使用命令行参数打开文件时出错

Question

I am supposed to open a file using command line arguments and retrieve the data from it. I've gone through the code plenty of times and my problem is in the very beginning of everything!

 ifstream infile;
 infile.open(argv[1]);
 if(!(infile.is_open()))
 {
   std::cout << "Error opening file";
   return 1;
 }

The prompt I'm using to run my program is:

 ./movie_stats < ./input/test1.in  ./my-output/test1.out

Answer 1

< pipes the content of ./input/test1.in to stdin

you want to call your application with the arguments like this:

 ./movie_stats ./input/test1.in  ./my-output/test1.out