Flash cards
Review the key moves
What is the main idea behind C++ Arrays and Loops?
Lesson checks
Practice each idea before moving on
Short Mimo-style checks built from this lesson's code, terms, and sequence.
Which statement best captures the main point of this lesson?
Complete the missing token from the example code.
// ___ an array of strings string cars[5] = {"Volvo", "BMW", "Ford", "Mazda", "Tesla"}; // Loop through stringsPut the learning moves in the order that makes the concept easiest to apply.
Loop Through an Array
You can loop through the array elements with the for loop.
The following example outputs all elements in the cars array:
Example
// Create an array of strings string cars[5] = {"Volvo", "BMW", "Ford", "Mazda", "Tesla"}; // Loop through strings
for (int i = 0; i < 5;
i++) {
cout << cars[i] << "\n";
}This example outputs the index of each element together with its value:
Example
string cars[5] = {"Volvo", "BMW", "Ford", "Mazda", "Tesla"};
for (int i = 0; i < 5;
i++) {
cout << i << " = " << cars[i] << "\n";
}And this example shows how to loop through an array of integers:
Example
int myNumbers[5] = {10, 20, 30, 40, 50};
for (int i = 0; i < 5; i++) {
cout << myNumbers[i] << "\n";
}The foreach Loop
There is also a " for-each loop" (introduced in C++ version 11 (2011)), which is used exclusively to loop through elements in an array (and other data structures, like vectors and lists ):
Syntax
for ( type variableName
: arrayName ) {
// code block to be executed
}The following examples output all elements in an array using a " for-each loop":
Example
// Create an array of integers int myNumbers[5] = {10, 20, 30, 40, 50}; // Loop through integers
for (int num : myNumbers) {
cout << num << "\n";
}Example
// Create an array of strings string cars[5] = {"Volvo", "BMW", "Ford", "Mazda", "Tesla"}; // Loop through strings
for (string
car : cars) {
cout << car << "\n";
}