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Write a function calc(a, op, b) for +, -, * and /…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
Write a function calc(a, op, b) for +, -, * and /. For division by zero it should give a message, not an error. What are calc(6, "+", 3), calc(6, "/", 4) and calc(6, "/", 0)?
Need a reminder? The key ideaShow
Test for the dangerous case before you divide.
The worked solution
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, compare your working with the solution.
Plan. An if, elif ladder on the sign. In the division branch, test b == 0 first.
calc(6, "+", 3)is .calc(6, "/", 4)is .calc(6, "/", 0)gives the messagecannot divide by zero.
Any other sign gives unknown operation.
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