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Regex redefinition error

By : user3851351
Date : October 17 2020, 11:12 AM
may help you . Regular expression syntax simply does not allow multiple occurrences of identically-named groups -- groups that aren't "reached" are defined to be "empty" (None) on a match.
So you have to change those names e.g. to dob0, dob1, dob2 and id0, id1, id2 (then you can easily "collapse" these sets of keys to make the dict you actually want after you have a groups dictionary from a match).
code :

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Regex Problem Group Name Redefinition?

By : MrBubbles
Date : March 29 2020, 07:55 AM
it helps some times No, you can't have two groups of the same name, this would somehow defy the purpose, wouldn't it?
What you probably really want is this:
code :

new to C , error C2371: 'error" : redefinition; diffrent basic types

By : user75904
Date : March 29 2020, 07:55 AM
Any of those help One of your problems is your use of the error function in CommandSwitch.
code :
void CommandsSwitch(char *orders) {
 FILE *input , *output;
 input = fopen(orders, "rt");
 output = fopen("result.txt" , "wt");
 if (input == NULL) {
   error("can't open file, might not exists");
 else if (output == NULL) {
   error("can't open file");
 /* ...more... */
static void error(char *msg) {
 fprintf(stderr , "Error: %s\n", msg);
int error(...);
static void error(char *);

Error C2365: redefinition of enum and Error 2086 redefinition

By : tepcom comtep
Date : March 29 2020, 07:55 AM
help you fix your problem Assuming the .h file in the question is called 'huffman.h', change it to the following:
code :
#ifndef __huffman_h__
 #define __huffman_h__

#include <stdio.h>
typedef enum { COMPRESS, DECOMPRESS } operation;
void compress(FILE * file);
void compressArchive(FILE * files[]);
void decompress(FILE * file);
void decompressArchive(FILE * files[]);

#endif /* __huffman_h_ */

MSVC error - error C2373: 'description': redefinition; different type modifiers

By : K.H. Kuo
Date : March 29 2020, 07:55 AM
should help you out It seems that MSVC wants us to precise the array length, this should work :
code :
#include <iostream>
#include <type_traits>

namespace MyNS {
    struct Test1 {};
    template <typename > class Test;

    template <> class Test<Test1> {
            constexpr static char const *description[2] = { "X1", "Y1",};
    constexpr char const *Test<Test1>::description[];
    static const char * getDesc(int i) {
        return MyNS::Test<MyNS::Test1>::description[i];

int main()
    std::cout << MyNS::getDesc(0) << std::endl;

'Date': 'class' type redefinition: ERROR (calendar.cpp file error)

By : DarkLizard42
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further Since you have declaration of your class in the Calender.h file, your implementation in the Calender.cpp is in fact redfining your class. The correct way to do that would be to reference the class using the scope resolution operator ' :: '
Your Calender.cpp file should look like this:
code :
#include <iostream>
#include <string>
#include <sstream>
#include "Calendar.h"

char months[12][10] = { "January", "February", "March","April","May","June","July","August","September","October","November","December" };

// your default no-args class constructor
    dd = 1; mm = 1; yy = 1900;

        Another Way you could implement your constructor is by using initialisation lists (check our the second link in my answer to know more)
        Date::Date(int m, int d, int y) : mm(m), dd(d), yy(y) { }

Date::Date(int m, int d, int y) {
    // your constructor code here

bool Date::checkdate(){
    // your implementation here
bool Date::checkleapyear(){
    // your implementation here
string Date::toString(){
    // your implementation here
Date Date::nextDate(){
    // your implementation here
void Date::compareDates(Date &d){
    // your implementation here
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