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Patterns.java
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Patterns.java
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// All patterns
package patterns;
import java.util.Scanner;
public class Patterns {
static int row = 1;
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
System.out.print("Enter number of rows: ");
int n = sc.nextInt();
sc.close();
reset(1);
// Pattern 1
// ****
// ****
// ****
// ****
for (row = 1; row <= n; row++) {
for (int col = 1; col <= n; col++) {
System.out.print("*");
}
System.out.println();
}
reset(2);
// Pattern 2
// 1111
// 2222
// 3333
// 4444
for (row = 1; row <= n; row++) {
for (int col = 1; col <= n; col++) {
System.out.print(row);
}
System.out.println();
}
// Pattern 3
// 1234
// 1234
// 1234
// 1234
reset(3);
for (row = 1; row <= n; row++) {
for (int col = 1; col <= n; col++) {
System.out.print(col);
}
System.out.println();
}
// Pattern 4
// 4321
// 4321
// 4321
// 4321
reset(4);
for (row = 1; row <= n; row++) {
for (int col = 1; col <= n; col++) {
System.out.print(n - col + 1);
}
System.out.println();
}
// Pattern 5
// 1
// 12
// 123
// 1234
reset(5);
for (row = 1; row <= n; row++) {
for (int col = 1; col <= row; col++) {
System.out.print(col);
}
System.out.println();
}
// Pattern 6
// 1
// 23
// 345
// 4567
reset(6);
for (row = 1; row <= n; row++) {
int startNum = row;
for (int col = 1; col <= row; col++) {
System.out.print(startNum);
startNum++;
}
System.out.println();
}
// Pattern 7
// 1
// 23
// 456
// 78910
reset(7);
// because we don't want to reset the startNum, so declared outside
int startNum = 1;
for (row = 1; row <= n; row++) {
for (int col = 1; col <= row; col++) {
System.out.print(startNum);
startNum++;
}
System.out.println();
}
reset(8);
// Pattern 8
// A
// AB
// ABC
// ABCD
for (row = 1; row <= n; row++) {
for (int col = 1; col <= row; col++) {
char a = 'A';
System.out.print((char) (a + col - 1));
}
System.out.println();
}
reset(9);
// A
// BC
// DEF
// GHIJ
int start = 1;
for (row = 1; row <= n; row++) {
for (int col = 1; col <= row; col++) {
char a = 'A';
System.out.print((char) (a + start - 1));
start++;
}
System.out.println();
}
reset(10);
// A
// BC
// DEF
// GHIJ
int start1 = 1;
for (row = 1; row <= n; row++) {
for (int col = 1; col <= n; col++) {
char a = 'A';
System.out.print((char) (a + start1 - 1));
start1++;
}
System.out.println();
}
// Pattern 11
reset(11);
// *
// **
// ***
// ****
// reverse
for (row = 1; row <= n; row++) {
for (int col = 1; col <= n - row; col++) {
System.out.print(" ");
}
for (int col = 1; col <= row; col++) {
System.out.print("*");
}
System.out.println();
}
// Pattern 12
reset(12);
// ****
// ***H
// **HH
// *HHH
// opposite
for (row = 1; row <= n; row++) {
for (int col = 1; col <= n - row + 1; col++) {
System.out.print("*");
}
for (int col = 1; col <= row - 1; col++) {
System.out.print("S");
}
System.out.println();
}
// Pattern 13
reset(13);
// 1
// 121
// 12321
// 1234321
for (row = 1; row <= n; row++) {
int s = 1;
// first spaces
for (int col = 1; col <= n - row; col++) {
System.out.print(" ");
}
// then numbers
for (int col = 1; col <= row; col++) {
System.out.print(s);
s++;
}
// then decreasing numbers
s = row - 1; // start with row - 1
for (int col = 1; col <= row - 1; col++) {
System.out.print(s);
s--;
}
System.out.println();
}
}
static void reset(Integer patternNumber) {
row = 1;
System.out.println("\nPattern " + patternNumber.toString());
}
}