我正在为一个班级做 C++ 评估，十年来我没有使用过 C++，所以这可能是我想念的简单的东西；但是，我似乎无法弄清楚。
我有一个用不产生输出的函数定义的类；看起来它甚至没有运行，我不知道为什么。有人可以向我指出我的问题吗？
问题： cout来自getwords类的函数readwords不显示任何结果。
这是我的课：
class readwords {
private:
char c;
//string aword;
public:
void getwords(std::istream& file) {
cout << "I got here" << std::flush;
/*while(file.good()) {
cout << "I got here\n";
c = file.get();
if(isspace(c)) cout << "\n"; //continue;
if(isalnum(c)) {
cout << c; //aword.insert(aword.end(),c);
}
}
*/
}
};
这是从我的主要调用：
#include <fstream>
#include <stdlib.h>
#include "lab1.h"
using namespace std;
readwords wordsinfile;
words wordslist;
int main ( int argc, char *argv[] )
{
if ( argc != 2 ) {
// Looks like we have no arguments and need do something about it
// Lets tell the user
cout << "Usage: " << argv[0] <<" <filename>\n";
} else {
// Yeah we have arguements so lets make sure the file exists and it is readable
ifstream ourfile(argv[1]);
if (!ourfile.is_open()) {
// Then we have a problem opening the file
// Lets tell the user and exit
cout << "Error: " << argv[0] << " could not open the file. Exiting\n";
exit (1);
}
// Do we have a ASCII file?
if (isasciifile(ourfile)) {
cout << "Error: " << argv[0] << " only can handle ASCII or non empty files. Exiting\n";
exit(1);
}
// Let ensure we are at the start of the file
ourfile.seekg (0, ios::beg);
// Now lets close it up
ourfile.close();
}
// Ok looks like we have past our tests
// Time to go to work on the file
ifstream ourfile2(argv[1]);
wordsinfile.getwords(ourfile2);
}
感谢您提供任何帮助。