ex0226a
class ex0226a{
public static void main(String[] args)
{
String fName="John", lName="Chen";
int weight=56; // weight: Kg
int height=175; // height: cm
int age=20;
boolean gender=true;
// 1cm = 0.0328 英呎
// 1kg = 2.21 磅
System.out.println(" Name: "+fName+" "+ lName);
System.out.println(" Gender: "+gen(gender));
System.out.println(" weight: "+wei(weight)+" 磅 ");
System.out.println(" height: "+hei(height)+" 英呎 ");
}
public static String gen(boolean gen)
{
if(gen=true) return "Man";
else return "Female";
}
public static Double wei(int wei)
{
return wei*2.21;
}
public static Double hei(int hei)
{
return hei*0.0328;
}
}
ex0305a
import java.io.*;
class ex0305a{
public static void main(String[] args) throws IOException{
//
// input a string & transfer into a integer
//
System.out.print(" Input a number :");
BufferedReader br =new
BufferedReader(new InputStreamReader(System.in));
String str=br.readLine();
int fee=Integer.parseInt(str);
//
System.out.println(" NT1000 :" +fee/1000 );
fee%=1000;
System.out.println(" NT500 :" + fee/500);
fee%=500;
System.out.println(" NT100 :" + fee/100);
fee%=100;
System.out.println(" NT50 :" + fee/50);
fee%=50;
System.out.println(" NT10 :" + fee/10);
fee%=10;
System.out.println(" NT5 :" + fee/5);
fee%=5;
System.out.println(" NT1 :" + fee/1);
}
}
ex0312a
class ex0312a{
public static void main(String[] args){
int data[]={81,95,66,80,77,51,69,33,-1,46,90,87,93,72,63,55,-1,65,66,71,50,88,47,49,83,61};
//
// Statistic A, B, C, D, Fail & absent students number
//
// Accumulate total score and total number (except absent students)
//
int na=0,nb=0,nc=0,nd=0,fn=0,an=0,sum=0;
for(int i:data){
if(i>=0){
sum+=i;
if(i>=90) na++;
else if(i>=80) nb++;
else if(i>=70) nc++;
else if(i>=60) nd++;
else fn++;
}
else
an++;
}
System.out.println(" Number of A :"+na);
System.out.println(" Number of B :"+nb);
System.out.println(" Number of C :"+nc);
System.out.println(" Number of D :"+nd);
System.out.println(" Fail Number :"+fn);
System.out.println(" Absent Number :"+ an);
System.out.println(" *** Average :"+avg(sum,data.length-an));
}
//
// sum: total score (except absent students)
//
// num: total number (except absent students)
//
public static double avg(int sum, int num){
double tmp;
int tmp1;
tmp=(double)sum/num;
tmp1=(int)(tmp*10);
return tmp1/10.0;
}
}
ex0319b
class ex0319b{
public static void main(String[] args)
{
int[][] matA={{1,2,3},{4,5,6},{7,8,9}};
int[][] matB={{1,7,6,4,3},{2,1,5,7,9},{4,3,5,1,7}};
int[][] matC=new int[3][5];
// Declate and allocate two dimension int array ==> matC
int sum=0;
mtrPtr(matA);
System.out.println("=====================================");
mtrPtr(matB);
for(int i=0;i<matC.length;i++){
for(int j=0;j<matC[i].length;j++){
sum=0;
for(int k=0;k<matC.length;k++)
sum=sum+matA[i][k]*matB[k][j];
matC[i][j]=sum;
}
}
System.out.println("=====================================");
mtrPtr(matC);
}
public static void mtrPtr(int[][] mat){
for(int i=0;i<mat.length;i++){
for(int j=0;j<mat[i].length;j++)
System.out.print(" "+mat[i][j]+"\t");
System.out.println();
}
}
}
ex0326b
class student{
String name;
int age;
boolean gender;
student(){};
void setName(String nn){
name=nn;
}
String getName(){
return name;
}
void setAge(int nn){
age=nn;
}
int getAge(){
return age;
}
void setGender(boolean nn){
gender=nn;
}
boolean getGender(){
return gender;
}
}
class ex0326b{
public static void main(String[] args)
{
student std01=new student();
std01.setName("Mary Chen");
std01.setAge(20);
std01.setGender(true);
System.out.println(" Std name: "+std01.getName());
System.out.println(" Std age: "+std01.getAge());
System.out.println(" Std gender: "+std01.getGender());
}
}
ex0326d
class score{
int[] data;
int base=60;
score(int[] dd){ data=dd;}
int getHigh(){
int high=0;
for(int i:data) if(i>high) high=i;
return high;
}
int passNo(){
int count=0;
