C++

One: and are not the same, the former has no suffix, in fact, in your compiler include folder you can see that the two are two files, open the file will find that the code inside is not the same. The C + + standard for the header file suffix. h

When we open bottles and jars, we often encounter the embarrassment of finding the right tool because of different bottle sizes. So sometimes in order to open a bottle, home to prepare a variety of bottle opener. Also open a bottle, why so

In C #, the values are changed when called in the secondary function, and changes are also made in the main function The REF keyword causes the argument to be passed by reference. The effect is that when control passes back to the calling method,

I. Code movement The computation that will be calculated in the loop many times, but the result will not change, moves outside the loop. Example: Before optimization: void Lower1 (char *s) { int i; For (I=0;i= ' a ' &&s[i]= ' a ' &&s[i]

Statistics the number of rows entered The standard library guarantees that the input text stream appears as a row sequence, with each line ending with a newline character. Therefore, the statistic line number is equivalent to counting the number of

Binary files do not hold data in ASCII code, which transmits the form of data stored in memory to disk files without conversion, so it is also known as an image file of memory data. Because the information in the file is not a character data, but a

C + + get () function reads a characterThe Get () function is a member function of a CIN input stream object, which has 3 forms: No parameters, one parameter, and 3 parameters.1 Get function without parametersIts invocation is in the form of

C + + inheritance and combination of detailed explanationWe know that in a class you can use a class object as a data member, a child object (see: C + + A constructor for a derived class that has child objects). In fact, the type of an object member

Introduction of FriendsWe know that the member functions of a class can access other member functions of the same kind, including public, private, and protected members. The external function of a class can only access the public members of the

The importance of proper memory managementC and C + + programs that have memory errors can cause various problems. If they leak memory, the running speed slows down and eventually stops running, and if memory is overwritten, it becomes very

C + + dynamic allocation of memory (new) and undo memory (Delete)In the process of software development, it is often necessary to dynamically allocate and undo memory space, such as inserting and deleting nodes in dynamic lists. The C language uses

Pointers and references form a good distinction, but they seem to have the same function, can directly refer to the object, direct action. But when do you use pointers? When do you use references? The two are easy to confuse, here I give a detailed

C language Truncate () function: Change file sizeheader file: #include To define a function: int truncate (const char * path, off_t length); Function Description: Truncate () changes the file size specified by the

1. malloc () function1.1 malloc's full name is the memory allocation, Chinese called dynamic memory allocation.Prototype: extern void *malloc (unsigned int num_bytes);Description: Allocates a block of memory with a length of num_bytes bytes. If the

C language Tan () function: tangent functionheader file: #include The tan () function is used to find the tangent of a given value, and its prototype is: Double tan (double x); The "parameter" x is the given radian

C language Isupper () function: To determine whether the character is uppercase English lettersheader file: #include To define a function: int isupper (int c); Function Description: Check whether the parameter C is an

C language STRCHR () function: Find out where a character first appears in a string Header files: #include STRCHR () is used to find the first occurrence of a character in a string, and its prototype is: char * STRCHR (const char *STR,

Today to introduce another common management system-book management system, I hope we can hands-on practice, the following to share with you the fruits of my labor. Book information includes: Login number, title, author name, category number,

Topic Topic Description:Converts the number X of M into the number output of N.Input:The first line entered consists of two integers: M and N (2The following line enters a number of x,x that is M, and now requires that you convert the M-ary number

The usual function callsAn example of a common function call: Contains the header file void myfun (int x) itself;//This statement can also be written as: void myfun (int); int main (int argc, char* argv[]) { myfun (10);//Here is call