(ch3) - Loops, random numbers
while while (Boolean)
{
statement_1
statement_2
statement_last
}
Scanner keyboard = new Scanner(System.in);
System.out.println("put all your score and end with negative num");
double next, sum = 0;
int count = 0;
next = keyboard.nextDouble();
while (next >= 0)
{
sum += next;
count ++;
next = keyboard.nextDouble();
}
if (count == 0)
System.out.println("no scoresm entered");
else{
double average = sum/count;
System.out.println("average is " + average);
}
do while syntax do {
statement1
statement2
statement last
} while (boolean);
int countDown;
System.out.println("First do while loop");
countDown = 3;
do {
System.out.println("Hello World");
countDown -- ;
} while (countDown > 0);
System.out.println("second do while loop");
countDown = 0;
do{
System.out.println("Hello World");
countDown -- ;
} while (countDown > 0); //while문과 다르게 처음 한번은 무조건 실행
//First do while loop
Hello World
Hello World
Hello World
second do while loop
Hello World
for statement for ( initialization; Boolean; update)
Body
for ( int number = 100; number >= 0; number --)
System.out.println(number + "bottles of beer ");]
// 100 bottles
99 bottles
...
0 bottles
Nested Loops int rowNum, columnNum;
for (rowNum = 1; rowNum <= 3; rowNum++) {
for (columnNum = 1; columnNum <= 3; columnNum++) {
System.out.print(" row " + rowNum + " column " + columnNum);
}
System.out.println();
}
//row 1 column 1 row 1 column 2 row 1 column 3
row 2 column 1 row 2 column 2 row 2 column 3
row 3 column 1 row 3 column 2 row 3 column 3
break
for (int i = 1; i <= 5; i++) {
for (int j = 1; j <= 5; j++) {
if (i == 3 && j == 3)
break;
System.out.print("(" + i + "," + j + ")");
}
System.out.println();
}
//
(1,1)(1,2)(1,3)(1,4)(1,5)
(2,1)(2,2)(2,3)(2,4)(2,5)
(3,1)(3,2)
(4,1)(4,2)(4,3)(4,4)(4,5)
(5,1)(5,2)(5,3)(5,4)(5,5)
//제일 큰 loop에서 나오는게 아니라 가장 가까운 loop에서 빠져나옴
continue
for (int i = 1; i <= 10; i++) {
if (i > 4 && i < 9) {
continue;
}
System.out.println(i);
}
//1
2
3
4
9
10
exit
プログラムを直接終了
まちがった面会System.exit(0 ); // int
03-5 Random Numbers
擬似乱数:真のランダムではありませんbya seed value
same seed -> same sequence of random numbersimport java.util.Random;
Random randomGenerator = new Random();
int r = randomGenerator.nextInt();
r = randomGenerator.nextInt(n); // 0,1,2,...,n-1
r = randomGenerator.nextInt(3) + 4; // 0+4, 1+4, 2+4
double rd = randomGenerator.nextDouble(); // 0.0 <= r < 1.0
mathはimportを持たない
System.out.println(Math.random()); // [0.0 , 1.0)
for (int i = 0; i < 10; i++) {
System.out.println((int)(Math.random()*6)+1); // int, [1, 6]
}
Reference
この問題について((ch3) - Loops, random numbers), 我々は、より多くの情報をここで見つけました
https://velog.io/@yungommi/Java5-Loops
テキストは自由に共有またはコピーできます。ただし、このドキュメントのURLは参考URLとして残しておいてください。
Collection and Share based on the CC Protocol
while (Boolean)
{
statement_1
statement_2
statement_last
}
Scanner keyboard = new Scanner(System.in);
System.out.println("put all your score and end with negative num");
double next, sum = 0;
int count = 0;
next = keyboard.nextDouble();
while (next >= 0)
{
sum += next;
count ++;
next = keyboard.nextDouble();
}
if (count == 0)
System.out.println("no scoresm entered");
else{
double average = sum/count;
System.out.println("average is " + average);
}
do {
statement1
statement2
statement last
} while (boolean);
int countDown;
System.out.println("First do while loop");
countDown = 3;
do {
System.out.println("Hello World");
countDown -- ;
} while (countDown > 0);
System.out.println("second do while loop");
countDown = 0;
do{
System.out.println("Hello World");
countDown -- ;
} while (countDown > 0); //while문과 다르게 처음 한번은 무조건 실행
//First do while loop
Hello World
Hello World
Hello World
second do while loop
Hello World
for statement for ( initialization; Boolean; update)
Body
for ( int number = 100; number >= 0; number --)
System.out.println(number + "bottles of beer ");]
// 100 bottles
99 bottles
...
