main()函数的参数是OS在运行程序时, 先从main()函数开始,

这时它会向main()函数传递一些值, 这是作为main()的"形参"会接受到了一些数据,

这些数据会会是写什么呢?

是不是不同的程序, 接受到的值不一样呢?

int main(int argc, char *argv[])

{

if(argc < 4)

{

cerr << "usage: " << argv[0] << " datafile datatype minsup [output]" << endl;

cerr << "datatype = 1 for Quest datagenerator binary" << endl;

cerr << "datatype = 2 for Quest datagenerator ascii" << endl;

cerr << "datatype = 3 for flat, i.e. all items per transaction on a single line" << endl;

cerr << "datatype = 4 for ascii version of Quest datagenerator binary" << endl;

}

else

{

FPgrowth *fpgrowth = new FPgrowth();

fpgrowth -> setData (argv[1],atoi(argv[2]));

fpgrowth -> setMinsup (atoi(argv[3]));

if(argc==5)

fpgrowth->setOutput(argv[4]);

clock_t start = clock();

int added = fpgrowth->mine();

cout << added << "\t[" << (clock()-start)/double(CLOCKS_PER_SEC) << "s]" << endl;

if(argc==5)

cout << "Frequent sets written to " << argv[4] << endl;

delete fpgrowth;

}

return 0;

}

这是一个面向对象的main()函数, 里面的函数我已经看懂了.

但是不知道到底main()函数的形参得到了什么值?????

请赐教