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This question has three parts: A$),$ B$),$ and C$).$

The following code segment reads a string $($consists of letters and digits$)$ from the keyboard and counts how many $0$ s are in the string

string str;

int zeroCount$=0$;

getline$($cin$,$str$)$;

for$($int i $=0$ ; i $<=$ str$.$length$()1$ ; i$++)\{$

if$($str$[$i$]==0)$

zeroCount$++$;

$\}$

Hint: If you are not familair with length$()$ function, str$.$length$()$ returns the number of actual characters in a string, and does not count the null character at the end of the string. Ex$.$ string str $=$ "Arizona"; str$.$length$()$ is $7($Arizona is $7$ characters$).$

You need to write $3$ different pieces of code. Do not merge all answers into one program.

A$)$ Rewrite the above code using a while loop. $[5$ Points$]$

B$)$ Modify the above code $($code given or your answer to part A above, your choice$)$ so that it count how many digits are in the string. ASCII values for digits are values are between $48-57.\text{'}0\text{'}$ is $48$ and $\text{'}9\text{'}$ is $57$ in ASCII values. The string may contain both digits and other characters, so you need to check each character one by one.

Example: If the given input string is a$12$b$34,$ the total digits is $4.[5$ Points$]$

C$)$ Write a C$++$ code segment that reads integers from the keyboard until user enter $0$ and determine the largest integer entered. There may be any number of inputs before the user enters $0,$ including no inputs at all. $0$ is counted as part of the input and should be shown as the largest integer if this is the case. $[6$ Points$]$