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一、文件创建
  
   
  
创建prog-2.cc文件
  
   
  
// Written by Ch. Tronche (http://tronche.lri.fr:8000/)// Copyright by the author. This is unmaintained, no-warranty free software.// Please use freely. It is appreciated (but by no means mandatory) to// acknowledge the author's contribution. Thank you.// Started on Thu Jun 26 23:29:03 1997
//// Xlib tutorial: 2nd program
// Make a window appear on the screen and draw a line inside.
// If you don't understand this program, go to
// http://tronche.lri.fr:8000/gui/x/xlib-tutorial/2nd-program-anatomy.html
// #include 
    
  
    
     
    // Every Xlib program must include this
  
     
      
    
      
       
      // I include this to test return values the lazy way
  
       
        
    
        
         
      // So we got the profile for 10 seconds
#define NIL (0)
#define BLACK_COLOR 0x000000
// main {
//   // Open the display
//   Display *dpy = XOpenDisplay(NIL);
//   assert(dpy);
//   // Get some colors
//   int blackColor = BLACK_COLOR;
// }