希望各位能够看一下，我迫切需要

#include<iostream>
using namespace std;
int main()
{
    int a;
    while (scanf_s("%d", &a) != EOF)
    {
        if(a > 0 && a < 10)
            cout<<10 * a;
        else
            cout<<"不是数字";
    }
    return 0;
}

#include <stdio.h>
void main(void)
{
    int a;
    while(scanf("%c",&a) != EOF){
        getchar();
        if(a == '0') break;
        if(a>='1' && a<='9')
            printf("%c0\n",a);
        else
            printf("No digit.\n");
    }
}