We start today with a linking error:

> make
CC    -c  readWorkoutData.cc
CC    -c  computeSplitTime.cc
CC -o readWorkoutData readWorkoutData.o computeSplitTime.o
Undefined                       first referenced
 symbol                             in file
double computeSplitTime(char*)        readWorkoutData.o
ld: fatal: Symbol referencing errors. No output written to readWorkoutData
*** Error code 1
make: Fatal error: Command failed for target `readWorkoutData'
> 


You get a linking error when you have a ____ without a matching ____

fn call ... fn defn

What I want to do is find all the reference to computeSplitTime in my .cc files


What Unix command can I type?


  grep computeSplitTime *.cc

> grep computeSplitTime *.cc
computeSplitTime.cc:// computeSplitTime.cc
computeSplitTime.cc:// separately compiled computeSplitTime() function
computeSplitTime.cc:double computeSplitTime(const char *  const splitTimePtr)
readWorkoutData.cc:double computeSplitTime(char * splitTimePtr);
readWorkoutData.cc:      workout[i].splitTimeSeconds = computeSplitTime(splitTimePtr);
testComputeSplitTime.cc:// write test cases for the computeSplitTime function
testComputeSplitTime.cc:// split out the computeSplitTime function to a separate file
testComputeSplitTime.cc:double computeSplitTime(const char * const splitTimePtr);
testComputeSplitTime.cc:  double result = computeSplitTime(splitTimePtr);
> 


Factor out the function prototype into a .h file (a header file)