All Flashcards
What is iteration?
Repeating a block of code.
What is a while loop?
A loop that executes while a condition is true.
What is a for loop?
A loop with initialization, condition, and iteration in one line.
What is a nested loop?
A loop inside another loop.
What is string traversal?
Processing a string character by character.
What is tracing?
Manually executing code step-by-step.
What is an infinite loop?
A loop that never terminates.
What is the body of a loop?
The code that is executed repeatedly.
What is a loop condition?
The boolean expression that determines if a loop continues.
What is the modifier in a loop?
The statement that changes the loop variable.
What are the steps to reverse a string using a loop?
- Initialize an empty string. 2. Iterate through the original string from the last character to the first. 3. Append each character to the new string.
What are the general steps for using a while loop?
- Initialize a counter variable. 2. Write the
whileloop condition. 3. Include the code to be executed within the loop. 4. Update the counter variable inside the loop.
What are the general steps for using a for loop?
- Initialize the loop variable in the for loop declaration. 2. Define the loop condition. 3. Specify the increment/decrement operation. 4. Include the code to be executed within the loop.
What are the steps to trace a loop?
- Create a table with variables. 2. Execute each line of code. 3. Update the table with the new values. 4. Check the loop condition.
What are the steps to find a specific substring?
- Iterate through the string. 2. Extract a substring of the same length as the target substring. 3. Compare the extracted substring with the target substring. 4. If they are equal, return true; otherwise, continue.
What does the following code output?
java
int i = 0;
while (i < 3) {
System.out.print(i);
i++;
}
012
What does the following code output?
java
for (int i = 1; i <= 4; i++) {
System.out.print(i + " ");
}
1 2 3 4
What does the following code output?
java
String str = "hello";
String reversed = "";
for (int i = str.length() - 1; i >= 0; i--) {
reversed += str.charAt(i);
}
System.out.println(reversed);
olleh
What does the following code output?
java
int sum = 0;
for (int i = 0; i < 5; i++) {
sum += i;
}
System.out.println(sum);
10
What does the following code output?
java
String str = "programming";
int count = 0;
for (int i = 0; i < str.length(); i++) {
if (str.charAt(i) == 'g') {
count++;
}
}
System.out.println(count);
2
Identify the error in the following code:
java
int i = 0;
while (i < 5) {
System.out.println("Hello");
}
The loop will run infinitely because i is never incremented.
Identify the error in the following code:
java
for (int i = 5; i >= 0;)
System.out.println(i);
Missing the increment/decrement statement in the for loop, and missing curly braces. The condition will always be true, resulting in infinite loop.
What does the following code output?
java
int x = 1;
while (x < 10) {
x = x + 3;
}
System.out.println(x);
10
What does the following code output?
java
String s = "APCSA";
for (int i = 0; i < s.length(); i++) {
System.out.print(s.substring(i, i + 1));
}
APCSA
What does the following code output?
java
int n = 5;
for (int i = 1; i <= n; i++) {
for (int j = 1; j <= i; j++) {
System.out.print("*");
}
System.out.println();
}
**