STARTING OUT WITH

STARTING OUT WITH

Judy EtchisonJudy Etchison

Class 4 HonorsClass 4 Honors

2

ObjectivesObjectives

Initialize a two-dimensional array

Find the minimum and maximum

values in a two-dimensional array

Sum the rows and columns of a two

dimensional array

3

Two-dimensional array initializationTwo-dimensional array initialization

58

7 9

6 3

int main (void){ int hours [3] [2] = {{8,5}, {7,9}, {6,3}};// or int hours [3][2] = {8,5,7,9,6,3};

4

Two-dimensional array initializationTwo-dimensional array initialization

08

7 9

6 0

int main (void){ int hours [3] [2] = {{8}, {7,9}, {6}};

int hours [3][2] = {8,7,9,6};

78

9 6

0 0

5

Two-dimensional array initializationTwo-dimensional array initialization

78

9 6

0 0

int hours [3][2] = {8,7,9,6};

cout << hours[1][0]; // displays the nine

6

int main (void){ int Table1 [3] [4] = {{1,2,3,4}, {5,8}, {9,10,11}}; int Table2 [4] [4] = { {10,30,40}, {50,60,70,80}, {90}, {130,140,150,160} };

Write a cout statement to display the 140.

cout << Table2[3][1];

Write a cout statement to display the 80.

cout << Table2[1][3];

p. 440

7

void ShowArray(int [ ][ 4], int);int main (void){ int Table1 [3] [4] = {{1,2,3,4}, {5,8}, {9,10,11}}; // display each array a row at a timeShowArray(Table1,3); return 0;}

void ShowArray(int T[][4], int number)

{for (int row = 0; row < number; row++)

for (int col =0; col < 4; col++)

cout << T[row][col];}

p. 440

8

void ShowArray(int [ ][4], int);int main (void){ int Table2 [4] [4] = { {10,30,40}, {50,60,70,80}, {90}, {130,140,150,160} };// display each array a row at a timeShowArray(Table2,4); return 0; }

void ShowArray(int T[][4], int number)

{for (int row = 0; row < number; row++)

for (int col =0; col < 4; col++)

cout << T[row][col];}

p. 440

9

int main (void){ int Table1 [3] [4] = {{1,2,3,4}, {5,6,7,8}, {9,10,11,12}}; int Table2 [4] [4] = { {10,20,30,40}, {50,60,70,80}, {90,100,110,120}, {130,140,150,160} }; SumArray(Table1,3); }void SumArray(int Array[ ][4], int Rows){ int total=0; for (int X=0; X <Rows; X++) for ( int Y=0; Y <4; Y++) total+=Array[X][Y] ; cout << “the sum is” << total; }

10

int main (void){ int Table1 [3] [4] = {{1,2,3,4}, {5,6,7,8}, {9,10,11,12}}; int Table2 [4] [4] = { {10,20,30,40}, {50,60,70,80}, {90,100,110,120}, {130,140,150,160} }; SumArray(Table2,4); }void SumArray(int Array[ ][4], int Rows){ for (int X=0; X <Rows; X++) for ( int Y=0; Y <4; Y++) total+=Array[X][Y] ; }

11

int main (void){ int Table1 [3] [4] = {{1,2,3,4}, {5,6,7,8}, {9,10,11,12}}; int Table2 [4] [4] = { {10,20,30,40}, {50,60,70,80}, {90,100,110,120}, {130,140,150,160} }; InputData(Table2,4); }

void InputData(int Array[ ][4], int Rows){ for (int X=0; X <Rows; X++) { cout << “enter 4 values for row” << (X +1); for ( int Y=0; Y <4; Y++) cin >> Array[X]Y]; }

12

These are some of the basic functions using a These are some of the basic functions using a

two-dimensional array; we displayed all the two-dimensional array; we displayed all the

contents, totaled all the contents and entered contents, totaled all the contents and entered

data into each element. The last slide is a data into each element. The last slide is a

practice exercise.practice exercise.

13

Assume we have an two-dimensional array Assume we have an two-dimensional array

for the storage of votes for three candidates in for the storage of votes for three candidates in

five different precincts. We make use of five different precincts. We make use of

define constants to make our program a little define constants to make our program a little

more modular.more modular.

#define CANDIDATES 3#define CANDIDATES 3

#define PRECINCTS 5#define PRECINCTS 5

void main()void main()

{ int votes[CANDITATES][PRECINCTS];{ int votes[CANDITATES][PRECINCTS];

} }

14

Write the functions to:Write the functions to:

1. Enter all the votes into the array. 1. Enter all the votes into the array.

2. Find and display the total number of votes2. Find and display the total number of votes

cast for each candidate cast for each candidate

3. Find and display the total number of votes 3. Find and display the total number of votes

cast in each precinct.cast in each precinct.

4. Find the winner of the election.4. Find the winner of the election.

15

int main(){ char Months[12][10] ={“January”, “February”, “March”,

“April”, “May”

“June”,“July”,“August”,“September”,“October”,“November”,“December”};cout << Months[9];

p. 444Program 7-20

16

for (int Count = 0; Count < 12; Count++)

{ cout << Months[Count] << “has”;

cout << Days[Count] << “days.\n”;

}

int Days[12] = { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31, 31};

17

Q & A

STARTING OUT WITH

STARTING OUT WITH

Judy EtchisonJudy Etchison

Conclusion of Conclusion of Class 4Class 4