Question about Ch 1.Arrays And Strings 3.URLify

[yueran1]

at line 27: int extendedLen = len + 2 * numOfSpaces;
I do not really understand why we should time 2 to the numOfSpaces? why not times 3? Cause length of space =1, and length of %20=3

[sergio-nsk]

It is because we replace 1-char spaces with 3-chars sequences, in other words we need additionally 2 chars for each space.

Assume we have N spaces, they occupy N chars.
We need 3 * N chars in sum for N of "%20". But we have N chars already that will be free if we remove spaces, thus we need additional 3 * N - N chars , that is equal to 2 * N.

[shivamkumar001]

Can you please assign this issue to me ? I can solve this