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Find the Largest Number in an Array in C++

In this exercise, you will implement a function that finds the largest number in an array. This task is useful when working with datasets where you need to extract the maximum value.

The function should loop through the array, compare each element, and track the largest number encountered. This will help you practice array manipulation and conditional statements in C++.

Group

Arrays and Vectors in C++

Objective

1. Define an array with several integer values.
2. Implement a function that iterates through the array.
3. Compare each element of the array with the current largest number.
4. Update the largest number whenever a larger value is found.
5. After the loop, return or print the largest number.
6. Test the program with different arrays to ensure its accuracy.

Implement a function that finds the largest number in an array.

Example C++ Exercise

 Copy C++ Code 
#include <iostream> // Include iostream for input and output
using namespace std; // Use the standard namespace

// Function to find the largest number in the array
int findLargestNumber(int arr[], int size) {
    int largest = arr[0]; // Assume the first element is the largest

    // Loop through the array starting from the second element
    for (int i = 1; i < size; i++) {
        if (arr[i] > largest) { // If the current element is larger than the current largest
            largest = arr[i]; // Update the largest number
        }
    }

    return largest; // Return the largest number found
}

int main() {
    // Define an array of numbers
    int numbers[] = {15, 22, 4, 67, 30, 90, 12};
    int size = sizeof(numbers) / sizeof(numbers[0]); // Calculate the size of the array

    // Call the function to find the largest number
    int largest = findLargestNumber(numbers, size);

    // Output the largest number
    cout << "The largest number in the array is: " << largest << endl;

    return 0; // End of program
}

 Output

The largest number in the array is: 90

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