"[Linker error] undefined reference to 'function()'

[deibaby03]

#include <stdio.h>
#include <string.h>
#include <conio.h>
#include <stdlib.h>

int themenu();
int boygroups();
int girlgroups();
int solo();
int sub();



int main(void)
{
themenu();
return 0;
}

int themenu()
{
int pili,sagot,ans,kunin=0,yes,tuloy;
printf("\n\n\n\n\n\t\tTHIS MENU IS ALL ABOUT KPOP\n");
printf("\n\t\t\t\t1. Boy Groups\n");
printf("\t\t\t\t2. Girl Groups\n");
printf("\t\t\t\t3. Solo Performer\
printf("\t\t\t\t4. Sub-groups\n");
printf("\t\t\t\t5. I want to exit now\n");
printf("\n\t\t\tChoose the number you want: ");
scanf("%d",&pili);
switch (pili)
{
case 1:
printf("\n\n\n\t\t\t\t1. %s\n",unang[0].numberone);
printf("\t\t\t\t2. %s\n",unang[0].numbertwo);
printf("\t\t\t\t3. %s\n",unang[0].numberthree);
printf("\t\t\t\t4. %s\n",unang[0].numberfour);
break;
case 2:
printf("\n\n\n\t\t\t\t1. %s\n",unang[1].numberone);
printf("\t\t\t\t2. %s\n",unang[1].numbertwo);
printf("\t\t\t\t3. %s\n",unang[1].numberthree);
printf("\t\t\t\t4. %s\n",unang[1].numberfour);
break;
case 3:
printf("\n\n\n\t\t\t\t1. %s\n",unang[2].numberone);
printf("\t\t\t\t2. %s\n",unang[2].numbertwo);
printf("\t\t\t\t3. %s\n",unang[2].numberthree);
printf("\t\t\t\t4. %s\n",unang[2].numberfour);
break;
case 4:
printf("\n\n\n\t\t\t\t1. %s\n",unang[3].numberone);
printf("\t\t\t\t2. %s\n",unang[3].numbertwo);
printf("\t\t\t\t3. %s\n",unang[3].numberthree);
printf("\t\t\t\t4. %s\n",unang[3].numberfour);
break;

}

printf("\n\t\t\tChoose the number you want: ");
scanf("%d",&ans);



kunin=pili;

if(kunin==1)
int boygroups();


else if(kunin==2)
int girlgroups();

else if(kunin==3)
int solo();

else if(kunin==4)
int sub();


return 0;
getch();

}


int boygroups(int ans) {
switch (ans) {
case 1: printf("\n\n\n\t\t\t\t1. %s\n",songs[0].una);
printf("\t\t\t\t2. %s\n",songs[0].pangalawa);
printf("\t\t\t\t3. %s\n",songs[0].pangatlo);
printf("\t\t\t\t4. %s\n",songs[0].pangapat);
break;
case 2: printf("\n\n\n\t\t\t\t1. %s\n",songs[1].una);
printf("\t\t\t\t2. %s\n",songs[1].pangalawa);
printf("\t\t\t\t3. %s\n",songs[1].pangatlo);
printf("\t\t\t\t4. %s\n",songs[1].pangapat);
break;
case 3: printf("\n\n\n\t\t\t\t1. %s\n",songs[2].una);
printf("\t\t\t\t2. %s\n",songs[2].pangalawa);
printf("\t\t\t\t3. %s\n",songs[2].pangatlo);
printf("\t\t\t\t4. %s\n",songs[2].pangapat);
break;
case 4: printf("\n\n\n\t\t\t\t1. %s\n",songs[3].una);
printf("\t\t\t\t2. %s\n",songs[3].pangalawa);
printf("\t\t\t\t3. %s\n",songs[3].pangatlo);
printf("\t\t\t\t4. %s\n",songs[3].pangapat);
break;
default: return themenu();
}
}

int girlgroups(int ans) {
switch (ans) {
case 1: printf("\n\n\n\t\t\t\t1. %s\n",songs[4].una);
printf("\t\t\t\t2. %s\n",songs[4].pangalawa);
printf("\t\t\t\t3. %s\n",songs[4].pangatlo);
printf("\t\t\t\t4. %s\n",songs[4].pangapat);

