example_switch.cpp: properly return 0 #336
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The main function in example_switch.cpp was declared as `int main()` but actually does not return a value - this fixes this by adding `return 0` to the end of the function.
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The main function in example_switch.cpp was declared as
int main()but actually does not return a value - this fixes this by addingreturn 0to the end of the function.