程序代码：

// Note:Your choice is C++ IDE
#include <iostream>
using namespace std;
int main()
{
    char choose;
    int  counter;
    counter=0;
    cout<<"please input some char.\n";
    do
    {
        cin.get(choose);              //接受空白字符
        if(choose>=48&&choose<=57)   //判断是数字
           counter++;
    }while(choose!='\n');
    cout<<"the all number is\n"<<counter;
    getchar();
    return 0;
}