D.ershane Solutions Ddili.org

Program Environment

  1. import std.stdio;
    import std.conv;
    
    int main(string[] args) {
        if (args.length != 4) {
            stderr.writeln(
                "ERROR! Usage: \n    ", args[0],
                " a_number operator another_number");
            return 1;
        }
    
        immutable first = to!double(args[1]);
        string op = args[2];
        immutable second = to!double(args[3]);
    
        switch (op) {
    
        case "+":
            writeln(first + second);
            break;
    
        case "-":
            writeln(first - second);
            break;
    
        case "x":
            writeln(first * second);
            break;
    
        case "/":
            writeln(first / second);
            break;
    
        default:
            throw new Exception("Invalid operator: " ~ op);
        }
    
        return 0;
    }
    
  2. import std.stdio;
    import std.process;
    
    void main() {
        write("Please enter the command line to execute: ");
        string commandLine = readln();
    
        writeln("The output: ", executeShell(commandLine));
    }