Replace all pi challenge

#1


Could please have a look at my code and tell me what i am doing wrong? why is it reading 0.14 as 4?

#2

You are storing ‘0.14’ as a single character in str[i+1] but they are actually 4 different characters. So it is overwritten from 0 to . to 1 to 4 and only 4 is stored. Separate these as:-

str[i] = '3';
str[i+1]='.';
str[i+2]='1';
str[i+3]='4';
#3

Hey, this way its overwriting the other characters. If the input is xpixpi then the output should be x3.14x3.14

#4

In your code length of string would be constant i.e 7 for (xpippix) and hence on first replacement, it would become x3.14ix i.e. pip will be occupied by .14 think how you can handle this case? Hint: shift the characters by 2 to the right, then even if they are replaced it would have no effect on the string, i.e. your string length starts with 7 then increase to 9, then to 11
(Why the increment of 2 characters and not 4?
because pi is of 2 characters overwritten by 3. and 2 character length for 14 is required.)

Dry Run: -
xpippix -> xpipippix (after shift of two characters)
xpipippix -> x3.14ppix (Replacement for pi)
and this will continue through recursion

#5

I have modified your code:

#6

Thankyou for your help :slight_smile:

#7

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