Answered: Any time you design code with an…

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Question

Any time you design code with an artificial limit someone
will exceed it. For example, consider the code:
void err(const char* const fmt, int a = 0, int b = 0,
int c = 0, int d = 0, int e = 0)
{
fprintf(stderr, "Fatal Error:\n");
fprintf(stderr, fmt, a, b, c, d, e);
fprintf(stderr, "\n");
abort();
}
Now this works if you wish to write simple messages:
err(“Size parameter (%d) out of range”, size);
But what happens when we wish to a slightly more complex call?
err(“Point (%d,%d) outside of box (%d,%d), (%d,%d)”,
point.x, point.y, box.x1, box.y1, box.x2, box.y2);
Our function can take a format and up to five parameters. We just gave it
six. It's not going to work.
Now we could fix the err function to add another parameter, but that
would only work until we needed seven parameter. Another change would be
needed at eight and so on.

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