Programming Languages FC0-U71 Practice Questions (Page 6)

Questions 26–28

1. 26expert · medium

   A developer is writing a function that should return the sum of all numbers from 1 to n. The developer writes: function sum(n) { if (n <= 0) return 0; else return n + sum(n-1); }. What is the result of sum(5)?

   • AAn infinite loop occurs
   • BA stack overflow error occurs
   • C10
   • D15
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2. 27application · medium

   A team is building a web application with a complex user interface that needs to respond to user interactions without page reloads. They also need to reuse code across the front end and back end. Which language choice best supports these needs?

   • AJavaScript, because it runs in the browser and can also run on the server with Node.js.
   • BPython, because it is easy to learn and has many libraries.
   • CC#, because it is object-oriented and compiled.
   • DJava, because it is platform-independent and secure.
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3. 28application · medium

   A developer is reviewing code and sees the following line: if (x = 10) { ... }. In many languages, this is a logic error. Why?

   • AThe assignment operator is used instead of the equality operator, so the condition always evaluates to true.
   • BThe variable x is not declared, so the code will not compile.
   • CThe equality operator is used instead of the assignment operator, so the condition is always false.
   • DThe condition is missing a semicolon, causing a syntax error.
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