Question

哪位高手来帮帮我，几个JAVA的小程序，帮我看看是哪里出错了，要详细的哦！！！

RT
1....
public class Experiment2_2
{public static void main(String args[ ])
{float f=3.14159;
double d=123456789.123456789;
double e=-1.23456789e4;
System.out.println("f="+f);
System.out.println("d="+d);
System.out.println("e="+e);
System.out.println("f="+(___)f);
System.out.println("d="+(___)d);
System.out.println("e="+(___)e);
System.out.println("f="+(___)f);
System.out.println("d="+(___)d);
System.out.println("e="+(___)e);
}
}

2.....
public class Experiment2_1
{public static void main(String args[ ])
{int i=1234;
long l=12345678901234;
float f=3.14159;
System.out.println("i="+i);
System.out.println("l="+l);
System.out.println("f="+f);
System.out.println("i="+(long)i);
System.out.println("l="+(int)l);
System.out.println("f="+(int)f);
}
}

3....
public class Experiment2_4
{public static void main(String args[ ])
{___________; //声明一个整型变量i，并赋值为33333.
System.out.println("i="+i); //直接输出整型数i
System.out.println("i="+__); //输出i为长整型
_____________________; //输出i为单精度型
_____________________; //输出i为双精度型
_____________________; //输出i为字符型

有高手的帮帮我，万分感谢啊

Answer 1

1
public class Experiment2_2 {
public static void main(String args[]) {
// float f = 3.14159;//error
float f = 3.14159F;//error
double d = 123456789.123456789;
double e = -1.23456789e4;
System.out.println("f=" + f);
System.out.println("d=" + d);
System.out.println("e=" + e);
// System.out.println("f=" + (___) f);
// System.out.println("d=" + (___) d);
// System.out.println("e=" + (___) e);
// System.out.println("f=" + (___) f);
// System.out.println("d=" + (___) d);
// System.out.println("e=" + (___) e);

System.out.println("f=" + f);
System.out.println("d=" + d);
System.out.println("e=" + e);
System.out.println("f=" + f);
System.out.println("d=" + d);
System.out.println("e=" + e);
}
}

2
public class Experiment2_1 {
public static void main(String args[]) {
int i = 1234;
// long l = 12345678901234;
// float f = 3.14159;
long l = 12345678901234L;
float f = 3.14159F;
System.out.println("i=" + i);
System.out.println("l=" + l);
System.out.println("f=" + f);
System.out.println("i=" + (long) i);
System.out.println("l=" + (int) l);
System.out.println("f=" + (int) f);
}
}

3
public class Experiment2_4{
public static void main(String[] args) {
int i = 33333;//声明一个整型变量i，并赋值为33333.
System.out.println("i = " + i);//直接输出整型数i
System.out.println("i = " + (long)i); //输出i为长整型
System.out.println("i = " + (float)i);//输出i为单精度型
System.out.println("i = " + (double)i); //输出i为双精度型
System.out.println("i = " + (char)i);//输出i为字符型
}
}

Answer 2

1、float f=3.14159;要写成float f=3.14159f;
double e=-1.23456789e4; 数值中的e怎么会出现这种呢？ 去掉 不要写字母这些在里面
2、 float f=3.14159;要写成float f=3.14159f;
long l=12345678901234;要写成 long l=12345678901234l;
3、填空依次是：int i = 33333；
(long)i;
System.out.println("i为单精度"+（float）i)；
System.out.println("i为双精度"+（double）i)；
System.out.println("i为字符型"+(i+""))；
或者 System.out.println("i为字符型"+Integer.toString(i))；

Answer 3

float f=3.14159f
3
public class Experiment2_4{
public static void main(String[] args) {
int i = 33333;//声明一个整型变量i，并赋值为33333.
System.out.println("i = " + i);//直接输出整型数i
System.out.println("i = " + (long)i); //输出i为长整型
System.out.println("i = " + (float)i);//输出i为单精度型
System.out.println("i = " + (double)i); //输出i为双精度型
System.out.println("i = " + (char)i);//输出i为字符型
}
}

Answer 4

你定义变量的时候出错啦 float f=3.14159f;记得加f long l=12345678901234l;记得加l ,所有的都改

Answer 5

float f=3.14159f;
1,2都是这个问题