四则运算

//四则运算法则
//Limin,Mar 6
#include<iostream>
using namespace std;
void main()
{

    int i,a[30],b[30],c;
    char mm;
  for(i=0;i<30;i++)
{
    a[i]=rand()%30+1;
    b[i]=rand()%30+1;
}
do
{
    cout<<"**************************请输入你要进行的运算方式:***********************"<<endl;
    cout<<" 1、加法 2、减法 "<<endl;
    cout<<" 3.乘法 4.除法 "<<endl;
    cout<<"**************************************************************************"<<endl;
    cin>>c;
switch(c)
{

case 1: 
    cout<<" 加法运算: "<<endl;
  for(i=1;i<=30;i++)
    cout<<a[i]<<"+"<<b[i]<<"="<<‘\t‘;break;
case 2: 
    cout<<" 减法运算: "<<endl;
  for(i=1;i<=30;i++)
    cout<<a[i]<<"-"<<b[i]<<"="<<‘\t‘;break;
case 3: 
    cout<<" 乘法运算: "<<endl;
  for(i=1;i<=30;i++)
    cout<<a[i]<<"*"<<b[i]<<"="<<‘\t‘;break;
case 4: 
    cout<<" 除法运算: "<<endl;
  for(i=1;i<=30;i++)
    cout<<a[i]<<"/"<<b[i]<<"="<<‘\t‘;break;
}
for(i=0;i<30;i++)
{

     if(i%10==0)
    cout<<endl;
}
    cout<<endl;
    cout<<"*************************************************************"<<endl;
    cout<<" 继续请输入Y 退出请输入N "<<endl;
    cout<<"*************************************************************"<<endl;
    cin>>mm;
}while(mm==‘y‘||mm==‘Y‘);
}