敲七游戏 （C语言代码）

解题思路:

注意事项:

参考代码:

                #include<stdio.h>
                int main()
                {
                     int N,i,count=0,temp;
                     scanf("%d",&N);
                     for(i=7;i<=N;i++)
                     {
                              if(i%7==0)                   // 被7整除
                              {
                                   count++;
                                   continue;
                              }
                              temp=i;                        //这一步要注意，不能用i去做变量，否则for循环会出错
                              while(temp)
                              {  
                                   if(temp%10==7)     //数字内含7
                                   {
                                        count++;
                                        break;
                                   } 
                                   temp=temp/10; 
                              }
                         }
                 printf("%d",count);
                 return 0;
                }