WEBVTT

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Welcome back.

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We learned about functions.

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Now let's solve this practice.

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Build a simple calculator function that does the and and calculates the arithmetic operations subtraction,

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addition, multiplication and division and make it functional and can be used okay.

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So for that we need to define functions I want from you to pause the video and think about it.

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Create four functions and let's try to solve it.

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I hope you pause the video, think about it and solve it correctly.

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Otherwise don't worry, we're going to clarify everything.

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At first we can define a new function called add takes into parameters two, a and b.

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We can define a return statement a plus b.

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This is very simple.

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Another function called subtract a minus b, return a minus b another function.

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Multiply a times b and divide a over b.

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But here there is a very important note b will should not be Zero.

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So if we need to use if B doesn't equal to zero, return A over B.

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Otherwise can't divide by zero.

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So here inside this function test, if B is not zero.

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If it is zero, go and tell the compiler to return can divide by zero message.

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Otherwise, if b is not equal to zero, return a over B and do the division function.

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Let's test our code.

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So here testing our calculator.

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Define two variables x equal to ten y equals to 8 or 20.

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Let's test the addition.

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Print any errors.

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Run.

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And here we go.

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Ten plus 20 equals to 30.

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Let's test the subtract multiply and divide.

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Let's run.

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And here we go ten -20 -1010 times 2210 over 20 0.5 okay congratulations guys.

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We succeeded in building this simple calculator using functions and the return statement.