int plus_one(int number) {
  return number + 1;
}

int a = 3, b = 5;
std::swap(a, b);
std::cout << a << ' ' << b << "\n";

void

void print_hello() {
  std::cout << "hello\n";
}

int sum_2d_array(int arr[][100], int n, int m) {
  int sum = 0;
  for (int i = 0; i < n; i++)
    for (int j = 0; j < m; j++)
      sum += arr[i][j];
  return sum;
}

int arr[100][100];
int sum = sum_2d_array(arr, 100, 100);

void swap(int a, int b) {
  int c = a;
  a = b;
  b = c;
}

int a = 3, b = 5;
swap(a, b);
std::cout << a << ' ' << b << "\n";

void swap(int a, int b) {
   ...
}
 
int c = 3, d = 5;
swap(c, d);

void swap(int& a, int& b) {
  int c = a;
  a = b;
  b = c;
}

int a = 3, b = 5;
swap(a, b);
std::cout << a << ' ' << b << "\n";

void swap(int& a, int& b) {
   ...
}
 
int c = 3, d = 5;
swap(c, d);

void plus_one(int arr[]) {
   arr[0]++;
}
 
int arr[10] = {0};
plus_one(arr);
std::cout << arr[0] << "\n";

int increment(int num, int delta=1) {
   return num + delta;
}
 
int n = 3;
int inc1 = increment(n);
int inc2 = increment(n, 2);

int increment(int num, int delta=1);

int increment(int delta=1, int num);

int divide(int a, int b) {
  if (b == 0)
    return -1;
  return a / b;
}

void print() {
  return;
  std::cout << "will not print\n";
}

int get_one() {
  return 1;
}

int one = get_one();
std::cout << one << "\n";

int quadratic(int a, int b, int c) {
  // solve...
  return x1, x2;
}

void swap(int a, int b);
 
int main() {
  int a = 3, b = 5;
  swap(a, b);
}
 
void swap(int a, int b) {
  ...
}

int find_max_and_min_and_median(int arr[]);

int find_max(int arr[]);
 
int find_min(int arr[]);
 
int find_median(int arr[]);