C++ Lessons : 18.1. Loop Through an Array

[quix]

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

string cars[5] = {"Volvo", "BMW", "Ford", "Mazda", "Tesla"};
for (int i = 0; i < 5; i++) {
  cout << cars << "\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 << "\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 << "\n";
}
 

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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:

Syntax

for (type variableName : arrayName) {
  // code block to be executed
}
 

The following example outputs all elements in an array, using a "for-each loop":

Example

int myNumbers[5] = {10, 20, 30, 40, 50};
for (int i : myNumbers) {
  cout << i << "\n";
}