c# programmer salary

/Apple/desktop/my2.txt"]; [STR writetourl: URL atomically: Yes encoding: nsutf8stringencoding error: Nil]; Or [@ "Jack \ njack" writetofile: @ "/users/Apple/desktop/my.txt" atomically: Yes encoding: nsutf8stringencoding error: Nil] Nsmutablestring Variable string Nsmutablestring * S1 = [nsmutablestring stringwithformat: @ "My age is 10"]; Splice content to the end of S1 [S1 appendstring: @ "11 12"]; Obtain the is range Nsange range = [S1 rangeofstring: @ "is"]; Delete is [S1 deletecharacter

type * * pointer variable nameAssignment: pointer variable name = variable1 intMain ()2 {3 4 intA=Ten;5 //define pointers, point to a6 int*p=A;7 //defines a pointer to a pointer8 int**P2;9 //assigning values to P2Tenp2=p; One A //use the pointer to a to change the value of a -*p= -; -printf"p Change: a=%d\n", a); the //change the value of a by pointing to the pointer pointer -* (*P2) = -;//*p2 refers to pointer p, and then plus * is equivalent to using t

same data type, You cannot add different types of data to an array.Define array: type character array name [constant expression] (note: Constant expressions can be constants only and cannot contain variables when defined)Eg:int Str[6] = {3,5,6,7,7,8};(2) structure (struct): C language allows users to build their own data structure composed of different types of data, is the structure of the body.When defining a struct, you first need to define the ty

many bytes of memory does the pointer variable occupy? Since pointer variables can point to a variety of different types of data, will they occupy a different space?In fact, to clarify the nature of the pointer, there will be no doubt about it. Pointer variable holds an address, all the addresses in memory must be the same format, so, regardless of the pointer to what type of variable, its nature or to store an address, since all is an address, then everyone must be the same size, so in the sam

------Java Training, Android training, iOS training,. NET training, look forward to communicating with you! -------First,C language learning in the heavy difficulties 1) Operator: self-increment, self-reduction; 2) into the system: a variety of conversion, the original code, anti-code, complement;3) Arrays: one-dimensional arrays, two-dimensional arrays, multidimensional arrays;4) Loop: nesting, sorting, finding of multiple loops;5) Function: recursi

.int1> long int, long:8 bytes%ld2> short int, short:2 bytes%d%i3> unsigned int, unsigned:4 bytes%zd4> signed int, signed, Int:4 byte%d%i2.float\double1> Float:4 bytes%f2> Double:8 bytes%f3.char1> 1 bytes%c%dThe 2> char type is stored in memory with its ASCII value' A '-65Ii. Types of construction1. Arrays1> can only be made up of the same type of data2> definition: Data type array name [number of elements];2. Structural body1> can be made up of differ

variable address 2 //　　 3 scanf ("%d,%d", a,b); // quotation mark How to write the input when you write a space, you can use tab and enter　　 　　　　　　　　　　　　　　　 　　　Although have already learned C language, but this again let me pick up a lot of knowledge points, learn the time to feel skilled, often will be small details of small principles to ignore, will only use do not know how the situation also occurred, before remember the note lost, but

Programmer --- C language details 2Main Content: ";" indicates details, symbol priority, and break; # Include /* The simplest C language program is main () {}. Note that some development environments may not be able to run this way. In cfree, it is said that the program is not properly positioned, in linux, if gcc is used for compilation and running, an int

storage means, for a multi-byte data, its low position in the lower address unit, its high position in the higher address unit. For example, an int type of data ox12345678, if stored in the 0x00000000,0x00000001,0x00000002,0x00000003 four memory units, then ox00000000 is placed in the Low ox78, and ox00000003 in the high 0x12, and so on. With the above understanding, we can continue to analyze why the above program output FFFFFFF7: char* b = (char*) a; What did you do? As a matter of

I have published an article titled how to learn a new language. Later, I began to learn python. The specific reason is not very clear. I started with a concise Python tutorial and wrote two notes, "Python first experience 1" and "Python first experience 2", but I didn't feel much about it. Later, I wanted to try Python because of a small project. In this process, I experienced the simplicity and efficiency of Python and a flying feeling-maybe I am a C

