Esempi Puntatori e Stringhe 1

// This program puts values into an array, sorts the values into// ascending order, and prints the resulting array.#include <iostream>

using std::cout;using std::endl;

#include <iomanip>

using std::setw;

void bubbleSort( int *, const int );

int main(){ const int arraySize = 10; int a[ arraySize ] = { 2, 6, 4, 8, 10, 12, 89, 68, 45, 37 }; int i;

Esempi Puntatori e Stringhe 2

cout << "Data items in original order\n";

for ( i = 0; i < arraySize; i++ ) cout << setw( 4 ) << a[ i ];

bubbleSort( a, arraySize ); // sort the array cout << "\nData items in ascending order\n";

for ( i = 0; i < arraySize; i++ ) cout << setw( 4 ) << a[ i ];

cout << endl; return 0;}

Esempi Puntatori e Stringhe 3

void bubbleSort( int *array, const int size ){ void swap( int * const, int * const );

for ( int pass = 0; pass < size - 1; pass++ )

for ( int j = 0; j < size - 1; j++ )

if ( array[ j ] > array[ j + 1 ] ) swap( &array[ j ], &array[ j + 1 ] );}

void swap( int * const element1Ptr, int * const element2Ptr ){ int hold = *element1Ptr; *element1Ptr = *element2Ptr; *element2Ptr = hold;}

Esempi Puntatori e Stringhe 4

Data items in original order

2 6 4 8 10 12 89 68 45 37

Data items in ascending order

2 4 6 8 10 12 37 45 68 89

Esempi Puntatori e Stringhe 5

// Using subscripting and pointer notations with arrays

#include <iostream>

using std::cout;using std::endl;

int main(){ int b[] = { 10, 20, 30, 40 }, i, offset; int *bPtr = b; // set bPtr to point to array b

cout << "Array b printed with:\n" << "Array subscript notation\n";

for ( i = 0; i < 4; i++ ) cout << "b[" << i << "] = " << b[ i ] << '\n';

Esempi Puntatori e Stringhe 6

cout << "\nPointer/offset notation where\n" << "the pointer is the array name\n";

for ( offset = 0; offset < 4; offset++ ) cout << "*(b + " << offset << ") = " << *( b + offset ) << '\n';

cout << "\nPointer subscript notation\n";

for ( i = 0; i < 4; i++ ) cout << "bPtr[" << i << "] = " << bPtr[ i ] << '\n';

cout << "\nPointer/offset notation\n";

Esempi Puntatori e Stringhe 7

for ( offset = 0; offset < 4; offset++ ) cout << "*(bPtr + " << offset << ") = " << *( bPtr + offset ) << '\n';

return 0;}

Esempi Puntatori e Stringhe 8

Array b printed with:

Array subscript notation

b[0] = 10

b[1] = 20

b[2] = 30

b[3] = 40

Pointer/offset notation where

the pointer is the array name

*(b + 0) = 10

*(b + 1) = 20

*(b + 2) = 30

*(b + 3) = 40

Esempi Puntatori e Stringhe 9

Pointer subscript notation

bPtr[0] = 10

bPtr[1] = 20

bPtr[2] = 30

bPtr[3] = 40

Pointer/offset notation

*(bPtr + 0) = 10

*(bPtr + 1) = 20

*(bPtr + 2) = 30

*(bPtr + 3) = 40