Summary of several confusing knowledge points in C Language

1. pointer array and array pointer (1) int * q [10]; pointer array, which declares an array pointing to 10 integer pointer elements. (2) int (* p) [10]; array pointer, which declares a pointer pointing to 10 integer arrays. A pointer array is an

Some special usage of C language (# define)

I haven't written a BLOG for a long time. ^_^ If you don't know what to write, write something that is easy to ignore. I. Special string macros [Cpp]# Define A (x) T _ # x# Define B (x) # @ x# Define C (x) # x Assume that x = 1, the macro

Detailed description of the set function in STL

Insert the set element: # Include # Include # Include Using namespace std;Void printSet (set s){// Copy (s. begin (), s. end (), ostream_iterator (cout ,","));Int I;For (I = s. begin (); I> = s. end (); I ++) Cout }Void main (){// Create an empty

Key Points of C Language

One keyword: 1. static: The first role is to modify the variable. Variables are classified into local and global variables, but they all have static memory areas. Because static modified variables always exist in the static memory zone, the value of

Forced conversion of data of type P and N to type C

The P type is a decimal value. Let's look at a definition first.G_p17 type p decimals 2. Here, g_p17 has 17 digits (13-digit integer, 1 decimal point, 2 decimal places, and 1 plus or minus sign ). P --> CWhen creating some interface files, such as

Use the C library function to get the current local time

1. tm struct Struct tm { IntTm_sec;/* seconds after the minute [0-60] */Int tm_min;/* Minutes after the hour [0-59] */Int tm_hour;/* Hours since midnight [0-23] */Int tm_mday;/* Day of the month [1-31] */Int tm_mon;/* Months since January [0-11]

Understanding of C and C ++ memory

In C and C ++ language development, pointers and memory have always been the focus of learning. C language, as a low-and middle-level language, provides a large amount of memory for direct operations. This maximizes the flexibility of the program

C Primer Plus 02 --- integer overflow and formatting output (interesting data storage ring --- this is understandable)

[Cpp] # include int main (void) {int I = 2147483647; unsigned int j = 4294967295; printf ("% d * % d ** % d \ n", I, I + 1, I + 2); printf ("% u * % u ** % u \ n", I, I + 1, I + 2 ); printf ("% d * % d ** % d \ n", j, j + 1, j + 2 ); printf ("% u *

9 degree tutorial 25th questions

C language source code: [cpp] # include # include # include # define maxsize 600 double lengthcmax, pricemin, falg; double cmax, length, davg; int n; typedef struct station {double price; double length;} station; station sta [maxsize]; int cmp

Differences between pointer functions and function pointers

I, When I learned about arm, I found that the "pointer function" and "function pointer" are easy to make mistakes. So today, I want to figure it out and find some information, first, the definitions between them: 1. A pointer function is a function

Question 16: each student's student ID, name, C ++, high number, and English score define an array of student scores.

/*************************************** ************************C LanguageAUTHOR: liuyongshui**************************************** ***********************//*Question 16: each student's student ID, name, C ++, high number, and English score

Question 39: The program outputs various asterisks (5)

[Plain]/* Start the comments in the program header (to avoid any problems encountered during the submission of blog posts, the slash used to indicate that the comments have been deleted)* Copyright and version Declaration of the program* All rights

Question: In the array score, the results of a group's C ++ program design will be stored.

[Plain]/* Start the comments in the program header (to avoid any problems encountered during the submission of blog posts, the slash used to indicate that the comments have been deleted)* Copyright and version Declaration of the program* All rights

Question 16th: the shortest distance between the two arrays.

[Plain]/* Start the comments in the program header (to avoid any problems encountered during the submission of blog posts, the slash used to indicate that the comments have been deleted)* Copyright and version Declaration of the program* All rights

Question 12th: quantity of quality.

199 is also a prime number.     [Plain]# Include  Int main (){Int I;Int j;Int k;Int flag = 0;Int num;Printf ("% 3d is a prime number. \ n", 2); // 2 is the only one with an even number and a prime number. For (I = 1; 2 * I-1 {Num = 2 * I-1; If

Question: valid C identifier

  [Plain]# Include # Include  Int main (){Int I;Int num;Int flag = 1;Char a [100];Gets ();Num = strlen (); If (a [0]> = 'A' & a [0] = 'A' & A [0] {For (I = 1; I {If (a [I]> = 'A' & a [I] = 'A' & A [I] = '0' & a [I] {Flag = 1;}Else{Flag = 0;}If

Two functions for exception handling in C Language

Compared with the stimulus abort () and exit (), the goto statement seems to be a more feasible solution to handle exceptions. Unfortunately, goto is local: it can only jump to the internal label of the function, but cannot transfer control to any

String segmentation in C Language -- strtok

Previously, we had to implement string splitting by ourselves. Recently, we found that the c standard library already provides this function. I am still not familiar with the standard library, which leads to repeated wheel creation. It is necessary

Question 7: f = 1! + 1/2! + 1/3! + 1/4! +... + 1/n! (N is a large number. If n is too large, it will overflow)

/*************************************** ************************Accumulated (C language)AUTHOR: liuyongshuiDATE :************************************************ ***********************//*Question 7: f = 1! + 1/2! + 1/3! + 1/4! +... + 1/n! (N is a

Question 83: Quicksum

Print? Quicksum data consists of only 26 upper-case letters and spaces, and must start and end with an upper-case letter. In addition, Quicksum data can be any combination, including consecutive spaces. Quicksum is the sum of the product of each

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