= dict[@"age"];14 15 16 int a = [num2 intValue];17 18 NSLog(@"%d" , a);19 } 1 # import 2. nsvalue usage: Nsnumber can wrap the basic data type as an object because it inherits nsvalue 1 # import 3. The specific nsdate usage code is as follows: 1 void use () 2 {3 // create a time object 4 nsdate * Date = [nsdate date]; 5 // print out the time zone 0 (Beijing-East 8) 6 nslog (@ "% @", date ); 7 8 nsdate * date2 = [nsdate datewithtimeinterval: 5 sincedate: date]; 9 10 11 // n

time;Nsmutablestring can use all methods of NSString. Inheritance3, variable and immutable concepts:Immutable: Refers to a string in memory occupied by the storage space fixed, and the contents of the storage can not be changed;Variable: Refers to a string in memory occupied by the storage space can be fixed, and the stored content can be modified;4, using:nsmutablestring *STR2 = [nsmutablestring stringwithformat:@ "Jack"];1), add: [str2 appendstring:@ "rose"];//append

cannot be accessed by an external file. extern: Indicates that this variable can be accessed by an external file. Effect on local variables: Static:1> extends the period of the variable and does not disappear as the function is destroyed. 2> extends the scope of variables.* (p++) and * (++P) are the same.Not the same. * (p++): First take the value of *p, then P plus 1* (++p): first P plus 1, then take *p 23. Why do I need a pointer variable type? Because each pointer variable may po

; Break In fact, this is wrong, because if a new variable is defined in the case, it must be wrapped with {} or the variable scope is ambiguous. The correct wording should be: int a = 0 ; switch (a) { case 0 : { int b=1 ; break ; default : { int b=2 ; break ; }} Oh, that's right. In fact, switch in the default is often ignored, when all cases of the value is not equal to a, you can use the default!5. It should also be noted that the I

. Multi-line libraries –pthreads, BOOST Libraryhttps://computing.llnl.gov/tutorials/pthreads/http://ashishgrover.com/boost-multi-threadingfor-c/9. Memory Tool –purify, ValgrindHttp://www.cprogramming.com/debugging/valgrind.htmlHttp://pages.cs.wisc.edu/~hasti/cs368/resources/purify.htmlTen. GUI–QThttp://zetcode.com/gui/qt4/introduction/http://www.digitalfanatics.org/projects/qt_tutorial/Http://doc.trolltech.com/4.3/tutorial.htmlArticle reprinted from:

even a lot of people taboo try-catch-finally, causing exaggerated problems, C # Development of the real problem lies in the current cross-platform aspects.The company's research and development department thinks: if Java developers think that C # developed the program is too slow, certainly not a qualified Java programmer, he wrote the code is sureLow performanc

+ +, C #, Java, objective-c, etc.Iii. Introduction to C language 1. The reason for learning C language first1) OC based on C2) OC and C's thought and grammar are different in many places, and OC can be mixed with C3) c is the classic of all programming languages, many high-

reserved.//#include Functions are also stored in memory, and of course the function has a starting address (in fact the function name is the starting address of the function ), here also need to understand the relationship of function pointers. function pointer definition of the form: return value type (* pointer variable name) (parameter 1, parameter 2), get the function pointer in fact we are the equivalent to get this function, the function of the operation can be done by pointers, And with

Constants and pointersVariables that can be modified after a declaration are declared as constants if they cannot be modified in order to protect the variable, using the const modifier.In C + +, a pointer variable is assigned a 4-byte (32-bit) block of memory to store the address pointing to the data, so the pointer type involves two concepts, the pointer itself (a 4-byte memory block), and a pointer to the data (4 bytes of memory block-stored address

This book is still more targeted, these days can not find any direction, look at this book, and take note of some of the pointsThe 2nd chapter is some. NET Framework concept, usually not in-depth contact, only half-way to see.3rd Chapter1. C # Pre-defined reference types are two: object and string2, value type: Inherit from System.ValueType, not as base class, allocate stack, automatically release after scope end3. Reference type: Inheritable, allocat