House and door

Challenge 15 of 20

The roof and the door both hang off mid, and that is exactly what lines the door up underneath the peak. Use that box in both lines and the house holds together.

Write the two missing lines.

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Write the two missing lines.

Console print() output

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Lesson Put It All Together

Everything from this course in one place: number variables, words, the four sums, and placing shapes with width and height.

As in the last topic of Course 1, each picture has missing lines with a // comment above telling you what to write. The difference is that positions should now be worked out from variables rather than typed as fixed numbers. If a comment says "60 left of the middle", that is width / 2 - 60, not 140.

It gives the same answer today, but it says why. Written that way the picture still holds together if a number above it changes, and it reads as a description of the drawing rather than a list of measurements someone once took. That is the habit worth building.

Two things make these easier than they look. Most pictures are symmetrical, so a line you have already written is usually most of the next one — copy it and change the number that differs. And where a value is already sitting in a box, use its name rather than the number inside it.

Take the lines one at a time and press Run after each. A picture that is half right scores partly right, so you can watch yourself getting closer rather than guessing at the end.