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#include <iostream>
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#include <ctime>
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#include <cstdlib>
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using namespace std;
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// 设置随机整数的种子
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void rand_seed()
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{
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unsigned int seed = static_cast<unsigned int>(time(0));
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srand(seed);
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}
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// 返回一个介于lower与upper之间的一个随机整数
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int randInt(int lower, int upper)
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{
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return lower + rand() % (upper - lower + 1);
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}
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void print(const int a[], const int length)
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{
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for (int i = 0; i < length; i++)
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cout << a[i] << " ";
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cout << endl;
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}
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// 如果待查找数字存在于数组中，则返回其下标；否则返回-1
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int linear_search(const int a[], const int length, int num)
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{
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for (int i = 0; i < length; i++)
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{
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if (a[i] == num)
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return i;
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}
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return -1;
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}
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int main()
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{
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const int length = 20;
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const int lower = 1; // 随机数上限
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const int upper = 1000; // 随机数下限
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int a[length];
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int num; // 待查找的数字
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for (int i = 0; i < length; i++)
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a[i] = randInt(lower, upper);
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print(a, length);
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cout << "请输入要查找的数字：";
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while (cin >> num)
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{
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int num_index = linear_search(a, length, num);
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if (num_index != -1)
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cout << "a[" << num_index << "] = " << a[num_index] << endl;
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else
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cout << "未找到" << endl;
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cout << "请输入要查找的数字：";
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}
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return 0;
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}
