Jump statement overview in C++ - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is a jump statement in C++?

A jump statement is a command that causes the program to jump to another part of the code, changing the normal flow of execution.

beginner

Name the four main jump statements in C++.

The four main jump statements are: break, continue, return, and goto.

beginner

What does the break statement do?

The break statement immediately exits the nearest enclosing loop or switch statement.

beginner

How does the continue statement affect a loop?

The continue statement skips the rest of the current loop iteration and moves to the next iteration.

intermediate

Why should goto be used carefully?

goto can make code hard to read and debug because it jumps to any label, disrupting normal flow. Use it sparingly.

Which jump statement immediately exits a loop or switch?

A break

B continue

C return

D goto

The break statement exits the nearest loop or switch immediately.

What does the continue statement do inside a loop?

A Exits the loop

B Skips to the next iteration

C Jumps to a label

D Ends the function

continue skips the rest of the current iteration and starts the next one.

Which jump statement returns control from a function to its caller?

A return

B continue

C goto

D break

return ends the function and sends control back to the caller.

What is a risk of using goto in your code?

A It makes loops faster

B It prevents errors

C It automatically frees memory

D It can make code confusing and hard to follow

goto can jump anywhere, making code flow hard to understand.

Which jump statement would you use to skip the rest of a loop iteration but continue looping?

A break

B return

C continue

D goto

continue skips the current iteration and moves to the next one.

Explain the purpose of each jump statement in C++ and give a simple example of when to use it.

Think about loops and functions.

Describe why using goto can be problematic and what alternatives you might use instead.

Consider how code flow is affected.

Practice

1. Which jump statement in C++ is used to immediately exit a loop or switch statement?

easy

A. break

B. continue

C. return

D. goto

Solution

1. Step 1: Understand the purpose of break

   The break statement immediately exits the nearest enclosing loop or switch.

2. Step 2: Compare with other jump statements

   continue skips to the next loop iteration, return exits a function, and goto jumps to a label.

3. Final Answer:

   break -> Option A

4. Quick Check:

   Exit loop early = break [OK]

Hint: Break stops loops/switch immediately [OK]

Common Mistakes:

• Confusing break with continue
• Thinking return exits loops only
• Using goto without label

2. Which of the following is the correct syntax to skip the current iteration in a loop in C++?

easy

A. skip;

B. break;

C. continue;

D. return;

Solution

1. Step 1: Identify the statement that skips current iteration

   The continue; statement skips the rest of the current loop iteration and moves to the next.

2. Step 2: Verify syntax correctness

   skip; is invalid, break; exits loop, return; exits function.

3. Final Answer:

   continue; -> Option C

4. Quick Check:

   Skip iteration = continue [OK]

Hint: Continue skips current loop iteration [OK]

Common Mistakes:

• Using break to skip iteration
• Using return inside loops incorrectly
• Writing skip instead of continue

3. What will be the output of the following C++ code?

int main() {
    for (int i = 1; i <= 5; i++) {
        if (i == 3) continue;
        std::cout << i << " ";
    }
    return 0;
}

medium

A. 1 2 4 5

B. 1 2

C. 1 2 3 4 5

D. 3 4 5

Solution

1. Step 1: Analyze the loop and condition

   The loop runs from 1 to 5. When i == 3, continue; skips printing 3.

2. Step 2: Determine printed values

   Values 1, 2, 4, and 5 are printed with spaces.

3. Final Answer:

   1 2 4 5 -> Option A

4. Quick Check:

   Skip 3 with continue = 1 2 4 5 [OK]

Hint: Continue skips printing 3, so output excludes 3 [OK]

Common Mistakes:

• Including 3 in output
• Confusing break with continue
• Not printing spaces correctly

4. Identify the error in this C++ code snippet:

int main() {
    for (int i = 0; i < 5; i++) {
        if (i == 2) break
        std::cout << i << " ";
    }
    return 0;
}

medium

A. Missing return statement

B. Incorrect loop condition

C. Using break inside loop is invalid

D. Missing semicolon after break statement

Solution

1. Step 1: Check syntax of break statement

   The break statement must end with a semicolon. Here it is missing.

2. Step 2: Confirm other parts are correct

   The loop condition and return statement are correct; break is valid inside loops.

3. Final Answer:

   Missing semicolon after break statement -> Option D

4. Quick Check:

   break needs semicolon [OK]

Hint: Always put semicolon after break [OK]

Common Mistakes:

• Omitting semicolon after break
• Thinking break can't be inside loops
• Confusing break with continue syntax

5. Consider this C++ function:

int findFirstEven(int arr[], int size) {
    for (int i = 0; i < size; i++) {
        if (arr[i] % 2 == 0) return arr[i];
    }
    return -1;
}

What does the return statement inside the loop do?

hard

A. Skips the current iteration and continues the loop

B. Exits the loop and returns the first even number found

C. Exits the function only after the loop finishes

D. Jumps to a labeled statement

Solution

1. Step 1: Understand return inside a loop

   The return inside the loop immediately exits the function when an even number is found.

2. Step 2: Confirm behavior after return

   No further iterations or code run after return; function ends and returns value.

3. Final Answer:

   Exits the loop and returns the first even number found -> Option B

4. Quick Check:

   Return exits function immediately [OK]

Hint: Return exits function immediately, not just loop [OK]

Common Mistakes:

• Thinking return skips iteration only
• Confusing return with break
• Assuming function continues after return