Warning: Undefined reference to function [closed] - c

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I keep getting the warning that my function has an undefined reference and that doesn't really say much to me or how to fix it. Here are the errors
log_2.c: In function ‘main’: log_2.c:29: warning: implicit
declaration of function ‘logbase2’ /tmp/ccAXAmVb.o: In function
'main': log_2.c:(.text+0x5e): undefined reference to `logbase2'
collect2: ld returned 1 exit status
Heres my code:
int logbasetwo (int number)
{
int test;
for (int i = 0; i< number; i++){
test = 2 ^ i;
int result = i;
}
return result;
}
int main(){
printf("Enter a positive integer: ");
int number = get_int();
int logresult;
if (number > 0){
logresult=logbase2(number);
}
else (number < 0){
printf("Not a positive number. Re-enter: ");
number = get_int();
}
printf("Log base two of number is:%i", logresult);
}
return 0;
}

Answer 1

Well, in your code , both logbase2() and logbasetwo() are used, which are not the same !!!
You have defined a function named logbasetwo(), but you called logbase2().
Change either of them to match other one.
Also, you need to change the logic test = 2 ^ i;. As mentioned in earlier comment by Mr. #Bathsheba, ^ operator is for XOR, not exponentiation.
You need to use pow().