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Project: Magic or Math

There are many variations on the magic trick where the magician asks the audience member to think of a number. He then instructs the audience member to perform a number of math operations on that number that seem to generate a random result, however the magician is always able to miraculously guesses the correct result.

  • Think of a number
  • Double it
  • Add 10
  • Halve it
  • Subtract your original number
  • The answer is 5

Write a program that defines an integer variable with the original value randomly generated between 1 and 100. Print the value of the variable after each stage of the trick so we can see how the trick progresses. Run the program a number of times. Is the answer always 5?

Output
$ swiftc MagicOrMath.swift -I . -L . -lUtils error: link command failed with exit code 1 (use -v to see invocation) ld: library not found for -lUtils clang: error: linker command failed with exit code 1 (use -v to see invocation) $ swiftc MagicOrMath.swift -I . -L . -lUtils error: link command failed with exit code 1 (use -v to see invocation) ld: library not found for -lUtils clang: error: linker command failed with exit code 1 (use -v to see invocation) $ swiftc MagicOrMath.swift -I . -L . -lUtils error: link command failed with exit code 1 (use -v to see invocation) ld: library not found for -lUtils clang: error: linker command failed with exit code 1 (use -v to see invocation)

Solution