COMMAND LINE ARGUMENTS
When a program is invoked, it may accept arguments from the command line such as the name of a data file to process.

In TurboC, the two functions ParamCount and ParamStr are used to retrieve these values.

ParamCount
This function returns the number of arguments of the command line which follow the name of the program. In this example below,

        test  file1.c  file2.pas

ParamStr
This function returns a string representing the value of the command-line parameter.

program commandline( output );

var arguments : integer;

begin
    if ParamCount = 0 then
    begin
         writeln( 'No parameters supplied' );
         halt(1)
    end
    else begin
         writeln('There are ', ParamCount, ' parameters' );
         for arguments := 1 to ParamCount do
             Writeln( 'Parameter ',arguments,' = ',ParamStr(arguments) );
    end
end.