答案及解析：[问答题]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

问题：

[问答题] 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 image.pngimage.png "Error opening file " image.pngimage.png filename image.pngimage.png endl; //7 delete [] outfilename; outfilename = NULL; return 1; } output = fopen(outfilename,"wb"); if( output == NULL ) { //8 cout image.pngimage.png "Error creating output file " image.pngimage.png outfilename image.pngimage.png 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。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)。4.3、请给出问题2中控制流图的线性无关路径。

Tags：软件水平考试中级软件评测师试题及答案

答案解析：

╋纠错

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