Question

Which statement is false?

A. all function calls in c pass arguments using call by value.
B. call by reference enables a called function to modify a variable in calling function.
C. call by value is always more efficient than call by reference.
D. programmers use pointers and indirection operation to simulate call by referense

Answer 1

Statement C is false: call by value is not always more efficient than call by reference. Programmers use pointers and indirection operation to simulate call by reference.

Step-by-step explanation:

Statement C is false: call by value is not always more efficient than call by reference. While call by value can be more efficient for small data types, call by reference can be more efficient when working with large data types. This is because when passing an argument by reference, only the memory address of the variable is passed, not the entire value. This can save memory and improve performance.

Programmers use pointers and indirection operation to simulate call by reference. By passing the memory address of a variable, a function can modify the original variable in the calling function. This is useful when you want a function to have side effects and modify the state of variables outside its scope.

Call by value and call by reference are two different ways of passing arguments to a function in C. Call by value copies the value of the argument to the function's parameter, while call by reference passes the memory address of the argument. Each method has its own advantages and can be used depending on the specific requirements of the program.