Homework "input/output"

1. Build a program that reads a sequence of numbers, separated by a combination of blanks (' '), tabs ('\t'), and newline characters ('\n'), from the standard input and prints these numbers together with their sines and cosines (in a table form) to the standard output. Something like

   char[] delimiters = {' ','\t','\n'};
   var options = StringSplitOptions.RemoveEmptyEntries;
   for( string line = ReadLine(); line != null; line = ReadLine() ){
   	var words = line.Split(delimiters,options);
   	foreach(var word in words){
   		double x = double.Parse(word);
   		WriteLine($"{x} {Sin(x)} {Cos(x)}");
                   }
           }
   

   The program can be run as

   echo 1 2 3 4 5 | mono stdin.exe > out.txt
   

   or

   echo 1 2 3 4 5 > input.txt
   mono stdin.exe < input.txt > out.txt
   

   or

   echo 1 2 3 4 5 > input.txt
   cat input.txt | mono stdin.exe > out.txt
   

2. Build a program that reads a set of numbers from the command-line and prints these numbers together with their sines and cosines (in a table form) to the standard output. Something like

   public static void Main(string[] args){
   foreach(var arg in args){
   	double x = double.Parse(arg);
   	WriteLine($"{x} {Sin(x)} {Cos(x)}");
   	}
   }
   

   The program can be run as

   mono cmdline.exe 1 2 3 4 5 > out.txt
   

   or

   echo 1 2 3 4 5 > inputfile
   mono cmdline.exe $(cat inputfile) > out.txt
   

3. Build a program that reads a set of numbers (separated by newlines) from "inputfile" and writes them together with their sines and cosines (in a table form) to "outputfile". The program must read the names of the "inputfile" and "outputfile" from the command-line. Something like

   mono fileio.exe -input:input.txt -output:out.txt
   

   public static int Main(string[] args){
           string infile=null,outfile=null;
           foreach(var arg in args){
                   var words=arg.Split(':');
                   if(words[0]=="-input")infile=words[1];
                   else if(words[0]=="-output")outfile=words[1];
                   else { Error.WriteLine("wrong argument"); return 1; }
                   }
           var instream =new System.IO.StreamReader(infile);
           var outstream=new System.IO.StreamWriter(outfile);
           for(string line=instream.ReadLine();line!=null;line=instream.ReadLine()){
                   double x=double.Parse(line);
                   outstream.WriteLine($"{x} {Sin(x)} {Cos(x)}");
           }
           instream.Close();
           outstream.Close();
   	return 0;
   }