C语言while循环的问题

#include
int main( )
{
    int num,sum=0;
    while(1)
    {
        printf("数值：");
        scanf("%d",&num);
        if(num<0)
        {
            printf("输入错误\n");
            break;
        }
        sum=sum+num;
        if(sum>10)
        {
            printf(" 和：%d\n",sum);
            break;
        }
    }
    return 0;
}