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Global Variables in Programming

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Questions and Answers

Which of the following is NOT a characteristic of global variables?

Can only be initialized at the time of declaration (correct)

Visible to all functions in the program

Created when the program starts

Can be accessed from any function within the program

What is a potential issue associated with overusing global variables?

Improved isolation for testing

Easier debugging

Enhanced program understanding

Dependency issues (correct)

When are global variables destroyed in a program?

When they are not being used

When the function they are declared in ends

When the program terminates (correct)

When the program starts

What makes global variables convenient for sharing data in a program?

Visibility to all functions in the program Signup and view all the answers

Why can overuse of global variables make programs harder to debug?

They can lead to dependency issues and any function can modify them Signup and view all the answers

What are the four variables in a two-port network?

hi1, hi2, V1, V2 Signup and view all the answers

How can the relationships between V1, V2, i1, and i2 in a two-port network be expressed?

V1 = z11i1 + z12i2 and V2 = z21i1 + z22i2 Signup and view all the answers

What is the impedance matrix in the context of a two-port network?

[z11 z12; z21 z22] Signup and view all the answers

Define Z11 in a two-port network.

Input impedance of port 1 when port 2 is open-circuited Signup and view all the answers

Explain Z21 in the context of a two-port network.

Forward transfer impedance from port 1 to port 2 Signup and view all the answers