break;
case 2: printf("\n\n\n\t\t\t\t1. %s\n",songs[5].una);
printf("\t\t\t\t2. %s\n",songs[5].pangalawa);
printf("\t\t\t\t3. %s\n",songs[5].pangatlo);
printf("\t\t\t\t4. %s\n",songs[5].pangapat);
break;
case 3: printf("\n\n\n\t\t\t\t1. %s\n",songs[6].una);
printf("\t\t\t\t2. %s\n",songs[6].pangalawa);
printf("\t\t\t\t3. %s\n",songs[6].pangatlo);
printf("\t\t\t\t4. %s\n",songs[6].pangapat);
break;
case 4: printf("\n\n\n\t\t\t\t1. %s\n",songs[7].una);
printf("\t\t\t\t2. %s\n",songs[7].pangalawa);
printf("\t\t\t\t3. %s\n",songs[7].pangatlo);
printf("\t\t\t\t4. %s\n",songs[7].pangapat);
break;
} }


int solo(int ans) {
switch (ans) {
case 1: printf("\n\n\n\t\t\t\t1. %s\n",songs[8].una);
printf("\t\t\t\t2. %s\n",songs[8].pangalawa);
printf("\t\t\t\t3. %s\n",songs[8].pangatlo);
printf("\t\t\t\t4. %s\n",songs[8].pangapat);
break;
case 2: printf("\n\n\n\t\t\t\t1. %s\n",songs[9].una);
printf("\t\t\t\t2. %s\n",songs[9].pangalawa);
printf("\t\t\t\t3. %s\n",songs[9].pangatlo);
printf("\t\t\t\t4. %s\n",songs[9].pangapat);
break;
case 3: printf("\n\n\n\t\t\t\t1. %s\n",songs[10].una);
printf("\t\t\t\t2. %s\n",songs[10].pangalawa);
printf("\t\t\t\t3. %s\n",songs[10].pangatlo);
printf("\t\t\t\t4. %s\n",songs[10].pangapat);
break;
case 4: printf("\n\n\n\t\t\t\t1. %s\n",songs[11].una);
printf("\t\t\t\t2. %s\n",songs[11].pangalawa);
printf("\t\t\t\t3. %s\n",songs[11].pangatlo);
printf("\t\t\t\t4. %s\n",songs[11].pangapat);
break;
} }


int sub(int ans) {
switch (ans) {
case 1: printf("\n\n\n\t\t\t\t1. %s\n",songs[12].una);
printf("\t\t\t\t2. %s\n",songs[12].pangalawa);
printf("\t\t\t\t3. %s\n",songs[12].pangatlo);
printf("\t\t\t\t4. %s\n",songs[12].pangapat);
break;
case 2: printf("\n\n\n\t\t\t\t1. %s\n",songs[13].una);
printf("\t\t\t\t2. %s\n",songs[13].pangalawa);
printf("\t\t\t\t3. %s\n",songs[13].pangatlo);
printf("\t\t\t\t4. %s\n",songs[13].pangapat);
break;
case 3: printf("\n\n\n\t\t\t\t1. %s\n",songs[14].una);
printf("\t\t\t\t2. %s\n",songs[14].pangalawa);
printf("\t\t\t\t3. %s\n",songs[14].pangatlo);
printf("\t\t\t\t4. %s\n",songs[14].pangapat);
break;
case 4: printf("\n\n\n\t\t\t\t1. %s\n",songs[15].una);
printf("\t\t\t\t2. %s\n",songs[15].pangalawa);
printf("\t\t\t\t3. %s\n",songs[15].pangatlo);
printf("\t\t\t\t4. %s\n",songs[15].pangapat);
break;
} }


this is my code, when I tried to run it, the compiler will always say about Linker error thing, i tried removing the int before declaring functions but it will say the same error again, what do you think is my mistake here?

[MikeyBoy]

1) Please use code tags when posting code, to make it readable:

http://www.cplusplus.com/articles/z13hAqkS/

2) Your linker will be telling you exactly which symbols are undefined. I'm sure you have a good reason for deciding to withhold that information from us, but I'm struggling to work out what that reason might be.

3) I notice that your function declarations,e.g. :

int solo();

don't match the function definitions, e.g. :

int solo(int ans) {

[deibaby03]

what do you think i'll write to make it match, and sorry for not following rules, it's my first time asking question here.

[MikeyBoy]

what do you think i'll write to make it match

Surely you can see the obvious difference between your declaration and your definition?

[deibaby03]

i can't i tried so many ways how to do it but i just can't. please help me.

[MikeyBoy]

So the following two lines look exactly the same to you?

int solo()

int solo(int ans)

[deibaby03]

no. i tried erasing 'int ans' on the other one, and also tried putting 'int ans' on the other one, but i still get an error?

[MikeyBoy]

As you could have found out from any textbook or tutorial - in less time than you've spent posting here - your declaration needs to show the types of the arguments to the function. If you're still getting errors after that, then there's another problem.

[Jaybob66]

you need to post the actual error so we can see,

obviously its difficult to tell us what the problem is when you are a beginner, so its even more important to show us the actual error.