Output grade level && determine the condition of the two-second equation root

1. Enter name, score, output level 80-100 excellent, 60-79 General, 0-59 continue efforts

  while(true) {Console.Write ("Name:");                Console.ReadLine (); Console.Write ("Score:"); ints =int.                Parse (Console.ReadLine ()); if(S >= the&& s <= -) {Console.WriteLine ("Excellent"); }                if(S < the&& s >= -) {Console.WriteLine ("General"); }                if(S < -&& s >=0) {Console.WriteLine ("keep trying ."); }            } 

2. Enter the three parameters of the one-dimensional two-time equation to determine whether the equation is real roots or not

 while(true) {Console.WriteLine ("Please enter three parameters for the two-second equation"); Console.Write ("the value of a is:"); DoubleA =Double.                Parse (Console.ReadLine ()); Console.Write ("The value of B is:"); Doubleb =Double.                Parse (Console.ReadLine ()); Console.Write ("the value of C is:"); Doublec =Double.                Parse (Console.ReadLine ()); Console.WriteLine ("confirm that the two-time equation of one dollar is"+ A +"*x^2+"+ B +"*x+"+ C +"=0"); DoubleD = b * B-4AC; if(A = =0) {Console.WriteLine ("This equation is not a unary two-time equation ."); }                Else if(D >0) {Console.WriteLine ("This equation is a two-dimensional equation and has two unequal real roots"); }                Else if(d = =0) {Console.WriteLine ("This equation is a unary two-time equation and has two equal real roots"); }                Else{Console.WriteLine ("This equation is a unary two-time equation, but no real roots .");            } console.readline (); }

Output grade level && determine the root of a two-time equation