Error: Undefined Reference to WinMain@16

[ProgrammerGRM]

Hi!

I'm writing a program in C++ to ask the user for a list of ten names and cities of residence in the format <firstname> <Surname> <city>.
I am using isspace to sort out the number of spaces, but then i have to sort the list by city and then in each city group alphabetically by name.
I have written numerous codes that have all failed me! This is the latest code I have written. There is one error message "undefined reference to 'WinMain@16'"
I have read in a number of places that including int main() solves this issue, however each time I do this, that error is replaced by about 20 others!! :/
If anyone has any ideas on how I might actually get this code working I would be most thankful!!:)
This is the code:

#include <cstring>
#include <algorithm>

const int STRING_BUFFER_SIZE=80;//increase this to allow for really long names
struct Individual {
char firstName[STRING_BUFFER_SIZE];
char lastName[STRING_BUFFER_SIZE];
char cityName[STRING_BUFFER_SIZE];
};
bool isGreater(const Individual& a, const Individual& b) {
int result;
return ((result=std::strcmp(a.cityName, b.cityName))?(result>0):((result=std::strcmp(a.lastName,b.lastName))?(result>0):(std::strcmp(a.firstName, b.firstName)>0)));
};
void bubbleSort(Individual* a, int aLength) {
for(bool swapped=true; (swapped && (!(swapped=false))); --aLength)
for(int i=1;i<aLength;++i)
if((isGreater(a[i-1],a[i])) && (swapped=true)) std::swap(a[i-1],a[i]);
};

[Pravesh Koirala]

where's your
int main()
function?

[ProgrammerGRM]

I left out the int main () function, because when I put that in, I loads more errors!!! :( Do you still think I should put it in??

[Pravesh Koirala]

Yes, perhaps that is what is generating the error.
Try putting int main() and if that doesn't work, int main(int argc, char* argv[]) and repost the errors

[ProgrammerGRM]

Ok, thank u so much for this help! :)

When I include int main () my code looks like:


#include <cstring>
#include <algorithm>
int main(){
const int STRING_BUFFER_SIZE=80;//increase this to allow for really long names
struct Individual {
char firstName[STRING_BUFFER_SIZE];
char lastName[STRING_BUFFER_SIZE];
char cityName[STRING_BUFFER_SIZE];
};
bool isGreater(const Individual& a, const Individual& b) {
int result;
return ((result=std::strcmp(a.cityName, b.cityName))?(result>0):((result=std::strcmp(a.lastName,b.lastName))?(result>0):(std::strcmp(a.firstName, b.firstName)>0)));
};
void bubbleSort(Individual* a, int aLength) {
for(bool swapped=true; (swapped && (!(swapped=false))); --aLength)
for(int i=1;i<aLength;++i)
if((isGreater(a[i-1],a[i])) && (swapped=true)) std::swap(a[i-1],a[i]);
};
}

I am told there are 2 errors:
line 10: error: a function-definition is not allowed here before '{' token
line 14: error: a function-definition is not allowed here before '{' token

_____________________________________________________________________________

When I include int main(int argc, char* argv[]) my code looks like:

#include <cstring>
#include <algorithm>
int main(int argc, char* argv[]) {
const int STRING_BUFFER_SIZE=80;//increase this to allow for really long names
struct Individual {
char firstName[STRING_BUFFER_SIZE];
char lastName[STRING_BUFFER_SIZE];
char cityName[STRING_BUFFER_SIZE];
};
bool isGreater(const Individual& a, const Individual& b) {
int result;
return ((result=std::strcmp(a.cityName, b.cityName))?(result>0):((result=std::strcmp(a.lastName,b.lastName))?(result>0):(std::strcmp(a.firstName, b.firstName)>0)));
};
void bubbleSort(Individual* a, int aLength) {
for(bool swapped=true; (swapped && (!(swapped=false))); --aLength)
for(int i=1;i<aLength;++i)
if((isGreater(a[i-1],a[i])) && (swapped=true)) std::swap(a[i-1],a[i]);
};
}


I am told there are the exact same 2 errors as just using int main ():
line 10: error: a function-definition is not allowed here before '{' token
line 14: error: a function-definition is not allowed here before '{' token

Any ideas??? :)

[Pravesh Koirala]

You can't define one function inside another. Try this

#include <cstring>
#include <algorithm>

const int STRING_BUFFER_SIZE=80;//increase this to allow for really long names
struct Individual {
char firstName[STRING_BUFFER_SIZE];
char lastName[STRING_BUFFER_SIZE];
char cityName[STRING_BUFFER_SIZE];
};
bool isGreater(const Individual& a, const Individual& b) {
int result;
return ((result=std::strcmp(a.cityName, b.cityName))?(result>0):((result=std::strcmp(a.lastName,b.lastName))?(result>0):(std::strcmp(a.firstName, b.firstName)>0)));
};
void bubbleSort(Individual* a, int aLength) {
for(bool swapped=true; (swapped && (!(swapped=false))); --aLength)
for(int i=1;i<aLength;++i)
if((isGreater(a[i-1],a[i])) && (swapped=true)) std::swap(a[i-1],a[i]);
};


int main(int argc, char* argv[]) {
//Now do whatever you want
}

And by the way, your code is real messy, if you are on codeblocks, I will suggest doing
Plugin->Source Code Formatter

EDIT:
Remove all ';' after FUNCTION definition

[Pravesh Koirala]

After formatting it looked like

#include <cstring>
#include <algorithm>

const int STRING_BUFFER_SIZE=80;//increase this to allow for really long names
struct Individual
{
    char firstName[STRING_BUFFER_SIZE];
    char lastName[STRING_BUFFER_SIZE];
    char cityName[STRING_BUFFER_SIZE];
};
bool isGreater(const Individual& a, const Individual& b)
{
    int result;
    return ((result=std::strcmp(a.cityName, b.cityName))?(result>0):((result=std::strcmp(a.lastName,b.lastName))?(result>0):(std::strcmp(a.firstName, b.firstName)>0)));
};
void bubbleSort(Individual* a, int aLength)
{
    for(bool swapped=true; (swapped && (!(swapped=false))); --aLength)
        for(int i=1; i<aLength; ++i)
            if((isGreater(a[i-1],a[i])) && (swapped=true)) std::swap(a[i-1],a[i]);
};
}

int main(int argc, char* argv[])
{
//Now do whatever you want
}

[ProgrammerGRM]

Ok, thank u very much for all your help and your advice!!! :) :D

[ProgrammerGRM]

Any ideas on how I can use this code to write the program I need to write??