for(int i:data) if(i>=base) count++;
return count;
}
float getAvg(){
float sum=0f;
for(int i:data) sum+=i;
return sum/(float) data.length;
}
}
class ex0326d{
public static void main(String[] args)
{
int[] dataA={99,88,77,66,55,44,92,56};
int[] dataB={63,57,89,73,61,72,78,47,76,85,63,90,51,68,39};
int[] dataC={79,78,47,96,85,54,80,66,73,52,84,73,97,60,55,70,65};
score itmA=new score(dataA);
score itmB=new score(dataB);
score itmC=new score(dataC);
System.out.println(" Highest score of itmA: "+itmA.getHigh());
System.out.println(" Pass No of itmA: "+itmA.passNo());
System.out.println(" Average of itmA: "+itmA.getAvg());
System.out.println(" Highest score of itmB: "+itmB.getHigh());
System.out.println(" Pass No of itmB: "+itmB.passNo());
System.out.println(" Average of itmB: "+itmB.getAvg());
System.out.println(" Highest score of itmC: "+itmC.getHigh());
System.out.println(" Pass No of itmC: "+itmC.passNo());
System.out.println(" Average of itmC: "+itmC.getAvg());
System.out.println(" *Highest score of all: "+getMax(itmA.getHigh(),itmB.getHigh(),itmC.getHigh()));
System.out.println(" *Pass No of all: "+(itmA.passNo()+itmB.passNo()+itmC.passNo()));
System.out.println(" *Average of all: "+(itmA.getAvg()+itmB.getAvg()+itmC.getAvg())/3);
}
public static int getMax(int a, int b, int c){
if(a > b)
if( a > c) return a;
else return c;
else
if(b > c) return b;
else return c;
}
}
ex0326x
class ex0326x{
public static void main(String[] args)
{
int[][] fee={{45,40,50,30,45},{100,95,80,90,110},
{90,85,120,110,150}};
int[] sumDay=new int[5];
int[] sumBld=new int[3];
int sum=0;
for(int i=0;i<3;i++){
sum=0;
for(int j=0;j<5;j++){
sum=sum+fee[i][j];
}
sumBld[i]=sum;
}
for(int j=0;j<5;j++){
sum=0;
for(int i=0;i<3;i++){
sum=sum+fee[i][j];
}
sumDay[j]=sum;
}
mtrPtr(fee);
System.out.println(" Total fee of Breakfast, Lunch and dinner: "+
sumBld[0]+" "+sumBld[1]+" "+sumBld[2]);
System.out.print(" Total fee of each day: ");
for(int df: sumDay) System.out.print(" "+df);
System.out.println();
}
public static void mtrPtr(int[][] mat){
for(int i=0;i<mat.length;i++){
for(int j=0;j<mat[0].length;j++)
System.out.print(" "+mat[i][j]+"\t");
System.out.println();
}
}
}
ex0409b
class point{
int x, y;
point(){
x=0;
y=0;
}
point(int x, int y){
this.x=x;
this.y=y;
}
double distance(){ // Distance from point to origin
return (int) (Math.sqrt(x*x+y*y)*100)/100.0;
}
int location(){
if(x==0 && y==0) return 0; // on origin
if(x>0 && y>0) return 1; // on 1st quadrant
if(x<0 && y>0) return 2; // on 2nd quadrant
if(x<0 && y<0) return 3; // on 3rd quadrant
if(x>0 && y<0) return 4; // on 4thquadrant
if(y==0) return 5; // on X axle
return 6; // on Y axle
}
int disX(){ // Distance from point to X axle
return Math.abs(y);
}
int disY(){ // Distance from point to Y axle
return Math.abs(x);
}
}
class ex0409b{
public static void main(String[] args)
{
// create 3 points object;
// point1 ==> (0, 0), point2 ==> (4, 7), point3 ==> (-5 ,3)
point p1 = new point();
point p2 = new point(4,7);
point p3 = new point(-5,3);
System.out.println(" Location of point1: "+p1.location());
System.out.println(" Location of ponit2: "+p2.location() );
System.out.println(" Location of point3: "+p3.location() );
System.out.println(" Distance of point1: "+p1.distance() );
System.out.println(" Distance of point2: "+p2.distance() );
System.out.println(" Distance of point3: "+p3.distance() );
System.out.println(" Distance point2 to X : "+p2.disX() );
System.out.println(" Distance point2 to Y : "+p2.disY() );
System.out.println(" Distance point3 to X : "+p3.disX() );
System.out.println(" Distance point3 to Y : "+p3.disY() );
}
}
test1
class test1{
public static void main(String[] args)
{
int aa=-1,bb,cc,dd;
bb=aa>>1;
cc=aa>>>1;
dd=aa<<1;
System.out.println(" aa >> 1 "+ bb);
System.out.println(" aa >>> 1 "+ cc);
System.out.println(" aa << 1 "+ dd);
}
}
