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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
Not a kata issue but a problem in your code: please review the C++ basics.
C++
It seems that the linker is unable to find the definition of the DigPow::digPow function, resulting in the "undefined reference" error.
"/tmp/main-7834c7.o: In function
dotest(int, int, int)': main.cpp:(.text+0xa): undefined reference toDigPow::digPow(int, int)'/tmp/main-7834c7.o: In function
digPow_Tests::Fixed__Tests()': main.cpp:(.text._ZN12digPow_Tests12Fixed__TestsEv[_ZN12digPow_Tests12Fixed__TestsEv]+0x12): undefined reference toDigPow::digPow(int, int)'main.cpp:(.text._ZN12digPow_Tests12Fixed__TestsEv[_ZN12digPow_Tests12Fixed__TestsEv]+0x72): undefined reference to
DigPow::digPow(int, int)' main.cpp:(.text._ZN12digPow_Tests12Fixed__TestsEv[_ZN12digPow_Tests12Fixed__TestsEv]+0xd2): undefined reference toDigPow::digPow(int, int)'main.cpp:(.text._ZN12digPow_Tests12Fixed__TestsEv[_ZN12digPow_Tests12Fixed__TestsEv]+0x132): undefined reference to `DigPow::digPow(int, int)'
clang: error: linker command failed with exit code 1 (use -v to see invocation)"