Multi dimensional Arrays - Introduction to Programming - Lecture Slides, Slides of Computer Programming

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Introduction to Programming

Lecture 16

In Today Lecture

 Conclude the last discussion

 Multi-dimensional Arrays

 Pointers to Pointers

Multi-dimensional Arrays char multi [ 5 ] [ 10 ] ;

Multi-dimensional Array in Memory

Placed sequentially in the memory 1st row 1st col 2nd row 1st col [0] [1] [2] [3] [4] [0] [1] [2] [3] [4] [0]^ [1]^ [2]^ [3]^ [4] 3rd row 1st col

*multi

Example 2

#include<iostream.h>

main ( )

char multi [ 5 ] [ 10 ] ;

cout << multi << endl ;

cout << *multi ;

cout << **multi ;

main ( ) { int multi [ 5 ] [ 6 ] ; int row , col ; int *ptr ; ptr = *multi ; for ( row = 0 ; row < 5 ; row ++ ) { for ( col = 0 ; col < 10 ; col ++ ) { multi [ row ] [ col ] = row * col ; } } Example 3

Example 3

for ( row = 0 ; row < 5 ; row ++ )

for ( col = 0 ; col < 10 ; col ++)

cout << *( ptr ++ ) << “ ”;

cout << endl ;

Array of Pointers

Array of Pointers char *myArray [ 10 ] ;

myArray is an array of 10 pointer to

character

Storing Pointers in Array of Pointers

int *p1 , *p2 , *p3 ;

int *b [ 3 ] ;

b [ 0 ] = p1 ;

b [ 1 ] = p2 ;

b [ 2 ] = p3 ;

Command Line Arguments

argc argv ‘argc’ stands for a count of the number of arguments ‘argv’ stands for a vector of arguments

**Example 5 main ( ) { const char suit [ 4 ]= { "Spades“ , "Hearts“ , "Diamonds“ , "Clubs“ } ; const char face [ 13 ] = { "Ace“ , "Deuce“ , "Three“ , "Four", "Five“ , "Six“ , "Seven“ , "Eight“ , "Nine“ , "Ten“ , "Jack“ , "Queen“ , "King" } ; int deck [ 4 ] [ 13 ] = { 0 } ; srand ( time ( 0 ) ) ; shuffle ( deck ) ; deal ( deck , face , suit ) ; }

Shuffle Functions void shuffle ( int wDeck [ ] [ 13 ] ) { int row , column , card ; for ( card = 1 ; card <= 52 ; card ++ ) { do { row = rand ( ) % 4 ; column = rand ( ) % 13 ; } while( wDeck[ row ]| column ] != 0 ) ; wDeck [ row ] [ column ] = card ; } }