Day 4: Loop Logic

🔁 Day 4: Loop Logic

🧠 Main Concepts Today:

  • Understand the logic behind questions.
  • Practice concatenation in loops (joining values into a string).
  • Implement logic using while loops.

🧩 Pattern Practice: Let's Understand These Patterns

We'll write logic for the following patterns:

1) 7,10,8,11,9,12
2) 22,21,23,22,24,23
3) 53,53,40,40,27,27
4) 3,6,9,24,48,96
5) 36,34,30,28,24
6) 8,22,8,28,8,34
7) 120,99,80,63,48
8) 25,10,17,26

✏️ Java Code (Main Focus)

Let’s write Java logic with while or for loops and String concatenation using +.

🔹 1. Pattern: 7,10,8,11,9,12 

int a = 7, b = 10;
for (int i = 0; i < 3; i++) {
    System.out.print(a + "," + b + ",");
    a++;
    b++;
}

Output: 7,10,8,11,9,12,

🔹 2. Pattern: 22,21,23,22,24,23 

int x = 22, y = 21;
for (int i = 0; i < 3; i++) {
    System.out.print(x + "," + y + ",");
    x++;
    y++;
}

🔹 3. Pattern: 53,53,40,40,27,27 

int i = 53;
while (i >= 27) {
    System.out.print(i + "," + i + ",");
    i -= 13;
}

🔹 4. Pattern: 3,6,9,24,48,96 

int[] first = {3, 6, 9};
for (int num : first) {
    System.out.print(num + ",");
}
int val = 24;
while (val <= 96) {
    System.out.print(val + ",");
    val *= 2;
}

🔹 5. Pattern: 36,34,30,28,24 

for (int i = 36; i >= 24; i -= (i % 2 == 0 ? 2 : 4)) {
    System.out.print(i + ",");
}

(Simpler version:)

int[] arr = {36, 34, 30, 28, 24};
for (int i : arr) {
    System.out.print(i + ",");
}

🔹 6. Pattern: 8,22,8,28,8,34 

int fixed = 8, change = 22;
for (int i = 0; i < 3; i++) {
    System.out.print(fixed + "," + change + ",");
    change += 6;
}

🔹 7. Pattern: 120,99,80,63,48 

int[] nums = {120, 99, 80, 63, 48};
for (int n : nums) {
    System.out.print(n + ",");
}

🔹 8. Pattern: 25,10,17,26 

int[] lastPattern = {25, 10, 17, 26};
for (int n : lastPattern) {
    System.out.print(n + ",");
}

🧠 What I Understood

  • Before coding, I need to analyze the pattern logic.
  • Understand if it's repeating, alternating, or increasing/decreasing.
  • Store and combine values with string concatenation.