CS201-16 - Introduction to Programming Introduction to...

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Unformatted text preview: Introduction to Programming Introduction to Programming Lecture 16 In Today Lecture In Today Lecture Conclude the last discussion Multi­dimensional Arrays Pointers to Pointers Example 1 Example 1 char myName [ ] = “Amir” ; char *myNamePtr = “Amir” ; Multi­dimensional Arrays Multi­dimensional Arrays char multi [ 5 ] [ 10 ] ; Multi­dimensional Array in Memory Multi­dimensional Array in Memory Placed sequentially in the memory [0] [1] [2] [3] [4] [0] [1] [2] [3] [4] [0] [1] [2] [3] [4] 1 2 3 4 10 7 9 11 14 10 17 25 39 45 58 1st row 1st col 2nd row 1st col 3rd row 1st col Dereferencing array element Dereferencing array element multi [ 2 ] [ 3 ] *multi ? Example 2 Example 2 #include<iostream.h> main ( ) { char multi [ 5 ] [ 10 ] ; cout << multi << endl ; cout << *multi ; cout << **multi ; } multi + 3 multi + 3 *( multi + 3 ) *( multi + 3 ) + 3 *(*( multi + 3 ) + 3 ) main ( ) 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 Example 3 for ( row = 0 ; row < 5 ; row ++ ) { for ( col = 0 ; col < 10 ; col ++) { cout << *( ptr ++ ) << “ ”; } cout << endl ; } } Pointer to a Pointer to a Pointer Array of Pointers Array of Pointers Array of Pointers Array of Pointers char *myArray [ 10 ] ; myArray is an array of 10 pointer to character Initialization Initialization char *myArray [ ] = { “Amir ” , “ Jahangir ” } ; Storing Pointers in Array of Pointers 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 Command Line Arguments argc argv ‘argc’ stands for a count of the number of arguments ‘argv’ stands for a vector of arguments Example 4 Example 4 main ( int argc , char **argv ) { cout << argc << "\n“ << *argv ; } Example 5 Example 5 main ( ) { const char *suit [ 4 ]= { "Spades“ , "Hearts“ , const char *face [ 13 ] = { "Ace“ , "Deuce“ , "Three“ , "Four", "Diamonds“ , "Clubs“ } ; "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 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 ; } } Deal Function Deal Function void deal ( const int wDeck [ ] [ 13 ] , const char *wFace [ ] , const char *wSuit [ ] ) { int card , row , column ; for ( card = 1 ; card <= 52 ; card ++ ) { for ( row = 0 ; row <= 3 ; row++ ) { for ( column = 0 ; column <= 12 ; column ++ ) { if ( wDeck [ row ] [ column ] == card ) // Print the face and suit of the card // break out of loops } } } } What we have done today What we have done today Multi­dimensional Arrays Pointers to Pointers Arrays of Pointers Command Line Arguments Comprehensive Example ...
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