Else–if ladder in C++ - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is an else-if ladder in C++?

An else-if ladder is a series of if-else statements used to check multiple conditions one after another. It helps decide which block of code to run based on different conditions.

beginner

How does the else-if ladder work in C++?

The program checks each if or else-if condition from top to bottom. When it finds a true condition, it runs that block and skips the rest.

beginner

Write a simple else-if ladder to check if a number is positive, negative, or zero.

Example: int num = 5; if (num > 0) { // positive } else if (num < 0) { // negative } else { // zero }

intermediate

Why use else-if ladder instead of multiple if statements?

Else-if ladder stops checking conditions once one is true, making the program faster and avoiding running multiple blocks when only one should run.

beginner

Can else-if ladder have an else block? What is its purpose?

Yes, the else block runs if none of the if or else-if conditions are true. It acts as a default case.

What happens when an else-if condition is true in a ladder?

A Only the last block runs

B All blocks run regardless

C The program crashes

D The corresponding block runs and the rest are skipped

In an else-if ladder, once a true condition is found, its block runs and the rest are skipped.

Which keyword starts an else-if ladder in C++?

A elif

B else if

C elseif

D else

The correct syntax in C++ is 'else if' with a space.

What is the role of the else block in an else-if ladder?

A Runs only if the first condition is true

B Runs before all conditions

C Runs if no previous condition is true

D Is optional and never runs

The else block runs only if all previous if and else-if conditions are false.

Why is an else-if ladder more efficient than multiple separate if statements?

A It stops checking after the first true condition

B It runs all conditions faster

C It uses less memory

D It allows multiple blocks to run

Else-if ladder stops checking conditions once one is true, saving time.

Which of these is a correct else-if ladder syntax in C++?

A if (x>0) {} else if (x<0) {} else {}

B if (x>0) {} elseif (x<0) {} else {}

C if (x>0) {} else (x<0) {} else {}

D if (x>0) {} else if(x<0) else {}

Option A uses correct syntax with 'else if' and proper braces.

Explain how an else-if ladder controls program flow in C++.

Think about how the program decides which code to run based on conditions.

Write a simple else-if ladder to classify a number as positive, negative, or zero.

Use if, else if, and else keywords with comparison operators.