Arrays

#include <iostream>
using namespace std;

int main() {
    int marks[5] = {67, 82, 91, 58, 74};
    int total = 0;
    for (int i = 0; i < 5; i++) {
        total += marks[i];
    }
    cout << "Average: " << (double)total / 5 << endl;
    cout << "Third mark: " << marks[2] << endl;
    return 0;
}

#include <iostream>
using namespace std;

int main() {
    int n;
    cin >> n;
    int a[100];
    for (int i = 0; i < n; i++) cin >> a[i];

    int lo = a[0], hi = a[0];
    for (int i = 1; i < n; i++) {
        if (a[i] < lo) lo = a[i];
        if (a[i] > hi) hi = a[i];
    }
    cout << "min " << lo << ", max " << hi << endl;
    return 0;
}

#include <iostream>
using namespace std;

void printArray(int arr[], int n) {
    for (int i = 0; i < n; i++) cout << arr[i] << " ";
    cout << endl;
}

void doubleAll(int arr[], int n) {
    for (int i = 0; i < n; i++) arr[i] *= 2;
}

int main() {
    int v[4] = {1, 2, 3, 4};
    doubleAll(v, 4);      // arrays are not copied: the original changes
    printArray(v, 4);
    return 0;
}

#include <iostream>
using namespace std;

int main() {
    int a[6] = {29, 10, 14, 37, 13, 5};
    int n = 6;
    for (int pass = 0; pass < n - 1; pass++) {
        for (int i = 0; i < n - 1 - pass; i++) {
            if (a[i] > a[i + 1]) {
                int t = a[i];
                a[i] = a[i + 1];
                a[i + 1] = t;
            }
        }
    }
    for (int i = 0; i < n; i++) cout << a[i] << " ";
    cout << endl;
    return 0;
}

#include <iostream>
using namespace std;

int main() {
    int m[3][4];
    for (int r = 0; r < 3; r++)
        for (int c = 0; c < 4; c++)
            m[r][c] = (r + 1) * (c + 1);

    for (int r = 0; r < 3; r++) {
        for (int c = 0; c < 4; c++) cout << m[r][c] << "\t";
        cout << endl;
    }
    return 0;
}