```01: #include <iostream>02: #include <vector>03: #include <cstdlib>04: #include <ctime>06: using namespace std;08: /**09:    Finds an element in a vector10:    @param v the vector with the elements to search11:    @param a the value to search for12:    @return the index of the first match, or -1 if not found13: */14: int linear_search(vector<int> v, int a)15: {  for (int i = 0; i < v.size(); i++)17:       if (v[i] == a) return i;21:    return -1;22: }24: /** 25:    Prints all elements in a vector26:    @param a the vector to print27: */28: void print(vector<int> a)29: {  for (int i = 0; i < a.size(); i++)31:       cout << a[i] << " ";32:    cout << "\n";33: }35: /**36:    Sets the seed of the random number generator.37: */38: void rand_seed()39: {  int seed = static_cast<int>(time(0));41:    srand(seed);42: }44: /** 45:    Computes a random integer in a range.46:    @param a the bottom of the range47:    @param b the top of the range48:    @return a random integer x, a <= x and x <= b49: */50: int rand_int(int a, int b)51: {  return a + rand() % (b - a + 1);  }54: 55: int main()56: {  rand_seed();58:    vector<int> v(20);59:    for (int i = 0; i < v.size(); i++)60:       v[i] = rand_int(1, 100);61:    print(v);62:    cout << "Enter number to search for: ";63:    int n;64:    cin >> n;65:    int j = linear_search(v, n);66:    cout << "Found in position " << j << "\n";67:    return 0;68: }
```