Friday November 22, 2013
Today was our finall day of labs and we had to send our fives last programs. To me, they were the most dificult of all. I spent a lot of time working on the problem four. That problem was the most I liked of all, because it was very similar to the software that the library utilizes. I do not had the time to finish all fives problems but at least I could send three of them.
lunes, 25 de noviembre de 2013
Wednesday November 20, 2013
Today we have almost 3 hours of lectures and some of the things that we discuss were the final of chapter 8 and started discussing chapter nine. We discuss in chapter eigth about vectors that are like arrays that can change size, how can we declare it and how we can use them in our sourcescodes. But in order to use them we need to include the library of vectors that is #include <vector>. We ended the chapter discusing about controlling vector capacity and later on we starter discusing the basics about pointers. How can we utilizes, what is a pointer, what is the purpose of a pointer and how we can trackt it alongside with our code.
Today we have almost 3 hours of lectures and some of the things that we discuss were the final of chapter 8 and started discussing chapter nine. We discuss in chapter eigth about vectors that are like arrays that can change size, how can we declare it and how we can use them in our sourcescodes. But in order to use them we need to include the library of vectors that is #include <vector>. We ended the chapter discusing about controlling vector capacity and later on we starter discusing the basics about pointers. How can we utilizes, what is a pointer, what is the purpose of a pointer and how we can trackt it alongside with our code.
Friday November 15, 2013
One of the things we discuss in class today was the ignore. That is a member of the istream class and it can be utilize to read and eliminated all characters. But it takes two arguments: The first oe is the maximum number of characters to discard and the second is the character that stops reading and discarding. Also I learn that comparison operators also can work with string objects = = and returns true if two string objects contain the same characters in the same order. We can also transforms strings in c++ to c-trings.
One of the things we discuss in class today was the ignore. That is a member of the istream class and it can be utilize to read and eliminated all characters. But it takes two arguments: The first oe is the maximum number of characters to discard and the second is the character that stops reading and discarding. Also I learn that comparison operators also can work with string objects = = and returns true if two string objects contain the same characters in the same order. We can also transforms strings in c++ to c-trings.
Wednesday November 13, 2013
We started to see the that the variables of type string can be assigned with the = operator to assigned them a string of words. But the constructor initializes the string to the empty string if you donot initialize the variable when you declare it. We also recall that the cin skips the whitespace to find what it is to read then stops reading and the versions of getline stop reading at the end of line marker. Later all we ended with the lacture and I started workin with my lab 7.
We started to see the that the variables of type string can be assigned with the = operator to assigned them a string of words. But the constructor initializes the string to the empty string if you donot initialize the variable when you declare it. We also recall that the cin skips the whitespace to find what it is to read then stops reading and the versions of getline stop reading at the end of line marker. Later all we ended with the lacture and I started workin with my lab 7.
Microsoft updates C++ compiler
Update lets Visual Studio support some aspects of C++11
By Joab Jackson
November 5, 2012 12:15 PM ET
1 Comment
IDG News Service - Microsoft is updating its C++ compiler for its Visual Studio 12 integrated development environment, or IDE, so that Windows application developers can use parts of the latest version of the programming language, C++11.
Friday afternoon, Herb Sutter, secretary of the ISO/ANSI C++ Standards Committee as well as a Microsoft platform evangelist, announced the release of the new batch compiler during a talk about the future of the language at the Microsoft Build conference, held in Redmond, Washington,
The company has released a compiler CTP (community technology preview) that supports some of the features in the latest C++, including variadic templates, uniform initialization and initializer_lists, delegating constructors, raw string literals, explicit conversion operators and default template arguments for function templates.
The release is the first of what will be a series of "out-of-band" releases, which periodically update the Visual Studio IDE with new features in between major releases, Sutter said. Microsoft will release additional C++ functionality in early 2013 in future out-of-band updates, Sutter said.
The CTP requires Microsoft Visual Studio 12 to run, though it can be run in a free version of the IDE, Desktop Express. Visual Studio 2012 built-in tools, such as Intellisense, debugger and static analysis do not yet support the new C++ features.
"We updated the batch compiler [but] the standard library has not been yet updated, so some of the new features that the standard library could use haven't been lit up yet," Sutter said. "That's just for the CTP. When we ship it, all those features will be in place."
Sutter said that while Microsoft CTPs tend to be pretty stable, it would not be advisable to use the compiler to produce production-ready programs.
