How do I write this without using the inbuilt function "max" ?

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Write a function that takes a number and returns the largest digit value in the 
number. For example, given 34567 the function returns 7, and given 28634 it 
returns 8.

What I have tried:

I can only do it by using "max"

Posted 22-Nov-20 5:22am

metalhead.me

Updated 22-Nov-20 6:13am

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2 solutions

Solution 1

python - Find the maximum digit of an integer - Stack Overflow[^]

Posted 22-Nov-20 5:51am

Gerry Schmitz

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OriginalGriff · Accepted Answer · 2020-11-22T06:13:00

Start by writing a function that extracts each digit from the number.
When you have that working, loop through each digit comparing them:

1) Set a "max value so far" variable to a "not the biggest value" (integer minimum value for example, of the first digit minus one).
2) Loop through all digits
2.1) Compare them against the "max value so far".
2.1.1) If the digit is bigger, set "max value so far" to the digit.
2.2) Move on to next digit.
3) After the loop, the largest digit is "max value so far".

Try it: it's not complicated!