NOIP2010-普及组复赛-第一题-数字统计

 1 #include <stdio.h>
 2 int main()
 3 {
 4     int n,m,i,k;
 5     int ans=0;
 6     //freopen("two.in","r",stdin);
 7     //freopen("two.out","w",stdout);
 8     scanf("%d%d",&n,&m);
 9     for(i=n;i<=m;i++)
10     {
11         k=i;
12         while(k>0)
13         {
14             if(k%10==2) ans++;
15             k=k/10;
16         }
17     }
18     printf("%d\n",ans);
19     return 0;
20 }