爆打小组,四则运算,算法实现

组长严一格在讨论中说明了算法的需求,先实现了分5级难度,简单随机生成题目的算法.

#include<cstdio>
#include<cstdlib>
#include<ctime>
#include<iostream>
using namespace std;
class Random{
public:
    void init(){
        srand(time(0));
    }
    ///return number in [x,y]
    int random_number_in(int x,int y){
        return x+rand()%(y-x+1);
    }
}myrandom;
class Number{
    int cutoff[8]={10,20,50,100,500};
    char buffer[16];
public:
    string get(int n){
        int x=myrandom.random_number_in(1,cutoff[n-1]);
        sprintf(buffer,"%d",x);
        return (string)buffer;
    }
}mynumber;
class Operator{
    char op[8]="+-*/";
public:
    char get(int n){
        if(n==5) n--;
        int x=myrandom.random_number_in(0,n-1);
        return op[x];
    }
}myoperator;
class Solver{
    string result;
public:
    string solve(int n){
        if(n<1||n>5){
            result="error";
            return result;
        }
        myrandom.init();
        result=mynumber.get(n);
        for(int i=0;i<n;i++){
            result+=myoperator.get(n);
            result+=mynumber.get(n);
        }
        return result;
    }
}mysolver;
int main(){
    int n;
    while(cin>>n){
        cout<<mysolver.solve(n)<<endl;
    }
    return 0;
}

接下去将再该算法的基础上,进一步优化,添加功能点.具体做法将在小组讨论中确定.