class Demo10
{
public static void main(String[] args)
{
int math = 91;
if (math>90)
System.out.println("very good!");
int chinese =88;
if (chinese>90)
System.out.println("very good!");
else
{
System.out.println("继续努力！");
System.out.println("加油!");
}
int s = 98;
if (s>90 && s<=100)
System.out.println("A");
else if (s>80)
System.out.println("B");
else if (s>70)
System.out.println("C");
else if (s>60)
System.out.println("D");
else
System.out.println("E");
}
}

mark