In the class Stack, no test is made in push ( ) for stack...

In the class Stack, no test is made in push ( ) for stack overflow. The test should be made by the user to avoid abnormal program termination. Similarly, no test for stack underflow is made in pop ( ) and in topEl ( ). The tests can be incorporated in all these member functions in a variety of ways. Here are some examples. a. void push(const $\mathrm{T} \& \mathrm{e}$, , bool& pushed) $\{\ldots\}$ In this definition, pushed would be set by push ( ) to false if stack is full and to true if el can be pushed onto the stack. The variable pushed is tested by the user after push ( ) is finished. b. bool push(const $\mathrm{T} \&$ el) $\{\ldots\}$ In this version, the return value plays the same role as pushed in the previous version. push ( ) returns true if el was pushed successfully, false otherwise. c. void push(const $T \&$ el) { if (isfull()) $\operatorname{exit}(0)$; else... Interrupt the program when an attempt is made to push an element onto a full stack, possibly printing an error message, and push the element on the stack otherwise. What are the disadvantages of these definitions?

In the class Stack, no test is made in push ( ) for stack overflow. The test should be made by the user to avoid abnormal program termination. Similarly, no test for stack underflow is made in pop ( ) and in topEl ( ). The tests can be incorporated in all these member functions in a variety of ways. Here are some examples.
a. void push(const $\mathrm{T} \& \mathrm{e}$, , bool& pushed) $\{\ldots\}$
In this definition, pushed would be set by push ( ) to false if stack is full and to true if el can be pushed onto the stack. The variable pushed is tested by the user after push ( ) is finished.
b. bool push(const $\mathrm{T} \&$ el) $\{\ldots\}$
In this version, the return value plays the same role as pushed in the previous version. push ( ) returns true if el was pushed successfully, false otherwise.
c. void push(const $T \&$ el) {
if (isfull()) $\operatorname{exit}(0)$;
else...
Interrupt the program when an attempt is made to push an element onto a full stack, possibly printing an error message, and push the element on the stack otherwise.
What are the disadvantages of these definitions?

Key Concepts

Immediate Program Termination

Immediate termination refers to halting program execution (for example, using exit on an error condition) rather than propagating an error to the caller. While this approach simplifies error handling by avoiding further processing when a problem is encountered, it also eliminates opportunities for recovery, leads to abrupt program stops, and can result in inadequate resource cleanup, making it a less flexible strategy in robust application design.

Error Handling Strategies

This concept focuses on the various techniques used to indicate success or failure in operations. In the context of stack operations, it involves choosing between returning status codes (such as booleans or flags), using output parameters, or interrupting program flow entirely. Each method has implications for how errors are managed downstream and whether they allow graceful recovery or escalate failures.

API Design and Consistency

API design examines how clearly and consistently an interface communicates both normal and exceptional behaviors to its users. The discussed definitions illustrate different ways to signal errors, yet each introduces drawbacks that may affect maintainability, code clarity, and user expectations regarding error checking. Clear and consistent APIs help prevent misuse by ensuring that error reporting is both predictable and integrated.

User Reliance on Error Checks

This concept addresses the problem of delegating error detection to the calling code. When functions require the user to verify return values or flags to detect issues like stack overflow or underflow, it can lead to bugs if the user fails to perform such checks. This reliance increases the risk of overlooked errors and inconsistent error handling across different parts of a program.

Transcript

00:01 Alright, for this question, we're asked.

00:02 Alice has three array -based stacks, and each of them has its own capacity.

00:07 Initially, a is full, and b and c are empty, but unfortunately, the person who programmed the class for these stacks made the push and pop method that's private.

00:15 So the only method that alice can use is static method dump, which transfers by iteratively applying the pop and push methods from stack s to stack t until either s becomes empty or t becomes full.

00:28 So basically keeps on applying it until one is empty or one is full.

00:32 So for example, starting from our initial configuration, performing a dump ac will result now in a holding 97 and since b only has a capacity of 5 and c only has a capacity of 3, a will have 97, c will have 3.

00:48 So we have to describe a dump operations that start from the initial configuration and result in b holding four elements at the end.

00:55 So we can think of this as a bin type of problem.

00:57 So at the start, we know a is full.

01:03 B and c are empty.

01:07 We know a has 100 and it's full.

01:10 And c, so we know the capacity of a, capacity of b, capacity of c is 5, and capacity of c is 3.

01:20 So we need to represent each of the stacks in terms of their sizes currently.

01:24 So s -a will be 100...