java4android (練習使用if else結構)

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public class Text01{    public static void main(String args[]){        int score = -1;        if(score>85&&score<=100){            System.out.print("A");        }        else if(score>75&&score<=85){            System.out.print("B");        }        else if(score>60&&score<=75){            System.out.print("C");        }        else if(score<=60&&score>=0){            System.out.print("D");        }        else {            System.out.print("buzhengchang");        }            }}

2.列印出100-200之間所有的素數

 1 public class Text02{ 2     public static void main(String args[]){ 3         for(int i=100;i<=200;i++){ 4         boolean b = false; 5             for(int j=2;j<=i-1;j++){ 6                 int k =i%j; 7                 if(k==0){ 8                     b=true; 9                 }10             }11             if(!b){12                 System.out.print(i +"\n");13             }14         }15     }16 }