第二次代码

/*2016/3/11
1.题目避免重复/
2.可定制（数量/打印方式）
3.可以控制下列参数
   *是否有乘除法
   *是否有括号（最多可支持10个数参与计算）
   *数值范围
   *加减有无负数
   *除法有无余数
没有实现括号的运算，加不进去了：（
   */
#include<iostream>
#include<fstream>
#include<time.h>
#include<stdlib.h>
#include<math.h>
using namespace std;
void main()
{
    ofstream outfile;
    outfile.open("题目.txt");
    int num1,num2,num3,num4,num,c,d,f;
    char y;
    int xZ[3];
    int range;
    srand((int)time(0));         // 时间种子
    cout<<"选择打印方式：（1代表屏幕，0代表文件）：";
    cin>>f;
    cout<<"输入题目的数量：";
    cin>>num;
    cout<<"整数数值范围:(1000以内,100以内,10以内)";
        cin>>range;
        while(range!=10&&range!=100&&range!=1000)
        {
            cout<<"请输入10,100,或1000:";
            cin>>range;
        }
    cout<<"是否有乘除法，有输入1，没有输入0：";
    cin>>xZ[0];
    cout<<"加减有无负数，有输入1，没有输入0：";
    cin>>xZ[1];
    if(xZ[0]==1)
    {
        cout<<"除法有无余数，有输入1，没有输入0：";
        cin>>xZ[2];
    }
   
    for(int i=0;i<num;i++)//输出题目的循环
    {
        num1=rand()%range;
        num2=rand()%range;
        num3=rand()%range;
        num4=rand()%range;
        c=1+(int)(4*rand()/(RAND_MAX+1.0));
        d=1+(int)(2*rand()/(RAND_MAX+1.0));
        if(d%2==0)//随机确定整数运算还是真分数运算
        {
        if(xZ[0]==1)//确定是否有乘除
        {
            if(c%4==0)//除法
            {
                if(xZ[2]==0)//是否有余数
                {
                    if(num1%num2==0)
                        {
                            if(f==1)
                        cout<<num1<<"/"<<num2<<"="<<endl;
                        else
                        outfile<<num1<<"/"<<num2<<"="<<endl;
                       }
                    else
                    {
                        while(num1%num2!=0)
                        {
                            num1=rand()%range;
                           num2=rand()%range; 
                        }
                      
                        if(f==1)
                        cout<<num1<<"/"<<num2<<"="<<endl;
                        else
                        outfile<<num1<<"/"<<num2<<"="<<endl;

                    }
                }
                else  
                    
                {
                        if(f==1)
                        cout<<num1<<"/"<<num2<<"="<<endl;
                        else
                        outfile<<num1<<"/"<<num2<<"="<<endl;
                }
                
            } 
             if(c%4==2)//减法
             {
                if(xZ[1]==0)//是否有负数
                 {
                  if(num1<num2)
                      
                {
                        if(f==1)
                        cout<<num2<<"-"<<num1<<"="<<endl;
                        else
                        outfile<<num2<<"-"<<num1<<"="<<endl;
                  }
                  else
                      if(f==1)
                       cout<<num1<<"-"<<num2<<"="<<endl;
                      else
                       outfile<<num1<<"-"<<num2<<"="<<endl;
                 }
              else
                 if(f==1)
                  cout<<num1<<"-"<<num2<<"="<<endl;
                 else
                  outfile<<num1<<"-"<<num2<<"="<<endl;
             }
            if(c%4==1)
                 if(f==1)
                  cout<<num1<<"+"<<num2<<"="<<endl;
                 else
                  outfile<<num1<<"+"<<num2<<"="<<endl;
            
            if(c%4==3) 
                 if(f==1)
                  cout<<num1<<"*"<<num2<<"="<<endl;
                 else
                  outfile<<num1<<"*"<<num2<<"="<<endl;
                
        }                                  
        else//无乘除
        {
            if(c%2==0)//减法
            {
              if(xZ[1]==0)//是否有负数
              {
                  if(num1<num2) 
                 {
                 if(f==1)
                  cout<<num2<<"-"<<num1<<"="<<endl;
                 else
                  outfile<<num2<<"-"<<num1<<"="<<endl;
                  }
                  else
                      {
                 if(f==1)
                  cout<<num1<<"-"<<num2<<"="<<endl;
                 else
                  outfile<<num1<<"-"<<num2<<"="<<endl;
                  }
              }
              else
                   {
                 if(f==1)
                  cout<<num1<<"-"<<num2<<"="<<endl;
                 else
                  outfile<<num1<<"-"<<num2<<"="<<endl;
                  }
            }

            if(c%2==1)
                 {
                 if(f==1)
                  cout<<num1<<"+"<<num2<<"="<<endl;
                 else
                  outfile<<num1<<"+"<<num2<<"="<<endl;
                  }
                                        
        }
       
    }
        else//真分数运算
        {    
             switch(c%4)//判断运算符
          {
             case(0):y=‘+‘;break;
             case(1):y=‘-‘;break;
             case(2):y=‘*‘;break;
             case(3):y=‘/‘;break;
          }
            if(num1>num2)//判断大小，组合成真分数，并确保分母不为0
                {
                 if(f==1)
                  cout<<"("<<num2<<"/"<<num1<<")";
                 else
                  outfile<<"("<<num2<<"/"<<num1<<")";
                  }
            else
            {
                if(num2==0)
            { 
                do{num2=rand()%range;} while(num2==0);
            }    
                 if(f==1)
                  cout<<"("<<num1<<"/"<<num2<<")";
                 else
                  outfile<<"("<<num1<<"/"<<num2<<")";
                  
            }
            
                 if(f==1)
                 cout<<y;
                 else
                  outfile<<y;
            if(num3>num4)
            {
                 if(f==1)
                  cout<<"("<<num4<<"/"<<num4<<")";
                 else
                  outfile<<"("<<num4<<"/"<<num4<<")";
            }
            
            else    
            {
                if(num4==0)
            { 
                do{num4=rand()%range;} while(num4==0);
            }
                
                 if(f==1)
                 cout<<"("<<num3<<"/"<<num4<<")";
                 else
                  outfile<<"("<<num3<<"/"<<num4<<")";
            
            
            }
             if(f==1)
                 cout<<"="<<endl;
              else
                  outfile<<"="<<endl;
            
        }

       }
       outfile.close();
    }