//李妍 2015.3.12 //四则运算新 #include<iostream> #include<fstream> #include<iomanip> #include<cmath> #include<vector> #include<string> #include<stdio.h> #include<stdlib.h> #include<time.h> using namespace std; #define random() (rand()%1000) const int MAX=1000; /*输入模块*/ class Input { public: Input() { for( int i = 0;i < MAX;i++ ) Str_input[i] = '