As Sutter noted during his talk, there has been a lot of activity around the programming language of late. Microsoft, Intel, Google, IBM and other members of the C++ Committee have formed the Standard C++ Foundation, which will provide educational materials and encourage the correct use of C++ across different compilers.
The standard group has also commenced work on the next generation of the C++ language, C++17, due in 2017.
Developed in Bjarne Stroustrup in 1979, C++ brought object oriented features to the C programming language. It remains one of the most widely used programming languages, and is often used for large scale applications where performance is a critical factor. "We are built on C++, just as the whole industry runs on C and C++," Sutter said, referring to how much of Microsoft's latest operating systems, Windows 8 and Windows RT, was written in C++.
Joab Jackson covers enterprise software and general technology breaking news for The IDG News Service. Follow Joab on Twitter at @Joab_Jackson. Joab's e-mail address is Joab_Jackson@idg.com
- Low Level Languages:-
2. It is difficult to learn and use.
3. It is machine dependent
4. It does not provide built in functions.
5. Program written in low level language is faster in execution.
6. Deep knowledge of hardware is required to learn and use low level languages.
7. There are few programmers that can write programs in low level languages.
8. It is difficult to trace out errors in the programs written in low level language.
9. Low level languages are not commonly used.
10. The program statement written in low level language is very lengthy.
- High Level Languages:-
2. It is easy to learn and use.
3. It is not machine dependent.
4. It provides large number of built in functions.
5. Program written in high level language is slower in execution.
6. No deep knowledge is required to learn and use high level language.
7. There are many programmers that can write programs in high level language.
8. It is easy t trace out errors in the program written in high level language.
9. High level languages are commonly used.
10. The program statement written in high level language is very short.
Lower Level Languages and Higher Level Languages
Generally speaking higher level programming languages are closer to human spoken languages and lower level programming languages are closer to machine code, or binary. However this classification might not always be so clear. C++ is one language that some might argue challenge this programming language stereo type. C++ is a programming language that has all the features that one would expect from a higher level language such as an easy to read syntax, object oriented programming and extensive collections of libraries to add to the language's capabilities but also has other features that are not commonly found in higher level languages such as memory management, user defined operator overloading, six different integer datatypes and a plethora of compilers to choose from. As a result many refer to C++ as a mid-level programming language.For Processing this distinction is currently not so difficult to make. Processing is a high level language, meaning it has an easy to read syntax, supports modern day programming concepts such as Object Oriented Programming, has it's own IDE (Integrated Development Environment something we will become more familiar with throughout this guide) and fundamentally it abstracts a lot of machine specific interactions for us making the code more readable for humans.
However, it's worth considering that the terms “higher” and “lower” level programming languages are relative to the time period in which they are used. For example when the programming language C (that C++ is based on) was first introduced in the early 1970's it was considered to be a high level language as it supported such features as expression evaluation and datatyping, both of which are programming concepts common to most modern day programming languages. As technology progresses, new concepts become common place and rapidly replace older more cumbersome programming designs, till we get to the point where there are far less people that would refer to an older language such as C as being a high level language and a lot more people that would refer to it as a low level language, lacking modern abstractions and less direct hardware interactions. Processing might one day, also be subjected to such a topic of discussion.
Following is the C version of a “Hello World” Program:
#include <stdio.h>
int main(void)
{
printf("hello, world\n");
return 0;
}
The level of abstraction that is needed in order for a language to qualify as a higher level programming language does not come without it's penalties. Lower level languages, because they are conceptually closer to machine code are considered to produce more efficient machine readable code, of course this is largely dependent on the programmer creating the code. As mentioned before the greater the level of abstraction of the code, the more stress that is placed on the machine interpreting the code, and subsequently more system resources are required. As a result of this cycle higher level programming languages generally cannot run on systems where resources are limited. Initially, this might not seem like such a big issue to you, but have you ever considered the amount of technology running on limited resources like a television, fridge, GPS, mobile phone, remote-controlled air-conditioner, electronic toys, media players and the list goes on...? In fact if you were to think about it there are not many devices like computer workstations, laptops or computer servers that are designed to have their resources, available to the software that runs on these machines, extended. Yet, even these machines have their limitations.
Ultimately software, whether it is designed with a high level or low level programming language, should always take into consideration the possible limitations of available system resources.
Suscribirse a:
Entradas (Atom)