brew update error /usr/local must be writable

brew update error /usr/local must be writable
Solved:

1. sudo chmod -R g+w /usr/local

2. brew udate

Terminal mode object C Ex1

Ref:http://www.informit.com/articles/article.aspx?p=1819492
Macbook pro (OS X EI Captian 10.11.5)
Xcode 7.3.1
1. Prepare code (main.m)
//
//  main.m
//  prog1
//
//  Created by Steve Kochan on 7/7/11.
//  Copyright 2011 ClassroomM, Inc.. All rights reserved.
//
// clang -fobjc-arc -framework Foundation main.m -o prog1
// ,/prog1
//
#import <Foundation/Foundation.h>

int main (int argc, const char * argv[]) {
   @autoreleasepool {

      // insert code here...
      NSLog (@"Hello World!");
   }
   return 0;

}
2. Compile

clang -fobjc-arc -framework Foundation main.m ecute-o prog1

3. Execute
./prog1

4. Result

Mac Java Form Hello

ref:http://www.tutorialspoint.com/javaexamples/gui_line.htm

Macbook pro (OS X EI Captian 10.11.5)

java 1.7.0_79

1. Prepare java code by 文字編輯器

// 1. Filename = class name (JavaFormHello.java)

// 2. Prepare java code (filename name.java)

// 3. Command mode

// 3.1 Compile: javac name.java

// 3.2 Execute: java name(.class)

import java.awt.*; 

import java.awt.event.*;

import java.awt.geom.Line2D;

import javax.swing.JApplet;

import javax.swing.JFrame;

public class JavaFormHello extends JApplet {

   public void init() {

      setBackground(Color.white);

      setForeground(Color.white);

   }

   public void paint(Graphics g) {

      Graphics2D g2 = (Graphics2D) g;

      g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,

      RenderingHints.VALUE_ANTIALIAS_ON);

      g2.setPaint(Color.gray);

      int x = 5;

      int y = 7;

      g2.draw(new Line2D.Double(x, y, 200, 200));

      g2.drawString("Line", x, 250);

   }

   public static void main(String s[]) {

      JFrame f = new JFrame("Line");

      f.addWindowListener(new WindowAdapter() {

         public void windowClosing(WindowEvent e) {

            System.exit(0);

         }

      });

      JApplet applet = new JavaFormHello();  // Becareful the class name

      f.getContentPane().add("Center", applet);

      applet.init();

      f.pack();

      f.setSize(new Dimension(300, 300));

      f.setVisible(true);

   }

}

2. Compile:

javac JavaFormHello.java

3. Execute

java JavaFormHello

4. Result

Mac Java Hello

Ref : http://www.tutorialspoint.com/java/index.htm

Macbook pro (OS X EI Captian 10.11.5)

java 1.7.0_79

1. Prepare java code by 文字編輯器

// 1. Filename = class name

// 2. Prepare java code (filename name.java)

// 3. Command mode

// 3.1 Compile: javac name.java

// 3.2 Execute: java name(.class)

public class JavaHello {

    public static void main(String []args) {

       System.out.println("Hello World");

    }

} 

2. Compile:

javac JavaHello.java

3. Execute

java JavaHello

4. Result

mono VB hello world

ref: http://progopedia.com/implementation/mono-vbnet/

Macbook pro (OS X EI Captian 10.11.5)

mono 4.2.3

1. Prepare VB code by 文字編輯器

‘compile: vbnc  name.vb

‘ exe: mono name.exe

Module Module1

    Sub Main()

        Console.WriteLine("Hello, World!")

    End Sub

End Module 

2. Compile

vbnc name.vb

3. Execute

mono name.exe

4. Result