Josh Wieder

This question came up on Stack Exchange ; Using C, how can you write filenames dynamically using an iterative variable loop? Or in English, you want to write some stuff to a bunch of different files, and have those files named in a logical manner like file1.file, file2.file, file3.file, ... etc. The answer is pretty simple, but a bit of a mind-bender when you are first getting started. I was also pretty astonished that all of the accepted "solutions" to the problem failed to compile. This is a pretty big issue on these programming solution websites. I think the reason for the problem is there are two groups of people: There are the people who want other people to think they can fix stuff. Then there are the people who can fix stuff. The two groups, obviously, have some overlap: people who can fix stuff and who want others to know about it. But there is also a statistically significant portion of both groups that do not overlap - people who can fix stuff who don't care

Problems arise with numerical expression in computing. In reality, there are an infinite number of real numbers. However there is clearly not an infinite amount of infinite memory even in the largest of super-computers, and memory that is addressable by an application is only a fraction of the total finite available memory. How to we deal with these obstacles? We will explain more in a moment. First let's overview in more detail how the C compiler handles numeral types. Consider the application below: #include <stdio.h> int main (void) {     float f = 1 / 10;     printf("%.2f\n", f);     return 0; } Here we declare a float, 1/10 which should clearly resolve to 0.1 or 0.10 since I am declaring that printf provide a float with two digits after the decimal point. However, upon complation and excecution the program will stubbornly return a value of "0.00". Why? The issue is that I am declaring a float as an operation of two integers - 1 and