C++新手求助！！

/* * File: mian.cpp * -------------- */ #include <iostream> #include "genlib.h" #include "simpio.h" int main() { int total; total = GetInteger(); cout << "The total is " << total << "." << endl; return 0; } 

#ifndef GENLIB_H_ #define GENLIB_H_ /*  * File: genlib.h  * Version: 1.0CPP  * Last modified on Wed Sep 18 13:41:31 PDT 2002 by jzelenski  * ----------------------------------------------------------  * This header file is indicated to be included in  * all the programs written for CS106B/X and provides a few  * common definitions. Note this header has a "using namespace std"  * clause. If a file includes this header, it can then use  * features from the std namespace without qualifying by scope.  */ #include <string> using namespace std; /*  * Function: Error  * Usage: Error(msg)  * ------------------  * Error outputs an error string to the cerr stream and  * then throws a string exception corresponding to the error.  */ void Error(string str); // /* // * Function macro: main // * -------------------- // * The purpose of this macro definition is to rename the student // * main to Main in order to allow a custom main defined in our // * libraries to configure the application before passing control // * back to the student program. // */ // #ifdef __APPLE__ // #define main Main // #endif #endif /*GENLIB_H_*/ 

/*  * File: genlib.cpp  * Last modified September 2011 by Colin  * ----------------  * This file implements the genlib.h interface  * It is needed by programs using the Stanford CS106B libraries  * If the ErrorException is unhandled by student code, it will  * be caught by init.cpp code, which wraps around the student's  * main() function  */ #include "genlib.h" #include <cstdlib> #include <iostream> ErrorException::ErrorException(string m="unspecified custom error") : msg(m) { } ErrorException::~ErrorException() throw() {} const char* ErrorException::what() const throw() { return this->msg.c_str(); } void Error(string str) { ErrorException err(str); throw err; } 

#ifndef SIMPIO_H_ #define SIMPIO_H_ /*  * File: simpio.h  * Version: 1.0CPP  * Last modified on Wed Sep 18 13:34:29 PDT 2002 by jzelenski  * ----------------------------------------------------------  * This interface provides access to a simple package of  * functions that simplify the reading of console input.  */ #include "genlib.h" /*  * Function: GetInteger  * Usage: n = GetInteger();  * ------------------------  * GetInteger reads a line of text from standard input and scans  * it as an integer. The integer value is returned. If an  * integer cannot be scanned or if more characters follow the  * number, the user is given a chance to rety.  */ int GetInteger(); /*  * Function: GetLong  * Usage: n = GetLong();  * ---------------------  * GetLong reads a line of text from standard input and scans  * it into a long integer. The long is returned. If the   * number cannot be scanned or if extra characters follow it,  * the user is given a chance to retry.  */ long GetLong(); /*  * Function: GetReal  * Usage: x = GetReal();  * ---------------------  * GetReal reads a line of text from standard input and scans  * it as a double. If the number cannot be scanned or if extra  * characters follow after the number ends, the user is given  * a chance to reenter the value.  */ double GetReal(); /*  * Function: GetLine  * Usage: s = GetLine();  * ---------------------  * GetLine reads a line of text from standard input and returns  * the line as a string. The newline character that terminates  * the input is not stored as part of the string that is returned.  */ string GetLine(); #endif /*SIMPIO_H_*/ 

/* File : simpio.cpp  * Last modified September 2011 by Colin  *  * Based on the discussion in the CS106L Course Reader, chapter 3  * http://www.stanford.edu/class/cs106l/course_reader.html  */ #include <iostream> #include <sstream> #include "genlib.h" /*  * Function: GetLine  * Usage: s = GetLine();  */ string GetLine() { string result; getline(cin, result); if (cin.fail()) { result = ""; cin.clear(); } return result; } /*  * Function: GetInteger  * Usage: n = GetInteger();  */ int GetInteger() { while(true) { stringstream converter; converter << GetLine(); int result; if (converter >> result) { char remaining; if(converter >> remaining) cout << "Unexpected character: " << remaining << endl; else return result; } else cout << "Please enter an integer." << endl; } } /*  * Function: GetLong  * Usage: n = GetLong();  */ long GetLong() { while(true) { stringstream converter; converter << GetLine(); long result; if(converter >> result) { char remaining; if(converter >> remaining) cout << "Unexpected character: " << remaining << endl; else return result; } else cout << "Please enter an integer (long)." << endl; } } /*  * Function: GetReal  * Usage: x = GetReal();  */ double GetReal() { while(true) { stringstream converter; converter << GetLine(); double result; if (converter >> result) { char remaining; if (converter >> remaining) cout << "Unexpected character: " << remaining << endl; else return result; } else cout << "Please enter a floating-point number."; } }