Question

Assignment

1) Your function will only write the Nth character of the array, supplied as a parameter by the caller. This is an example prototype (although you may want to change the return value type, based on the second twist, below).

void writeArrayNthBackward(const char [], int, int, int);

The first three arguments serve the same purpose as in the iterative example. The fourth argument (an int) supplies the N for the Nth character to print in the array. If n == 1, then the string is printed normally in reverse (no characters are dropped). If n == 2, then every "other" character is printed, and so on.

You can constrain N to be 1 <= N <= 3.

Your code does NOT need to output a newline ('endl') within the recursive function itself (as the above iterative version does), you can output the newline after the return of the function.

2) If any of the removed characters in the string were numbers (not letters), output their sum. For example, if your function removed the numbers 3 and 1 from the string 'abc123', the result would be 3 plus 1, which is 4. See the below table for more examples..

Submit both a test driver main() function (that tests at least all the below examples) as well as the writeArrayNthBackward function.

Example inputs and outputs:

Input string	N	Output
abc123	2	2ca (sum of numbers removed: 4)
hello	1	olleh (sum of numbers removed: 0)
hello	3	l (sum of numbers removed: 0)
c1c1c1	2	ccc (sum of numbers removed: 3)

Answer 1

Thanks for the question.

Below is the code you will be needing Let me know if you have any doubts or if you need anything to change.

Thank You !!

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#include<iostream>
using namespace std;

void writeArrayNithBackward(const char sentence [], int size, int &sum, int N){
  
   char letter;
   int countLetters=0;
   for(int i=size-1;i>=0; i--){
       countLetters+=1;
       letter = sentence[i];
       //cout<<countLetters<<" "<<letter<<endl;
       if(countLetters%N==0)cout<<letter;
       else{
           if('0'<=letter && letter<='9')sum+= letter-'0';
       }
   }
}
int main(){
  
   char sentence[] ="c1c1c1";
   int size = sizeof(sentence)/sizeof(char)-1;
   int sum=0;
   int N=2;
   writeArrayNithBackward(sentence,size,sum,N);
   cout<<"\nsum="<<sum<<endl;
  
  
}

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