update readme file.

README.md

@@ -4,18 +4,63 @@ Cpi is a tiny interpreter for C++11 code.
 
 ## Requirements
  - Qt qmake build system
- - g++ compiler
+ - Compiler - g++, clang++, Visual C++ compiler
 
 ## Install
 
     $ qmake
     $ make
     $ sudo make install
 
-## Run
+
+## Run Mode
+Save C++ source code as 'hello.cpp'.
+
+    int main()
+    {
+        std::cout << "Hello world\n";
+        return 0;
+    }
+
+
+Run cpi in command line.
+
+    $ cpi hello.cpp
+    Hello world
+
+Immediately compiled and executed!
+
+Specify options for compiler or linker with "CompileOptions: " word.
+
+    #include <iostream>
+    #include <cmath>
+    #include <cstdlib>
+    using namespace std;
+
+    int main(int argc, char *argv[])
+    {
+        if (argc != 2) return 0;
+
+        cout << sqrt(atoi(argv[1])) << endl;
+        return 0;
+    }
+    // CompileOptions: -lm
+
+In this example, math library specified by "-lm" option.
+
+    $ cpi sqrt.cpp 2
+    1.41421
+
+    $ cpi sqrt.cpp 3
+    1.7320
+
+## Interactive Mode
 
     $ cpi
+    Cpi 2.0.0
+    Type ".help" for more information.
     Loaded INI file: /home/foo/.config/cpi/cpi.conf
+
     cpi>  3 << 23;        (Bitwise operation)
     25165824
 

main.cpp

@@ -10,6 +10,9 @@
 # include <csignal>
 #endif
 
+#define CPI_VERSION_STR "2.0.0"
+#define CPI_VERSION_NUMBER 0x020000
+
 #ifdef Q_CC_MSVC
 # define DEFAULT_CONFIG                                         \
     "[General]\n"                                               \
@@ -184,6 +187,8 @@ static void showCode()
 
 static int interpreter()
 {
+    print() << "Cpi " << CPI_VERSION_STR << endl;
+    print() << "Type \".help\" for more information." << endl;
     print() << "Loaded INI file: " << conf->fileName() << endl;
     print().flush();
     Compiler compiler;