 outfilename = new char[len+1]; //4 strcpy(outfilename, filename); outfilename[len-2] = "\0"; } else{ //5 outfilename = new char[len+5]; strcpy(outfilename, filename); strncat(outfilename,".c",2); } input = fopen(filename,"rb"); if( input == NULL) { //6 cout ＜＜ "Error opening file " ＜＜ filename ＜＜ endl; //7 delete [] outfilename; outfilename = NULL; return 1; } output = fopen(outfilename,"wb"); if( output == NULL ) { //8 cout ＜＜ "Error creating output file " ＜＜ outfilename ＜＜ endl; //9 delete [] outfilename; outfilename = NULL; return 1; } while( ! feof(input) ) { //10 if( fread(&buffer,sizeof(unsigned char),1,input) != 1 ) { //11 if( ! feof(input) ) { //12 delete [] outfilename; //13 outfilename = NULL; fclose(input); fclose(output); return 1; } } else{ //14 buffer ^= key; fwrite(&buffer, sizeof(unsigned char),1,output); } } fclose(input); //15 fclose(output); delete [] outfilename; return 0; }4.1、请给出满足100%DC(判定覆盖)所需的逻辑条件。(3分)4.2、请画出上述程序的控制流图，并计算其控制流图的环路复杂度V(G)。(7分)4.3、请给出问题2中控制流图的线性无关路径。(5分)

阅读下列说明，回答问题。  【说明】  逻辑覆盖法是设计白盒测试用例的主要方法之一，通过对程序逻辑结构的遍历实现程序的覆盖。针对以下由C语言编写的程序，按要求回答问题。  int XOR(char * filename, unsigned long key){    FILE * input = NULL , *output = NULL;   //1    char * outfilename = NULL;    int len = strlen(filename);    unsigned char buffer;    if( (filename[len-2] == ".") && (filename[len-1] == "c") ) { //2,3    	outfilename = new char[len+1];   //4    	strcpy(outfilename, filename);    	outfilename[len-2] = "\0";    }    else{   //5    	outfilename = new char[len+5];    	strcpy(outfilename, filename);    	strncat(outfilename,".c",2);    }    input = fopen(filename,"rb");    if( input == NULL) {   //6    	cout ＜＜ "Error opening file " ＜＜ filename ＜＜ endl;   //7    	delete [] outfilename;    	outfilename = NULL;    	return 1;    }    output = fopen(outfilename,"wb");    if( output == NULL ) {   //8    	cout ＜＜ "Error creating output file " ＜＜ outfilename ＜＜ endl;	//9    	delete [] outfilename;    	outfilename = NULL;    	return 1;    }    while( ! feof(input) ) {   //10    	if( fread(&buffer,sizeof(unsigned char),1,input) != 1 ) {   //11    	if( ! feof(input) ) {   //12    	delete [] outfilename;   //13    	outfilename = NULL;    	fclose(input);    	fclose(output);    	return 1;    	}    	}    	else{   //14    	buffer ^= key;    	fwrite(&buffer, sizeof(unsigned char),1,output);    	}    }    fclose(input);   //15    fclose(output);    delete [] outfilename;    return 0;   }4.1、请给出满足100%DC(判定覆盖)所需的逻辑条件。(3分)4.2、请画出上述程序的控制流图，并计算其控制流图的环路复杂度V(G)。(7分)4.3、请给出问题2中控制流图的线性无关路径。(5分)