==================카운트 만들기
1. while 구문으로 만들은것
class FlowEx19
{
public static void main(String[] args)
{
int i = 10;
while(i >= 0){
System.out.println(i);
for (int j =0; j <1000000000 ;j++ ) {
;
}
i--;
}
System.out.println("완료");
}
} |
2. for문으로 만들기
class Cho {
public static void main(String[] args) {
for (int i = 10 ; i >=0 ; i-- ) {
System.out.println(i);
for (int j = 0; j < 1000000000 ; j++ ) {
;
}
}
}
} |
======================로또 for문으로 출력해보기
문장1
class For {
public static void main(String[] args) {
int temp = 0;
int a[] = new int[45];
int k = 0;
for (int i = 0; i < 45 ; i++ ) {
a[i] = i + 1;
}
for (int y = 0; y < 100 ; y++ ) {
k = (int)(Math.random()*45);
temp = a[0];
a[0] = a[k];
a[k] = temp;
}
for (int i =0; i <= 6 ; i++ ){
System.out.print(a[i]+" ");
}
}
} |
문장2
class Tee {
public static void main(String[] args) {
int a = 0;
for (int i = 0; i < 6 ; i++){
a = (int)(Math.random()*45)+1;
System.out.print(a + "\t" );
}
}
} |
================시작과 끝 시간 currentTimeMillis 이용하여출력하여라
class Tee {
public static void main(String[] args) {
long cc = System.currentTimeMillis();
int a = 0;
for (int i = 0; i < 6 ; i++){
a = (int)(Math.random()*45)+1;
System.out.print(a + "\t" );
}
long ccq = System.currentTimeMillis();
System.out.println("시작" + cc);
System.out.println("끝" + ccq);
System.out.println("걸린시간" + " " +(ccq - cc));
}
} |
===========if 문성적표만들기
class If {
public static void main(String [] args){
int a = 100;
String b ="";
if (a >= 100){
b = "A";
if (a >= 95){
b += "+";
}
} else {
b ="B";
}
System.out.println(b);
}
} |