直方图

 1 #include <iostream>
 2 #include <string>
 3 #include <algorithm>
 4 using namespace std;
 5 
 6 int main(){
 7     string a;
 8     while (cin >> a){
 9         int i, j, max = 0, num[10] = { 0 };
10         for (i = 0; i<a.length(); i++) 
11             num[a[i] - '0']++;
12         for (i = 0; i<10; i++)
13         if (num[i]>max)
14             max = num[i]; //找到最大次数，即柱状图层数
15         for (i = max; i>0; i--){ 
16             for (j = 0; j<10; j++){ 
17                 if (i>num[j])
18                     cout << ' '; else cout << '*';
19             }
20             cout << endl;
21         }
22         cout << "0123456789" << endl; //标出横轴
23     }
24     return 0;
25 }