6. Arrays

Arrays

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Reading 1

A row of boxes with one name

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An array holds several values of the same type under one name. You pick the size when you declare it.

Indexes start at 0. For an array of size 5, valid indexes are 0, 1, 2, 3, and 4.

You can initialize values in braces. Use a for loop to walk every element.

int nums[5] = {10, 20, 30, 40, 50};
cout << nums[0] << endl;  // 10
cout << nums[4] << endl;  // 50

for (int i = 0; i < 5; i++) {
    cout << nums[i] << " ";
}

Check 2

First index

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In int a[4] = {2, 4, 6, 8}; what is a[0]?

Fill in 3

Indexing

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Try it 4

Print an array

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Run this. Change one value in the initializer and run again.

main.cpp

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Program input (stdin)

Output will appear here.

Assignment 5

Sum of five numbers

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Read five integers into an array. Print their sum, followed by a newline.

main.cpp

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Pass by reference Traversing and searching arrays