Test: Functions - 1 - EmSAT Achieve MCQ

A function is a reusable block of code that performs a specific task. It helps in organizing code, making it modular and reusable.

The "return" statement is used to exit a function and return a value to the caller. It can also be used to return None if no value is specified.

Void functions are functions that do not return a value. They perform a task without returning any output.

Actual parameters, also known as arguments, are the values passed to a function during function call. Formal parameters, also known as parameters or variables, are defined in the function's signature and receive values from the actual parameters.

The keyword "def" is used to define a function in Python. It is followed by the function name and parentheses containing any parameters.

The add_numbers function takes two parameters, adds them, and returns the sum. The function is called with arguments 3 and 7, so the sum is 3 + 7 = 10, which is printed as the output.

The greet function has a default argument "name" set to "Guest." When called with an argument "Alice," it prints "Hello, Alice!" as the first output. When called without any arguments, it uses the default value and prints "Hello, Guest!" as the second output.

The function change_x modifies the value of the global variable x using the global keyword. When the function is called, the value of x is changed to 10. Therefore, the output is 10.

The square function squares its input parameter. In this case, square(2) returns 4. Then, square(4) is called, which returns 16. Finally, 16 is printed as the output.

The multiply function multiplies its two parameters. In this case, it is called with arguments 5 and 3, so the result is 5 * 3 = 15, which is printed as the output.

The square function calls the increment function to increment the input parameter x by 1. In this case, square(3) calls increment(3), which returns 4. Then, 4 is squared, resulting in 16.

The outer_function defines a variable x and calls the inner_function, which uses the nonlocal keyword to access and modify the outer variable x. After calling inner_function, the value of x is 15, which is printed as the output.

The power function calculates the power of a number recursively. In this case, power(2, 4) calculates 2 to the power of 4, which is 16.

The multiply function multiplies the arguments passed to it. In this case, it is called with arguments 2, 3, 4, and 5. The result is calculated as 2 * 3 * 4 * 5 = 60, which is printed as the output.

The outer function defines a variable x and calls the inner function, which uses the nonlocal keyword to modify the outer variable x. After calling inner, the value of x is changed to 10, which is printed as the output.