Array_C++_programming_example_and reviews2

Ice Breaker
Food Would
You Rather
What's your bucket list?

Agenda Array:
• Definition & Example
• Sorting array
2D-Array:
• Definition & Example
• Practice

What is array? Its example in real life?
Array is an indexed sequence of elements, all the same type.

Example of array,
multi-array:
• Book pages
• A dozen of eggs
• An excel sheet

How to declare an array?
Data type array name [size];
int array[4];
Initialize array
int array [3] = {3, 4,5};
int array[3] ;
array[0] = 3;
array[1] = 4;
array[2] =5;
Accessing array
For loop

1. for(i=0;i<n;i++) {
2. for(j=i+1;j<n;j++) {
3. if(arr[i]>arr[j]) {
4. temp =arr[i];
5. arr[i]=arr[j];
6. arr[j]=temp;
7. }
8. }
9. }
1. int size = 5;
2. int array[size] = {4, 5, 1, 3, 9};
3. temp=0; int i=0;
4. int j=size- 1;
5. while( i < j){
6. temp = array[i];
7. array[i] = array[j];
8. array[j] = temp; i++;
9. j--;
10. }
Sort ascending order
1. for(i=0;i<n;i++) {
2. for(j=i+1;j<n;j++) {
3. if(arr[i]<arr[j]) {
4. temp =arr[i];
5. arr[i]=arr[j];
6. arr[j]=temp;
7. }
8. }
9. }
Sort descending order
Reverse array

Multi-
dementional
Array
• How to initialize a 2D
array?
Data type array_name
[row][col]
int 2Darray [3][3]
Input data: same as 1D array

Practice
what is the value of sum after this code executes?
1. int[][] matrix = {{1,1,2,2},{1,2,2,4},{1,2,3,4},{1,4,1,2}};
2. int sum = 0;
3. int col = matrix[0].length - 2;
4. for (int row = 0; row < 4; row++) {
5. sum = sum + matrix[row][col];
6. }

Ice breaker
• What's an "old person" thing that you do?

Agenda
- Watch video of passing array as parameter in Function
- Review function definition and its example
- Practice problem

Passing Array as Parameter in Function

C++ Function Declaration
returnType functionName (parameter1, parameter2,...) {
// function body
}
// function declaration
void greet() {
cout << "Hello World";
}

Example
1. #include <iostream>
2. using namespace std;
3. int addition (int a, int b) {
4. int r;
5. r=a+b;
6. return r;
7. }
8. int main () {
9. int z;
10. z = addition (5,3);
11. cout << "The result is " << z;
12. }

Practices
• Write a program that calculates 6^5. Declare your own function to do this.

Practices
Write a program with function to find 3 largest number of an array.
Array size: 8
Input: {7, 12, 9, 15, 19, 32, 56, 70}

Array_C++_programming_example_and reviews2

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