刚学，说不清楚，下面出代码，其中除数我要求   （b==0 && a/b!=0）a/b!=0的意思好像是不被整除的意思吧？难道我理解错误，看编码~~~

===============================================================================================================
#include "iostream.h"
#include "stdlib.h"
#include "time.h"
int main()
{
    int a,b;
    float numOfQues=0,numOfRight=0;
    char inquiry;
    srand(time(NULL));
    cout<<"欢迎来计算两位数的加减法运算!"<<endl;
    do
    {
        int temp=3;//为了测试除数正确性，特意改成3的
        a=rand()%10;//产生一个10以内的随机数
        b=rand()%10;//产生一个10以内的随机数
        switch (temp)
        {
        case 0:
            {
                int ans;//用来存放答案
                cout<<a<<'+'<<b<<'=';
                cin>>ans;
                if (ans==a+b)
                {
                    numOfRight++;
                    cout<<"恭喜你答对了!"<<endl;
                }
                else cout<<"很遗憾答错了，加油!"<<endl;
                break;
            }
        case 1:
            {
                int ans;
                cout<<a<<'-'<<b<<'=';
                cin>>ans;
                if (a>b)
                {
                    continue;
                }
                else
                {
                    if (ans==a-b)
                    {
                        numOfRight++;
                        cout<<"恭喜你答对了!"<<endl;
                    }
                    else cout<<"很遗憾答错了，加油!"<<endl;
                    break;
                }
            }
        case 2:
            {
                int ans;
                cout<<a<<'*'<<b<<'=';
                cin>>ans;
                if (ans==a*b)
                {
                    numOfRight++;
                    cout<<"恭喜你答对了!"<<endl;
                }
                else cout<<"很遗憾答错了，加油!"<<endl;
                break;
            }
        case 3:
            {
                int ans;
                cout<<a<<'/'<<b<<'=';
                cin>>ans;
                if (b==0 && a/b==0)
                {
                    break;
                }
                else
                {
                    if (ans=a/b)
                    {
                        numOfRight++;
                        cout<<"恭喜你答对了!"<<endl;
                    }
                    else cout<<"很遗憾答错了，加油!"<<endl;
                    break;
                }
            }
        }
        numOfQues++;
        cout<<"还要再做吗一个题吗?"<<endl;
        cin>>inquiry;
    }while (inquiry!='n'&&inquiry!='N');
    cout<<"你的答题正确率为:"<<numOfRight*100/numOfQues<<"%。再见!"<<endl;
    return 0;
}

b 要是 0 的话，你怎么可能还让它当除数呢？

                if (b==0 && a/b==0)
                {
                    break;
                }

这里不是说，如果 （b==0 与 a/b==0） 的话
                    打断循环；

不是这个意思么？我是这样理解的

即使已知b==0,还是会继续运算a/b==0。。因为与关系嘛~~

[ 本帖最后由 naruto01 于 2011-8-15 11:07 编辑 ]

无论是b==0   还是 a/b==0
运行的结果都是break；
都是打断啊；

他们之间关系是“与”额？

“与”就是 且 的意思。程序都不用看，就这一个语句就有问题。