question What is the output of System out println Hello 1 2

Programming

What is the output of System.out.println("Hello" + 1 + 2);?

A. Hello3
B. Hello12
C. Hello21
D. Compile error

Concatenation from left to right: "Hello" + 1 = "Hello1", then "Hello1" + 2 = "Hello21".

What is the output of System.out.println(Math.floor(7.8));?

A. 7
B. 8
C. 7.8
D. 8.0

What is the purpose of the 'instanceof' operator in Java?

A. Check if an object is an instance of a class
B. Compare two objects
C. Check if a class is an instance of an object
D. Check if an object is null

What is the role of the 'super' keyword in Java?

A. Invoke superclass constructor
B. Refer to the subclass object
C. Invoke a static method
D. Create a superclass instance

How do you close a file in C?

A. close(file);
B. fclose(file);
C. file.close();
D. endfile(file);

How do you declare an array of function pointers in C?

A. int (*funcPtr[5])();
B. int funcPtr5;
C. (*int funcPtr[5])();
D. int *funcPtr5;

What is the role of the 'strcpy' function in C?

A. Concatenate strings
B. Copy strings
C. Compare strings
D. Convert strings

How do you declare a function pointer in C?

A. int (*funcPtr)();
B. int funcPtr();
C. (*int funcPtr)();
D. int *funcPtr();

What is the purpose of the 'try-catch' block in Java?

A. Define exceptions
B. Throw exceptions
C. Catch and handle exceptions
D. Propagate exceptions

What is Java?

A. A scripting language
B. A markup language
C. A programming language
D. A database language

What is the purpose of the 'this' keyword in Java?

A. Refer to the current object
B. Refer to the parent class
C. Refer to the child class
D. Refer to the global scope