Converting lowercase letters to uppercase letters using a pointer
#include <iostream>
using std::cout;
using std::endl;
#include <cctype>
using std::islower;
using std::toupper;
void f( char * );
int main()
{
char phrase[] = "characters";
f( phrase );
cout << phrase << endl;
return 0;
}
void f( char *sPtr )
{
while ( *sPtr != "\0" )
{
*sPtr = toupper( *sPtr );
sPtr++;
}
}CHARACTERS
Display value of char *, then display value of char static_cast to void *
#include <iostream>
using std::cout;
using std::endl;
int main()
{
char *word = "again";
cout << "Value of word is: " << word << endl
<< "Value of static_cast< void * >( word ) is: "
<< static_cast< void * >( word ) << endl;
return 0;
}Value of word is: again
Value of static_cast< void * >( word ) is: 0x43e000
Printing a string one character at a time using a pointer
#include <iostream>
using std::cout;
using std::endl;
void f( const char * );
int main()
{
const char phrase[] = "a string";
f( phrase );
return 0;
}
void f( const char *sPtr )
{
for ( ; *sPtr != "\0"; sPtr++ )
cout << *sPtr;
}a string
Printing the address stored in a char * variable
#include <iostream>
using std::cout;
using std::endl;
int main()
{
char *word = "again";
cout << "Value of word is: " << word << endl
<< "Value of static_cast< void * >( word ) is: "
<< static_cast< void * >( word ) << endl;
return 0;
}Value of word is: again
Value of static_cast< void * >( word ) is: 0x43e000
Reverse string case using pointer arithmetic
#include <iostream>
#include <cctype>
using namespace std;
int main()
{
char *p;
char str[80] = "This Is A Test";
cout << "Original string: " << str << "\n";
p = str; // assign p the address of the start of the array
while(*p) {
if(isupper(*p))
*p = tolower(*p);
else if(islower(*p))
*p = toupper(*p);
p++;
}
cout << "Inverted-case string: " << str;
return 0;
}Original string: This Is A Test
Inverted-case string: tHIS iS a tEST
