#include<iostream>
#include<iomanip>
#include<ctime>
using namespace std;
int add_test(){
	int x,y,z,f,c=0,score=0;
	time_t t;
	srand(time(&t));
	f=rand()%51;
	cout<<"加法测验（共 n 题）"<<endl;
	for(int i=0;i<=f;i++){
		c++;
		x=rand()%21;
		y=rand()%21;
		cout<<c<<"、"<<setw(2)<<x<<" + "<<setw(2)<<y<<" = ";
		cin>>z;
		if(x+y==z)
			score += 10;
	}
	return score;
}
int sub_test(){
	int x,y,z,f,c=0,score=0;
	time_t t;
	srand(time(&t));
	f=rand()%31;
	cout<<"减法测验（共 n 题）"<<endl;
	for(int i=0;i<=f;i++){
		c++;
		x=rand()%51;
		y=rand()%21;
		cout<<c<<"、"<<setw(2)<<x<<" - "<<setw(2)<<y<<" = ";
		cin>>z;
		if(x-y==z)
			score += 10;
	}
	return score;
}
int chn_test(){
	int x,y,z,f,c=0,score=0;
	time_t t;
	srand(time(&t));
	f=rand()%21;
	cout<<"乘法测验（共 n 题）"<<endl;
	for(int i=0; i<=f;i++){
		c++;
		x=rand()%21;
		y=rand()%11;
		cout<<c<<"、"<<setw(2)<<x<<" * "<<setw(2)<<y<<" = ";
		cin>>z;
		if(x*y==z)
			score += 10;
	}
	return score;
}
int chu_test(){
	int x,y,z,f,c=0,score=0;
	time_t t;
	srand(time(&t));
	f=rand()%11;
	cout<<"除法测验（共 n 题）"<<endl;
	for(int i=0;i<=f;i++){
		c++;
		x=rand()%51;
		y=rand()%11;
		cout<<c<<"、"<<setw(2)<<x<<" ÷ "<<setw(2)<<y<<"="<<" ";
		cin>>z;
		if(x/y==z)
			score += 10;
	}
	return score;
}