Iteration in Programming

What is the primary purpose of iteration in programming?

What will be the value of x after the following code is executed?

java
int x = 0;
int i = 5;
while (i > 0) {
  x += i;
  i--;
}

What will be the output of the following code snippet?

java
int sum = 0;
for (int i = 1; i <= 4; i++) {
  sum += i;
}
System.out.println(sum);

Given the string String str = "hello";, what is the value of str.length()?

What will be the output of the following code snippet?

java
int i = 0;
while (i < 3) {
  System.out.print(i);
  i++;
}

How many times will the following for loop execute?

java
for (int i = 0; i < 10; i++) {
  System.out.println(i);
}

What is the final value of j after the following code executes?

java
int j = 0;
for (int i = 0; i < 5; i += 2) {
 j += i;
}

Which code segment correctly checks if the string str contains the substring sub?

Consider the following code:

java
int i = 0;
while (i < 5) {
  if (i % 2 == 0) {
    System.out.print(i + " ");
  }
}

What is the most significant problem with this loop?

Consider the following nested loop:

java
for (int i = 0; i < 3; i++) {
  for (int j = 0; j < 4; j++) {
    System.out.print("*");
  }
}

How many times will the System.out.print("*"); statement execute?