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    • Postfix

      Postfix

      The sum of X and Y is written as X+Y where + is the operator while X and Y are the operands. We have always learnt to write the sum of two numbers as X + Y; this notation is know as infix. Here, we’ll be talking about the postfix notation of representing arithmetic operations.

    • Uninstall Java

      Uninstall Java

      Computer users sometimes need to uninstall Java, for various reasons. In case of upgrading Java, you needn’t remove the previous version of Java. Instead, you can simply run the executable of the newer Java version and the upgrade will automatically happen. However if you wish to uninstall Java, below are the methods for different platforms.

    • Java Method

      Java Method

      Java Method is very much similar to a normal method or a function written within a class definition. Java method is basically a set of statements group together to perform a specific task. This method is included in a class. An object instantiated from a class can call methods of that class. Every Java method

    • Binary Tree – Searching a Node

      Binary Tree – Searching a Node

      An element in a binary search tree can be searched very quickly. A search operation on binary tree is similar to applying binary search technique to a sorted linear array. The element to be searched will be first compared with root node. If it matches with the root node then the search terminates. Otherwise search

    • Type Conversion – Basic to Class Type

      Type Conversion – Basic to Class Type

      The conversion from basic to user defined data types can be done using constructors. Consider the following constructor: .cf { font-family: Lucida Console; font-size: 9pt; color: black; background: white; } .cl { margin: 0px; } .cb1 { color: green; } .cb2 { color: blue; } .cb3 { color: maroon; }   String :: String(char *a)

    • SQL Injection Attack / Vulnerability

      SQL Injection Attack / Vulnerability

      A SQL injection vulnerability can occur when a poorly-written program uses user-provided data in a database query without first validating the input. This is most-often found within web pages with dynamic content. There are some excellent tutorials and descriptive articles on this subject, as well as many vulnerability postings for different applications from full-disclosure websites.

    • Race Condition

      Race Condition

      A race condition occurs when multiple processes access and manipulate the same data concurrently, and the outcome of the execution depends on the particular order in which the access takes place. A race condition is of interest to a hacker when the race condition can be utilized to gain privileged system access. Consider the following

    • What is PLC Programming?

      What is PLC Programming?

      PLC (Programmable Logic Controller) programming allows a computer to automate mechanical or electrical processes for machinery, lighting, or assembly line control actions. Over the past two decades, PLC programming has been used in a number of industries. The PLC’s design allows it to take multiple inputs and provide various outputs. A PLC device is also

    • JNI (Java Native Interface)

      JNI (Java Native Interface)

      The JNI (Java Native Interface) is a layer of Java that permits code executing or running in the JVM (Java Virtual Machine) to invoke and to be called by native libraries and applications written in other languages. The JNI is most commonly used with the C++, C, and Assembly programming languages. Typically, code developers will

    • Overloading Binary Operators

      Overloading Binary Operators

      Binary operators can be overloaded in a similar manner as unary operators. We should note the following features of an operator function for a binary operator: It receives only one class type argument explicitly, in case of a member function. For a friend function, two class types are received as arguments. It returns a class

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