Thread: while loop reading spaces as '\0' ?

I'm trying to make setArray remove spaces and punctuation from my array. But it seems like as soon as it encounters a space the while loop is exiting out. Is a blank the space the same as '\o' ?

I'm using "a man a plan canal panama" as my palindrome.

Code:

#include <stdio.h>

int testPalindrome(char[], int, int);
void setArray(char[]);

int main()
{
   char string[ 25 ];
   int arraySize = 15, nSize = 15;
   scanf("&#37;s", &string);

   setArray( string );
   /* Test Statement */
   printf("%s\n", string);

   while( string[ arraySize - 1 ] != '\0' ) {
      --arraySize;
      printf("arraySize: %d\n", arraySize);
   }

   --arraySize;
   nSize = arraySize - 1;

   printf("arraySize: %d nSize: %d\n", arraySize, nSize);
   printf("%d\n", testPalindrome(string, nSize, arraySize) );


return 0;
}



void setArray(char theArray[])
{
   int n = 0;
   int i;

   while (theArray[ n ] != '\0') {
      if (theArray[ n ] == ' ' || theArray[ n ] == '.' || theArray[ n ] == '?') {
         i = n;
         while (theArray[ i ] != '\0' ) {
            theArray[ i ] = theArray[ i + 1 ];
            ++i;
         }
         theArray[ i ] = theArray[ i + 1 ];
      }
      ++n;      
   }

   return;
}



int testPalindrome(char array[], int n, int size)
{
   if (size % 2 == 1 && (size - 1) / 2 == n ) {
      // TEST STATEMENT
      printf("if 1 n: %d\n", n);
      return 1;
   }
   else if (size % 2 == 0 && (size - 1) / 2 == n) {
      // TEST STATEMENT
      printf("if 2 n: %d\n", n);
      if (array[ n ] == array[ size - n ])
         return 1;
      else
         return 0;
   }
   else {
      // TEST STATEMENT
      printf("if 3 n: %d\n", n);
      if (array[ n ] == array[ size - n - 1 ])
         return testPalindrome(array, n - 1, size);
      else
         return 0;
   }

}

Stop doing this.

Code:

   while( string[ arraySize - 1 ] != '\0' ) {
      --arraySize;
      printf("arraySize: %d\n", arraySize);
   }

Go forward. Don't overthink it.

Right here you likely encounter undefined behavior:

Code:

string[ arraySize - 1 ]

After which the rest of your program does not matter.

You're still making the same mistakes you made in the other two threads.