0 bottles
Nested Loops int rowNum, columnNum;
for (rowNum = 1; rowNum <= 3; rowNum++) {
for (columnNum = 1; columnNum <= 3; columnNum++) {
System.out.print(" row " + rowNum + " column " + columnNum);
}
System.out.println();
}
//row 1 column 1 row 1 column 2 row 1 column 3
row 2 column 1 row 2 column 2 row 2 column 3
row 3 column 1 row 3 column 2 row 3 column 3
break
for (int i = 1; i <= 5; i++) {
for (int j = 1; j <= 5; j++) {
if (i == 3 && j == 3)
break;
System.out.print("(" + i + "," + j + ")");
}
System.out.println();
}
//
(1,1)(1,2)(1,3)(1,4)(1,5)
(2,1)(2,2)(2,3)(2,4)(2,5)
(3,1)(3,2)
(4,1)(4,2)(4,3)(4,4)(4,5)
(5,1)(5,2)(5,3)(5,4)(5,5)
//제일 큰 loop에서 나오는게 아니라 가장 가까운 loop에서 빠져나옴
continue
for (int i = 1; i <= 10; i++) {
if (i > 4 && i < 9) {
continue;
}
System.out.println(i);
}
//1
2
3
4
9
10
exit
プログラムを直接終了
まちがった面会System.exit(0 ); // int
03-5 Random Numbers
擬似乱数:真のランダムではありませんbya seed value
same seed -> same sequence of random numbersimport java.util.Random;
Random randomGenerator = new Random();
int r = randomGenerator.nextInt();
r = randomGenerator.nextInt(n); // 0,1,2,...,n-1
r = randomGenerator.nextInt(3) + 4; // 0+4, 1+4, 2+4
double rd = randomGenerator.nextDouble(); // 0.0 <= r < 1.0
mathはimportを持たない
System.out.println(Math.random()); // [0.0 , 1.0)
for (int i = 0; i < 10; i++) {
System.out.println((int)(Math.random()*6)+1); // int, [1, 6]
}
Reference
この問題について((ch3) - Loops, random numbers), 我々は、より多くの情報をここで見つけました
https://velog.io/@yungommi/Java5-Loops
テキストは自由に共有またはコピーできます。ただし、このドキュメントのURLは参考URLとして残しておいてください。
Collection and Share based on the CC Protocol
for ( initialization; Boolean; update)
Body
for ( int number = 100; number >= 0; number --)
System.out.println(number + "bottles of beer ");]
// 100 bottles
99 bottles
...
