#include<iostream.h>
#include<stdlib.h>
int Rand(int,int);
void main()
{
    int a,b,c,d,i,j=0,m,n,x;
    char op,as;
    while(1){
        cout<<"请问是否进行练习，是请按Y，否请按N;";
        cin>>as;
        if(as=='n'||as=='N') break;
        cout<<"现在开始进行练习，请选择练习的难度，请选1或2;"<<endl;
        cin>>x;
        if(x=1) m=0,n=10;
        else m=10,n=100;
        while(1){
        cout<<"请选择运算的类型,+,-,*,/,混合类型请按h"<<endl;
        cin>>op;
        if(op != '+' && op != '-' && op != '*' && op != '/' && op!='h' && op!='H') {cout<<"输入有误，请得新输入：";  
        continue;}
        else break;
        }
        while(i=0,i>10,i++){
            if(op=='h'||op=='H') switch(rand()%4)
            {case 0: op='+';break;
            case 1: op='-';break;
            case 2: op='*';break;
            case 3: op='/';break;
            }
            while(1){
                a=Rand(m,n),R=Rand(m,n);
                if(op=='-') if(a<b) continue;
                if(op=='/') if(int( a / b ) != (a / b) ||b==0) continue;
                break;
                switch(op)
                {case'+': d=a+b;break;
                case'-': d=a-b;break;
                case'*': d=a*b;break;
                case'/': d=a/b;break;
                }
                cout<<"请输入答案"<<a<<op<<b<<'='<<endl;
                cin>>c;
                if(c==d){j++;cout<<"答对了，加十分"<<endl;}
                else cout<<"答错了！"<<endl;
            }
            cout<<"你的分数为："<<10*j<<'分'<<endl;
        }
    int Rand(int m, int n)
{ static int r;            //静态变量保留上一个随机数
  do
    { r = ( 25173*r + 13849 ) % 65536 ;}
  while (r<m||r>=n);
  return r;
}

[[it] 本帖最后由 夜无涯 于 2009-7-23 10:47 编辑 [/it]]