C++ Arrays and Loops - C++ Tutorial

In C++, arrays are often used with loops to efficiently process multiple elements without manually handling individual values.

Looping Through an Array

Using a for loop, you can iterate through each element in an array.

Example: Displaying Motorcycle Brands

#include <iostream>
using namespace std;

int main() {
    // Create an array of motorcycle brands
    string bikeBrands[5] = {"Yamaha", "Ducati", "Kawasaki", "Honda", "Harley-Davidson"};

    // Loop through the array
    for (int i = 0; i < 5; i++) {
        cout << bikeBrands[i] << "\n";
    }

    return 0;
}

C++
​x
 
#include <iostream>using namespace std;​int main() {    // Create an array of motorcycle brands    string bikeBrands[5] = {"Yamaha", "Ducati", "Kawasaki", "Honda", "Harley-Davidson"};​    // Loop through the array    for (int i = 0; i < 5; i++) {        cout << bikeBrands[i] << "\n";    }​    return 0;}​

Output:

Yamaha  
Ducati  
Kawasaki  
Honda  
Harley-Davidson

C++
 
Yamaha  Ducati  Kawasaki  Honda  Harley-Davidson  ​

Displaying Index Alongside Values

To show the index along with each value, use i within the loop.

Example

#include <iostream>
using namespace std;

int main() {
    string bikeBrands[5] = {"Yamaha", "Ducati", "Kawasaki", "Honda", "Harley-Davidson"};

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

    return 0;
}

C++
 
#include <iostream>using namespace std;​int main() {    string bikeBrands[5] = {"Yamaha", "Ducati", "Kawasaki", "Honda", "Harley-Davidson"};​    for (int i = 0; i < 5; i++) {        cout << i << " = " << bikeBrands[i] << "\n";    }​    return 0;}​

Output:

0 = Yamaha  
1 = Ducati  
2 = Kawasaki  
3 = Honda  
4 = Harley-Davidson

C++
 
0 = Yamaha  1 = Ducati  2 = Kawasaki  3 = Honda  4 = Harley-Davidson  ​

Looping Through an Array of Numbers

Arrays can also store numerical values, such as engine capacities.

Example: Displaying Engine Sizes

#include <iostream>
using namespace std;

int main() {
    int engineSizes[5] = {600, 1000, 1100, 1300, 1500};

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

    return 0;
}

C++
 
#include <iostream>using namespace std;​int main() {    int engineSizes[5] = {600, 1000, 1100, 1300, 1500};​    for (int i = 0; i < 5; i++) {        cout << engineSizes[i] << "\n";    }​    return 0;}​

Output:

C++
 
600  1000  1100  1300  1500  ​

The For-Each Loop (Range-Based Loop)

Introduced in C++11, the for-each loop (or range-based for loop) simplifies iteration by automatically handling each array element.

Syntax

for (type variableName : arrayName) {
    // Code to execute for each element
}

C++
 
for (type variableName : arrayName) {    // Code to execute for each element}​

Example: Iterating Over Engine Sizes

#include <iostream>
using namespace std;

int main() {
    int engineSizes[5] = {600, 1000, 1100, 1300, 1500};

    for (int cc : engineSizes) {
        cout << "Engine displacement: " << cc << "cc\n";
    }

    return 0;
}

C++
 
#include <iostream>using namespace std;​int main() {    int engineSizes[5] = {600, 1000, 1100, 1300, 1500};​    for (int cc : engineSizes) {        cout << "Engine displacement: " << cc << "cc\n";    }​    return 0;}​

Example: Iterating Over Motorcycle Brands

#include <iostream>
using namespace std;

int main() {
    string bikeBrands[5] = {"Yamaha", "Ducati", "Kawasaki", "Honda", "Harley-Davidson"};

    for (string brand : bikeBrands) {
        cout << "Brand: " << brand << "\n";
    }

    return 0;
}

C++
 
#include <iostream>using namespace std;​int main() {    string bikeBrands[5] = {"Yamaha", "Ducati", "Kawasaki", "Honda", "Harley-Davidson"};​    for (string brand : bikeBrands) {        cout << "Brand: " << brand << "\n";    }​    return 0;}​