我正在学习 c++，下面的示例显示“`Enter' undeclared (first use this function)”。我一直在这个网站上阅读一些问题，似乎它与不声明函数有关。但我无法让它工作。任何帮助将不胜感激。
//
// Program to convert temperature from Celsius degree
// units into Fahrenheit degree units:
// Fahrenheit = Celsius * (212 - 32)/100 + 32
//
#include <cstdio>
#include <cstdlib>
#include <iostream>
using namespace std;
int main(int nNumberofArgs, char* pszArgs[])
{
// enter the temperature in Celsius
int celsius;
cout << “Enter the temperature in Celsius:”;
cin >> celsius;
// calculate conversion factor for Celsius
// to Fahrenheit
int factor;
factor = 212 - 32;
// use conversion factor to convert Celsius
// into Fahrenheit values
int fahrenheit;
fahrenheit = factor * celsius/100 + 32;
// output the results (followed by a NewLine)
cout << “Fahrenheit value is:”;
cout << fahrenheit << endl;
// wait until user is ready before terminating program
// to allow the user to see the program results
system(“PAUSE”);
return 0;
}