Thread: WIP: Command line calculator. New to C

Now I'm running into a compile error when I declare an extern variable.

I get this error from clang:

Code:

Undefined symbols for architecture x86_64:
  "_pmsdMath", referenced from:
      _funcPMSD in mathematics-99e99e.o
  "_pmsdNumber0", referenced from:
      _main in main-aa69d6.o
      _funcPMSD in mathematics-99e99e.o
  "_pmsdNumber1", referenced from:
      _main in main-aa69d6.o
      _funcPMSD in mathematics-99e99e.o
  "_pmsdTotal", referenced from:
      _funcPrintResult in mathematics-99e99e.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)

However, if I take out the extern variables, it compiles but doesn't print out any results.

You haven't grasped this "no global variables and pass parameters instead" thing.

Code:

void funcPMSD( int pmsdMath ) {
    double pmsdTotal;
    if(pmsdMath == 1) {

And main calls it with

Code:

funcPMSD(pmsd);