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C++ Program Design
Program organization: install, compile, shared headers, namespaces. "Quiz 2"
| Question | Answer |
|---|---|
| When should you declare things? | The only rule is to declare things before using them. |
| What is the purpose of a shared header file? | To insure that the declaration and definition of global functions and objects are consistent. They are conventionally inserted with a #include "filename.h" |
| Write a example of using a shared header file. Write out the .h file and two .cpp files. | //prog.h extern int x; int f(); //prog1.cpp #include "prog.h" int x=0; int main() { f(); return 0; } //prog2.cpp include "prog.h" int f() { return x;} |
| How do you compile your program in UNIX and Windows? | g++ file1.cpp -o hello ./hello gxx hello.cpp -o hello.exe >>hello (-o renames the default a.exe to hello.exe) |
| g++ file.cpp | Compile, produce executable a.out in UNIX |
| g++ file1.cpp file2.o | Compile .cpp and link .o to executable in a.out |
| g++ -Wall | Turn on all warnings |
| g++ -c file1.cpp | Compile to file1.o, do not link |
| g++ -O | Optimize executable for speed |
| g++ -v | Verbose mode |
| g++ -DX=Y | Equivalent to #define X Y |
| g++ --help | Show all g++ options |
| gxx file1.cpp | Compile in Windows MS-DOS box (DJGPP) to A.EXE |
| How do you create a library (namespace)? | #define MYLIB_H namespace mylib {...} |
| What is a trick to guard against possible multiple inclusions of the header file? | Test for it with #ifndef ... #endif on the first and last lines of the code. Don't have a using namespace std;. |
| What are three free GNU GCC compiler packages for Windows? | DJGPP MinGW and Cygwin |
| What is MinGW? | A native Windows port of the GNU Compiler Collection (GCC) |
| What is the procedure to install and configure GNU GCC on Windows? How do you test that you succeeded? | Download MinGW. Install MinGW with C and C++ compilers. Copy the path C:\MinGW\bin to Computer Properties, Advanced System Settings, Environment Variables, Path, Variable Value type a ";" at the end of the string, paste it. Type gcc into the cmd screen. |
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themagicdwarf
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