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GeezerVison is showing github.com — ThinkJavaCode/ch07/Tables.java at master · lummypix/ThinkJavaCode

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/**
* Generating tables; encapsulation and generalization.
*/
public class Tables {
public static void example() {
int i = 1;
while (i < 10) {
double x = i;
System.out.println(x + " " + Math.log(x));
i = i + 1;
}
}
public static void example2() {
int i = 1;
while (i < 10) {
double x = i;
System.out.println(x + " " + Math.log(x) / Math.log(2));
i = i + 1;
}
}
public static void example3() {
final double LOG2 = Math.log(2);
int i = 1;
while (i < 100) {
double x = i;
System.out.println(x + " " + Math.log(x) / LOG2);
i = i * 2;
}
}
public static void example4() {
int i = 1;
while (i <= 6) {
System.out.printf("%4d", 2 * i);
i = i + 1;
}
System.out.println();
}
public static void printRow() {
int i = 1;
while (i <= 6) {
System.out.printf("%4d", 2 * i);
i = i + 1;
}
System.out.println();
}
public static void printRow2(int n) {
int i = 1;
while (i <= 6) {
System.out.printf("%4d", n * i);
i = i + 1;
}
System.out.println();
}
public static void example5() {
int i = 1;
while (i <= 6) {
printRow2(i);
i = i + 1;
}
}
public static void printTable() {
int i = 1;
while (i <= 6) {
printRow2(i);
i = i + 1;
}
}
public static void printTable2(int rows) {
int i = 1;
while (i <= rows) {
printRow2(i);
i = i + 1;
}
}
public static void printRow3(int n, int cols) {
int i = 1;
while (i <= cols) {
System.out.printf("%4d", n * i);
i = i + 1;
}
System.out.println();
}
public static void printTable3(int rows) {
int i = 1;
while (i <= rows) {
printRow3(i, rows);
i = i + 1;
}
}
public static void printTable4(int rows) {
for (int i = 1; i <= rows; i = i + 1) {
printRow3(i, rows);
}
}
public static void printRow4(int n, int cols) {
int i;
for (i = 1; i <= cols; i = i + 1) {
System.out.printf("%4d", n * i);
}
System.out.println(i);
}
public static void main(String[] args) {
System.out.println("example");
example();
System.out.println("example2");
example2();
System.out.println("example3");
example3();
System.out.println("example4");
example4();
System.out.println("example5");
example5();
System.out.println("printRow");
printRow();
System.out.println("printRow2");
printRow2(6);
System.out.println("printTable");
printTable();
System.out.println("printTable2");
printTable2(6);
System.out.println("printRow3");
printRow3(6, 6);
System.out.println("printTable3");
printTable3(6);
System.out.println("printRow4");
printRow4(6, 6);
System.out.println("printTable4");
printTable4(6);
}
}
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