array of strings
#include <iostream>
using namespace std;
int main(){
const int DAYS = 7;
const int MAX = 10;
char star[DAYS][MAX] = { "Sunday", "Monday", "Tuesday",
"Wednesday", "Thursday",
"Friday", "Saturday" };
for(int j=0; j<DAYS; j++)
cout << star[j] << endl;
return 0;
}Initializing an array
#include <iostream>
using std::cout;
using std::endl;
#include <iomanip>
using std::setw;
int main()
{
int n[ 10 ];
for ( int i = 0; i < 10; i++ )
n[ i ] = 0;
for ( int j = 0; j < 10; j++ )
cout << n[ j ] << endl;
return 0;
}0
0
0
0
0
0
0
0
0
0
Initializing an array in a declaration.
#include <iostream>
using std::cout;
using std::endl;
#include <iomanip>
using std::setw;
int main()
{
int n[ 10 ] = { 2, 7, 4, 8, 5, 4, 9, 7, 6, 3 };
for ( int i = 0; i < 10; i++ )
cout << n[ i ] << endl;
return 0;
}2
7
4
8
5
4
9
7
6
3
Linear search of an array
#include <iostream>
using std::cout;
using std::cin;
using std::endl;
int linearSearch( const int [], int, int ); // prototype
int main()
{
const int arraySize = 100;
int a[ arraySize ];
int searchKey = 28;
for ( int i = 0; i < arraySize; i++ )
a[ i ] = 2 * i;
int element = linearSearch( a, searchKey, arraySize );
cout << element << endl;
return 0;
}
int linearSearch( const int array[], int key, int sizeOfArray )
{
for ( int j = 0; j < sizeOfArray; j++ ){
if ( array[ j ] == key ){
return j;
}
}
return -1;
}14
Obtaining the number of array elements
#include <iostream>
using std::cout;
using std::endl;
int main() {
int values[] = {2, 3, 5, 7, 11, 13, 17, 19, 23, 29};
cout << endl
<< "There are "
<< sizeof values/sizeof values[0]
<< " elements in the array."
<< endl;
return 0;
}There are 10 elements in the array.
Passing arrays and individual array elements to functions
#include <iostream>
using std::cout;
using std::endl;
#include <iomanip>
using std::setw;
void modifyArray( int [], int ); // appears strange
void modifyElement( int );
int main()
{
const int arraySize = 5; // size of array a
int a[ arraySize ] = { 0, 1, 2, 3, 4 }; // initialize array a
modifyArray( a, arraySize );
for ( int i = 0; i < arraySize; i++ )
cout << setw( 3 ) << a[ i ];
modifyElement( a[ 3 ] );
cout << a[ 3 ] << endl;
return 0;
}
void modifyArray( int b[], int sizeOfArray )
{
for ( int i = 0; i < sizeOfArray; i++ )
b[ i ] = 200;
}
void modifyElement( int e )
{
e = 200 ;
}200200200200200200
Static arrays are initialized to zero.
#include <iostream>
using std::cout;
using std::endl;
void staticArrayInit( void );
void automaticArrayInit( void );
int main()
{
staticArrayInit();
automaticArrayInit();
staticArrayInit();
automaticArrayInit();
return 0;
}
void staticArrayInit( void )
{
static int array1[ 3 ];
for ( int i = 0; i < 3; i++ )
cout << "array1[" << i << "] = " << array1[ i ] << " ";
for ( int j = 0; j < 3; j++ )
array1[ j ] = 0;
}
void automaticArrayInit( void )
{
int array2[ 3 ] = { 1, 2, 3 };
for ( int i = 0; i < 3; i++ )
cout << "array2[" << i << "] = " << array2[ i ] << " ";
for ( int j = 0; j < 3; j++ )
array2[ j ] = 0;
}array1[0] = 0 array1[1] = 0 array1[2] = 0 array2[0] = 1 array2[1] = 2 array
2[2] = 3 array1[0] = 0 array1[1] = 0 array1[2] = 0 array2[0] = 1 array2[1]
= 2 array2[2] = 3
Use subscripting and pointer notations with arrays
#include <iostream>
using std::cout;
using std::endl;
int main()
{
int b[] = { 10, 20, 30, 40 };
int *bPtr = b;
for ( int i = 0; i < 4; i++ )
cout << *( b + i ) << "\n";
for ( int j = 0; j < 4; j++ )
cout << bPtr[ j ] << "\n";
for ( int i = 0; i < 4; i++ )
cout << *( bPtr + i ) << "\n";
return 0;
}10
20
30
40
10
20
30
40
10
20
30
40
