Question

新手一枚.求教各位高手

Answer 1

记得老师上次随手演示的时候把
cerr << "Usage: " << progname << " -X" << endl;
cerr << " where X is one of the following options:" << endl;
cerr << " r generate problem by row" << endl;
cerr << " c generate problem by column" << endl;
cerr << " n generate problem by nonzero" << endl;
cerr << " Exiting..." << endl;
这一段删掉了的... 但是我删了之后会出现 error C2129: 静态函数“void usage(const char *)”已声明但未定义 。