作业一 例3.1-3.

例3.1

class DataDemo01{
public static void main(String[] args){
int num=9999999999999999999999999;
}
}

例3.2

class DataDemo02{
public static void main(String[] args){
int max=2147483647;
System.out.println("整型的最大值:"+max);
System.out.println("整型最大值+1:"+(max+1));
System.out.println("整型最大值+2:"+(max+2));
}
}

例3.3

class DataDemo03{
public static void main(String[] args){
int max=2147483647;
System.out.println("整型的最大值:"+max);
System.out.println("整型最大值+1:"+(max+1));
System.out.println("整型最大值+2:"+(max+2L));
System.out.println("整型最大值+2:"+((long)max+2));

}
}

例3.4

class DataDemo04{
public static void main(String[] args){
char ch1=‘a‘;
char ch2=97;
System.out.println("ch1="+ch1);
System.out.println("ch2="+ch2);

}
}

例3.5

class DataDemo05{
public static void main(String[] args){
char ch1=‘\"‘;
char ch2=‘\\‘;
System.out.println("ch1="+ch1);
System.out.println("ch2="+ch2);
System.out.println("\"Hello World\"");

}
}

例3.6

class DataDemo06{
public static void main(String[] args){
float num=3.0f;
System.out.println("两个小数相乘:"+num*num);

}
}

例3.7

class DataDemo07{
public static void main(String[] args){
boolean flag=true;
System.out.println("flag="+flag);

}
}