1021 个位数统计

 

#include<iostream>
using namespace std;
#include<string>
int main()
{
	string str;
	cin >> str;
	int a = str.length();
	int arr[10] = { 0,0,0,0,0,0,0,0,0,0 };
	for (int i = 0; i < a; i++)
	{
		switch (str[i] - '0')
		{
		case 0: {arr[0]++; break; }
		case 1: {arr[1]++; break; }
		case 2: {arr[2]++; break; }
		case 3: {arr[3]++; break; }
		case 4: {arr[4]++; break; }
		case 5: {arr[5]++; break; }
		case 6: {arr[6]++; break; }
		case 7: {arr[7]++; break; }
		case 8: {arr[8]++; break; }
		case 9: {arr[9]++; break; }
		}
	}
	for (int i = 0; i < 10; i++)
	{//0:2
		if (arr[i] != 0)
		{
			cout << i << ":" << arr[i] << endl;
		}
	}
	system("pause");
}