C++ Memory Management, Data Structures, and Recursion
Dynamic Memory Allocation in C++
Dynamic Memory: Use the new keyword to allocate memory on the heap. It returns the address of the allocated memory. Note: For dynamic arrays, use delete[]. Note: When dynamic arrays store pointers to dynamically allocated objects, you need to delete each element before freeing the array itself.
Common Memory Issues
- Memory Leak: Forgetting to free memory allocated with
new. - Orphaned Memory: Losing the address of allocated memory.
- Double Free: Attempting to free memory
Optimization Techniques for the Sincos Function in R
Analyzing the Sincos Function
getwd()rm(list=ls())
sincos <- function(x){
sol<-sin(x[1]) + cos(x[2])
return(sol)
}
Creating a Vector and Matrix
We create a vector x with values from -3π to 3π in steps of 3π/100 using the seq command.
x<-seq(-3*pi,3*pi, by = 3*pi/100)
Next, we create a matrix m with 2 columns and a number of rows equal to the length of the vector x.
m<-matrix( nrow = length(x), ncol = 2)
m[,1]<-x
m[,2]<-x
Each row of matrix m represents a point in 2D space.
Calculating
Read MoreJava Polymorphism, Abstract Classes, Interfaces, and Threads
Polymorphism in Java
Polymorphism is the ability of an object to take on many forms. Any Java object that can pass more than one IS-A test is considered to be polymorphic.
- Supertype: A class or interface is a supertype relative to another type if its corresponding class or interface has been extended or implemented directly or indirectly by the class or interface of the other type.
- Subtype: A class or interface is a subtype relative to another type if its corresponding class or interface is directly
Modular Design and Data Structures in Software Development
Immediate Objectives
Modular Decomposition, Design, Decision Algorithms, and Basic Data Structures
Modular Decomposition: Depending on what we mean by module, we have the following classifications:
- Source: This is regarded as the most frequent and contains the source text writing.
- Data Table: Used to tabulate certain initialization data that are experimental or difficult to obtain.
- Configuration: We have put together in a single module all the information that can set the specific working environment.
Windows OS: Troubleshooting and Maintenance FAQ
- Which of the following is a correct command to display the version number of the system?
- a) CLS.
- b) Time.
- c) Date.
- d) Ver.
- In the Manage application software in Windows Vista, we have the option of having the software installed. Which of the following is what we run?
- a) Uninstalling.
- b) Reparations.
- c) Amended.
- d) All of the above.
- If the hard drive is less than 512 MB, which format can I use?
- a) FAT.
- b) FAT32.
- c) NTFS.
- d) All of the above.
- The Managing application software in Windows Vista has the option to view
Java Programming: Key Concepts and Features
Java: An Object-Oriented Programming Language
Java is an Object-Oriented programming language developed by James Gosling in the early 1990s. The team initiated this project to develop a language for digital devices such as set-top boxes, television, etc. James Gosling and his team called their project “Greentalk” and its file extension was .gt and later became known as “OAK”. The name Oak was used by Gosling after an oak tree that remained outside his office. The Java language has experienced
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