determine credit card type from number c#

A verification code is required on the logon interface recently. The verification code is randomly generated. I have been learning Objctive-C for two months. Now I just got started. I don't know much about it. I finally got a random number from some materials.We found that Objctive -- C and C ++ have many similarities.

In the C language, the number of bytes for a double, long, unsigned, int, char type datahttp://blog.csdn.net/lyl0625/article/details/7350045============================I can't remember, put it down:is related to the machine word length and compiler:Therefore, the width of the int,long int,short int may vary depending on the compiler. But there are several ironcla

;7printf"%ld\n", c);8 }9 Ten return 0; One}Note the point:1. The input data is not more than the 2^32,32-bit system or the 64-bit used int represents a range of ( -2^31) ~ (2^31-1). Use long2. A long can be used to accept,uva the platform using 64-bit. Long also accounts for 4 bytes in 32-bit systems and does not meet the requirements of the topic.Get the number of bytes per data

Disclaimer: All rights reserved. Reprint must indicate source:http://blog.csdn.net/cartzhang/article/details/44203651Today I want to write a macro definition, I found that the macro definition can also write indeterminate parameters, but my macro is not used at the end.Because I think that after writing, this indefinite parameter brings me the trouble, better than the benefits of thinking more.So I defined two macros and defined the other with one macro.Take note of today's use of the

PDB is the abbreviation of program Debug Database;BackgroundI'm in charge of a services (service) problem, because of a DLL internal logic problems;After modifying the source code locally, rebuild the DLL (debug mode), then replace the DLL in the server with the latest, to see if the log is an error, and there is no PDB type file in services.Unfortunately, also reported is wrong, and the contents are as follows:The log does not indicate the exact loca

First, download the ADB software.Then open the System developer mode and debug mode.Open cmd software, switch to the ADB software folder path, enter the command: ADB devices, you can see the device number information.If the device number is a strange number like 00000001, it may have been brushed by unscrupulous traders. A normal device

C Language --> statistics on the number of occurrences of each type in the input stringProblem description: compile a program to count the number, white space character, and the number of times all other characters appear in the input string. Code implementation: # Include

is related to the machine word length and compiler:Therefore, the width of the int,long int,short int may vary depending on the compiler. But there are several ironclad principles (Ansi/iso):1 sizeof (Shortint) sizeof(int2sizeof(int ) sizeof(longint3short4 a long int should be at least 32 bits.Unsigned is an unsigned meaning.For example:16-bit compilersChar : 1 bytes Char*(pointer variable): 2 bytes short int : 2 bytes intint : 2 bytes float : 4 bytes Double : 8 bytes Long : 4 bytes Long Long

The is related to the machine word length and compiler: Therefore, the width of the int,long int,short int may vary depending on the compiler. But there are several ironclad principles (Ansi/iso): 1 sizeof (short int) 16-bit compiler char:1 bytes char* (i.e. pointer variable): 2 bytes Short Int:2 bytes int:2 bytes unsigned int:2 bytes float:4 bytes double:8 bytes long:4 bytes long long:8 bytes unsigned long:4 bytes 32-bit compiler Char:1 byte char* (that is, pointer variable): 4 by

The is related to the machine word length and compiler: Therefore, the width of the int,long int,short int may vary depending on the compiler. But there are several ironclad principles (Ansi/iso): 1 sizeof (short int) 16-bit compiler char:1 bytes char* (i.e. pointer variable): 2 bytes Short Int:2 bytes int:2 bytes unsigned int:2 bytes float:4 bytes double:8 bytes long:4 bytes long long:8 bytes unsigned long:4 bytes 32-bit compiler Char:1 byte char* (that is, pointer variable): 4 by

() {Try { stringUN =""; Un=Environment.username; returnun; } Catch { return "Unknow"; } finally { } } //6. Get the computer name Static stringGetComputerName () {Try { returnSystem.Environment.MachineName; } Catch { return "Unknow"; } finally { } } ///7 PC

in the C language, double long unsigned int char type data takes up the number of bytesis related to machine word length and compiler: Therefore, the width of int,long int,short int may vary depending on the compiler. But there are several principles (Ansi/iso):1 sizeof (short int) 2 sizeof (int) 3 short int should be at least 16 bits (2 bytes) 4 a long int sh

write a macro definition, the function is to convert the number of an int to the odd and even bits of the interchange, for example, 6 of the binary is 0110, the first and second interchange,// third and fourth position interchange, get 1001, the output should be 9#include Copyright NOTICE: This article for Bo Master original article, without Bo Master permission not reproduced."C" writes a macro definition

　　C # function runs out of execution (any parameter type and number of parameters general version)

Today's work encounters a string that is either a double character string and a flag that has several int types in the decimal point of the numeric stringFor example: "23.123"---"23123" + 3 is relatively simple. is to put the code here, later used, can be directly dragged to use#include "stdafx.h"#include #include #include void GetInfo (const char* pnum){if (strlen (pnum) = = 0){Return}Char num[100]={0};int index = 0;int decemal = 0;BOOL Bisdecemal = false;The variable string is not stored if it