C++PrimerPlus第十七章课后编程练习题 .pdfVIP

C++PrimerPlus第⼗七章课后编程练习题 1题 #include iostream int main() { using namespace std; long num = 0; char ch; cout “请输⼊⼀些字符:\n”; cin.get(ch); cout 字符前边的字符是 :;while(ch!=′$’) { cout ch; num++; cin.get(ch); } 1 cout \n$前有 num 个字符\n; 2 cout 输⼊流中还有这些字符: ; 3 while (ch != \n) 4 { 5 cout ch; 6 cin.get(ch); 7 } 8 cout .\n; 9 return 0; } ///2题/// #include iostream #include fstream #include cstdlib int main(int argc, char * argv[]) { using namespace std; char ch; if (argc == 1) { cerr “Usage: argv[0] ” filename[s]\n; exit(EXIT_FAILURE); } ofstream fout; fout.open(argv[1]); if (!fout.is_open()) { cerr Could not open argv[1] endl; exit(9); } cout “请输⼊字符串到⽂件” argv[1] “中.(ctrl + d 结束输⼊)\n”; while (cin.get(ch)) fout ch; fout.close(); 1 ifstream fin; 2 cout 查看⽂件 argv[1] 中的内容:\n; 3 fin.open(argv[1]); 4 while (fin.get(ch)) 5 cout ch; 6 fin.close(); 7 return 0; } //3题// #include #include #include int main(int argc, char * argv[]) { using namespace std; char ch; ifstream fin; ofstream fout; if (argc 3) { cerr “命令⾏参数错误！\n”; exit(1); } fin.open(argv[1]); if (!fin.is_open()) { cerr argv[1] “⽂件⽆法打开!\n”; exit(2); } fout.open(argv[2]); if (!fout.is_open()) { cerr argv[2] “⽂件⽆法打开!\n”; exit(3); } while (fin.get(ch)) fout ch; 1 fin.close(); 2 fout.close(); 3 4 cout argv[1] ⽂件的内容有:\n; 5 fin.open(argv[1]); 6 if (!fin.is_open()) 7 { 8 cerr argv[1] ⽂件⽆法打开!\n; 9 exit(4); 10 } 11 while (fin.get(ch)) 12 cout ch; 13 cout endl; 14 cout argv[2] ⽂件现在的内容有:\n; 15 ifstream fin2; 16 fin2.open(argv[2]);