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#1
February 17th, 2013, 05:34 AM
 mdzar
Registered User

Join Date: Feb 2013
Posts: 1
Time spent in forums: 30 m 57 sec
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Recursive function help

Hi there guys,

As part of my course work, I'm required to write a recursive function with the following signature:

int cpyUpperCase(const char A[], char B[])

The intention is that the recursive function would go through all elements in A and check if it's upper case and if so.. put that element in B.

The actual function should return the number of upper case letters found.

Please help.

So far, I managed to write a non-recursive version of the function, not sure how to convert to recursion.

Code:
```int cpyUpperCase(const char A[], char B[])
{
int counter = 0;
int upperCaseCounter = 0;
int sizeOfA= strlen(A);
for(counter=0; counter<sizeOfA; counter++)
{
if(isupper(A[counter]))
{
upperCaseCounter++;
B = (char*) realloc (B, upperCaseCounter * sizeof(char));
B[upperCaseCounter-1]= A[counter];
}
}

return upperCaseCounter;
}```

#2
February 17th, 2013, 09:12 PM
 BobS0327
Contributing User

Join Date: Oct 2012
Posts: 118
Time spent in forums: 3 Days 18 h 48 m 29 sec
Reputation Power: 44
One possible solution would be to use a static int variable in your recursive function cpyUpperCase to be used as an index in your B char array which stores only the upper case characters found in your A character array.

Upon entering your recursive array, you would first iterate thru your A input array. You would check the first character in the A array to determine if it was upper case or not. If upper case, you would add it to your B array and increment your static int variable to point to the next position in your B array. Next you would call cpyUpperCase function using the A array ( the input A array would be incremented by one position to allow processing on each consecutive character of the A array) and the B array from within cpyUpperCase. That is, you are recursively calling cpyUpperCase from within cpyUpperCase to process each letter in the A array.

You would continue with this procedure until you encounter the null character in your A array.

There are a couple of other solutions but IMHO, they're just too convoluted to be easily implemented.
Comments on this post
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