pablic string float vale;rivate stringscorecsCore三9o千ehglog cmy hove是Aelse if score 8syy-have B巴】else if score =70千ehgy的ecelse if cscore 70了eylymy haveChinesemathEnglish网Chinee=飞ndbm、Bngeo时math Random

public string floatValue; private string score;

if (score >= 90) { Console.WriteLine("My grade is A"); } else if (score >= 80) { Console.WriteLine("My grade is B"); } else if (score >= 70) { Console.WriteLine("My grade is C"); } else if (score < 70) { Console.WriteLine("My grade is D"); }