0 bottles
int rowNum, columnNum;
for (rowNum = 1; rowNum <= 3; rowNum++) {
for (columnNum = 1; columnNum <= 3; columnNum++) {
System.out.print(" row " + rowNum + " column " + columnNum);
}
System.out.println();
}
//row 1 column 1 row 1 column 2 row 1 column 3
row 2 column 1 row 2 column 2 row 2 column 3
row 3 column 1 row 3 column 2 row 3 column 3
break
for (int i = 1; i <= 5; i++) {
for (int j = 1; j <= 5; j++) {
if (i == 3 && j == 3)
break;
System.out.print("(" + i + "," + j + ")");
}
System.out.println();
}
//
(1,1)(1,2)(1,3)(1,4)(1,5)
(2,1)(2,2)(2,3)(2,4)(2,5)
(3,1)(3,2)
(4,1)(4,2)(4,3)(4,4)(4,5)
(5,1)(5,2)(5,3)(5,4)(5,5)
//제일 큰 loop에서 나오는게 아니라 가장 가까운 loop에서 빠져나옴
continue
for (int i = 1; i <= 10; i++) {
if (i > 4 && i < 9) {
continue;
}
System.out.println(i);
}
//1
2
3
4
9
10
exit
プログラムを直接終了
まちがった面会System.exit(0 ); // int
03-5 Random Numbers
擬似乱数:真のランダムではありませんbya seed value
same seed -> same sequence of random numbersimport java.util.Random;
Random randomGenerator = new Random();
int r = randomGenerator.nextInt();
r = randomGenerator.nextInt(n); // 0,1,2,...,n-1
r = randomGenerator.nextInt(3) + 4; // 0+4, 1+4, 2+4
double rd = randomGenerator.nextDouble(); // 0.0 <= r < 1.0
mathはimportを持たない
System.out.println(Math.random()); // [0.0 , 1.0)
for (int i = 0; i < 10; i++) {
System.out.println((int)(Math.random()*6)+1); // int, [1, 6]
}
Reference
この問題について((ch3) - Loops, random numbers), 我々は、より多くの情報をここで見つけました
https://velog.io/@yungommi/Java5-Loops
テキストは自由に共有またはコピーできます。ただし、このドキュメントのURLは参考URLとして残しておいてください。
Collection and Share based on the CC Protocol
for (int i = 1; i <= 5; i++) {
for (int j = 1; j <= 5; j++) {
if (i == 3 && j == 3)
break;
System.out.print("(" + i + "," + j + ")");
}
System.out.println();
}
//
(1,1)(1,2)(1,3)(1,4)(1,5)
(2,1)(2,2)(2,3)(2,4)(2,5)
(3,1)(3,2)
(4,1)(4,2)(4,3)(4,4)(4,5)
(5,1)(5,2)(5,3)(5,4)(5,5)
//제일 큰 loop에서 나오는게 아니라 가장 가까운 loop에서 빠져나옴
for (int i = 1; i <= 10; i++) {
if (i > 4 && i < 9) {
continue;
}
System.out.println(i);
}
//1
2
3
4
9
10
exit
プログラムを直接終了
まちがった面会System.exit(0 ); // int
03-5 Random Numbers
擬似乱数:真のランダムではありませんbya seed value
same seed -> same sequence of random numbersimport java.util.Random;
Random randomGenerator = new Random();
int r = randomGenerator.nextInt();
r = randomGenerator.nextInt(n); // 0,1,2,...,n-1
r = randomGenerator.nextInt(3) + 4; // 0+4, 1+4, 2+4
double rd = randomGenerator.nextDouble(); // 0.0 <= r < 1.0
mathはimportを持たない
System.out.println(Math.random()); // [0.0 , 1.0)
for (int i = 0; i < 10; i++) {
System.out.println((int)(Math.random()*6)+1); // int, [1, 6]
}
Reference
この問題について((ch3) - Loops, random numbers), 我々は、より多くの情報をここで見つけました
https://velog.io/@yungommi/Java5-Loops
テキストは自由に共有またはコピーできます。ただし、このドキュメントのURLは参考URLとして残しておいてください。
Collection and Share based on the CC Protocol
System.exit(0 ); // int
擬似乱数:真のランダムではありませんbya seed value
same seed -> same sequence of random numbers
import java.util.Random;
Random randomGenerator = new Random();
int r = randomGenerator.nextInt();
r = randomGenerator.nextInt(n); // 0,1,2,...,n-1
r = randomGenerator.nextInt(3) + 4; // 0+4, 1+4, 2+4
double rd = randomGenerator.nextDouble(); // 0.0 <= r < 1.0
mathはimportを持たないSystem.out.println(Math.random()); // [0.0 , 1.0)
for (int i = 0; i < 10; i++) {
System.out.println((int)(Math.random()*6)+1); // int, [1, 6]
}
Reference
この問題について((ch3) - Loops, random numbers), 我々は、より多くの情報をここで見つけました https://velog.io/@yungommi/Java5-Loopsテキストは自由に共有またはコピーできます。ただし、このドキュメントのURLは参考URLとして残しておいてください。
Collection and Share based on the CC Protocol