Answer: 10 The condition is i < 5, so i takes values 1, 2, 3, 4 (NOT 5). Sum = 1+2+3+4 = 10. A common off-by-one bug if the author wanted 1..5.

How many iterations does <codefor (int i = 0; i <= 10; i++)</code perform?

Answer: 11 i = 0, 1, 2, ..., 10 → 11 values.

How many times does <codefor (int i = 5; i < 100; i += 5)</code execute?

Answer: 19 i: 5, 10, 15, ..., 95 → 19 values.

AP Computer Science A · Topic 4.5

Informal Code Analysis (Loop Tracing) Practice

Q: How many iterations does <codefor (int i = 0; i <= 10; i++)</code perform?

Answer: 11 i = 0, 1, 2, ..., 10 → 11 values.

Q: How many times does <codefor (int i = 5; i < 100; i += 5)</code execute?

Answer: 19 i: 5, 10, 15, ..., 95 → 19 values.

Part of Iteration.

Practice questions

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Sample questions

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Sample 1difficulty 2/5
```
int sum = 0;
for (int i = 1; i < 5; i++) {
 sum += i;
}
System.out.println(sum);
```
$What is printed?$
- A
 $10$
 check_circle
- B
 $5$
- C
 $14$
- D
 $15$
Why
$The condition is i < 5, so i takes values 1, 2, 3, 4 (NOT 5). Sum = 1+2+3+4 = 10. A common off-by-one bug if the author wanted 1..5.$
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Sample 2difficulty 3/5
$How many iterations does <code> for (int i = 0; i <= 10; i++) </code> perform?$
- A
 $10$
- B
 $9$
- C
 $11$
 check_circle
- D
 $12$
Why
$i = 0, 1, 2, ..., 10 \to 11 values.$
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Sample 3difficulty 3/5
$How many times does <code> for (int i = 5; i < 100; i += 5) </code> execute?$
- A
 $21$
- B
 $18$
- C
 $20$
- D
 $19$
 check_circle
Why
$i: 5, 10, 15, ..., 95 \to 19 values.$
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Sample 4difficulty 4/5
```
String result = "";
for (int i = 1; i <= 3; i++) {
 for (int j = 1; j <= i; j++) {
 result += "*";
 }
 result += "|";
}
System.out.println(result);
```
$What is printed?$
- A
 $ | | ***|$
- B
 $ | | |$
- C
 $ | |*|$
- D
 $ | | |$
 check_circle
Why
$For i=1: one " ", then "|". For i=2: two " ", then "|". For i=3: three " ", then "|". Result: " | | *|".$
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Sample 5difficulty 4/5
$<code> for (int i = 0; i <= arr.length; i++) </code> (note <code> <= </code>) on a length-5 array$
- A
 $Compile error$
- B
 $Works fine$
- C
 $Skips one element$
- D
 $Throws ArrayIndexOutOfBoundsException at i=5$
 check_circle
Why
$Valid indices are 0..length-1; <code> <= </code> would access index <code> length </code> (out of bounds).$
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