Answer Posted / abdur rab

#include <stdio.h>

void reverse_string ( char* cp_string, int start, int end )
{
if ( cp_string && ( start < end ) ) {
*( cp_string + start ) ^= *( cp_string +
end )
^= *( cp_string + start ) ^= *(
cp_string + end );
reverse_string ( cp_string, ++start, --
end );
}
}


int main ( int argc, char* argv [] )
{
char ca_array [12]={"Hello World"};
char* cp_ptr = NULL;
char* cp_ptr_temp = NULL;

printf ( "\n Before Reverse :%s", ca_array );

reverse_string ( ca_array, 0, strlen ( ca_array ) -
1 );

cp_ptr_temp = cp_ptr = ca_array;
while ( NULL != ( cp_ptr_temp = (char*) strchr (
cp_ptr_temp, ' ' ) ) ) {
reverse_string ( cp_ptr, 0, ( cp_ptr_temp -
cp_ptr ) - 1 );
cp_ptr = ++cp_ptr_temp;
}
// change the final word
reverse_string ( cp_ptr, 0, ( ( strlen (
ca_array ) - 1 ) - ( cp_ptr - ca_array ) ) );

printf ( "\n After Reverse by Words :%s",
ca_array );
return ( 0 );
}

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