c# - Adjusting the console apliacation (trycatch and while loop) -

so in code i'm trying make if user inputs value out of range display message:

enter valid input (between 1 , 2^53)

what doing @ moment when input letter message appears, when input number lower 0, resets loop , continues if nothing happened.

//variables double length, width, totalarea, totallength; const double feet = 3.75;  //questions console.title = "double glazing window calculator"; console.writeline("double glazing calculator\n"); bool inputfalse = false;  {    try    {             {           console.write("enter height of of window in meteres ");                      length = double.parse(console.readline());           console.write("enter width of of window in meteres ");           width = double.parse(console.readline());          } while (length < 1 || width < 1);        //maths       totalarea = length * width * 2;       totallength = (length * 2 + width * 2) * feet;       console.writeline("the total area of glass required in m^2 (to 2 decinmal places) {0} ", totalarea.tostring("0.##"));        console.writeline("the total length of wood required in feet (to 2 decimal places) {0}", totallength.tostring("0.##"));                 }    catch    {       inputfalse = (true);       console.writeline("enter valid input (between 1 , 2^53)");    } } while (true); 

instead of catching exception double.parse better use double.tryparse. , since want values @ least 1 can use fact double.tryparse set out parameters 0 when parsing fails.

double length = 0, width = 0; const double feet = 3.75;  //questions console.title = "double glazing window calculator"; console.writeline("double glazing calculator\n");  while (true) {     console.write("enter height of of window in meteres ");     double.tryparse(console.readline(), out length);     console.write("enter width of of window in meteres ");     double.tryparse(console.readline(), out width);      if (length < 1 || width < 1)     {         console.writeline("enter valid input (between 1 , 2^53)");     }     else     {         break;     } }  //maths var totalarea = length * width * 2; var totallength = (length * 2 + width * 2) * feet; console.writeline("the total area of glass required in m^2 (to 2 decinmal places) {0} ", totalarea.tostring("0.##"));  console.writeline("the total length of wood required in feet (to 2 decimal places) {0}", totallength.tostring("0.##")); 

you split 2 while loops doesn't let them enter width until enter valid length first.