Question

C Question: What's wrong with my source code?

Answer 1

Alright, I'm having problems with functions. Whenever I try to compile the source code, it returns this:

Undefined symbols for architecture x86_64:
"_main", referenced from:
start in crt1.10.6.o
ld: symbol(s) not found for architecture x86_64
collect2: ld returned 1 exit status

I removed the actual contents of the functions because they aren't the problem.

#include <stdio.h>

void MainMenu();
void ProcessChoice();
void ProcessMenuReturn();
void ExchangeRates();

char Choice, MenuReturn;
float Rates[7] = { 43.90 , // USD
59.50 , // EUR
34.12 , // SGD
0.58 , // JPY
67.94 , // GBP
45.24 , // AUD
43.07 }; // CAD


void MainMenu() {
//some code here
}

void ProcessChoice() {
//some code here
}

void ProcessMenuReturn() {
//some code here
}

void ExchangeRates() {
// some code here
}

Answer 2

is there a main() function anywhere in your program?

Answer 3

I don't see one. There is no entry point to the code.

Answer 4

first of all as mentioned, you are missing the main() function, which is the entry to your program, this is needed in C/C++, but there exists other languages which does not require main function, like python (the whole file it self becomes the main when it is executed)