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C++ Program Design

Program organization: install, compile, shared headers, namespaces. "Quiz 2"

QuestionAnswer
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.
Created by: themagicdwarf