C Archives - Page 13 of 22

What does the constant 0.0039215689 represent?

I keep seeing this constant pop up in various graphics header files 0.0039215689 It seems to have something to do with color maybe? ...

May 15, 2022
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What is a bus error? Is it different from a segmentation fault?

What does the “bus error” message mean, and how does it differ from a segmentation fault? 18 Answers 18

May 15, 2022
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What does a type followed by _t (underscore-t) represent?

This seems like a simple question, but I can’t find it with the Stack Overflow search or Google. What does a type followed ...

May 15, 2022
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Extracting bits with a single multiplication

I saw an interesting technique used in an answer to another question, and would like to understand it a little better. We’re given ...

May 15, 2022
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Removing trailing newline character from fgets() input

I am trying to get some data from the user and send it to another function in gcc. The code is something like ...

May 15, 2022
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strdup() – what does it do in C?

What is the purpose of the strdup() function in C? 10 Answers 10

May 15, 2022
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How to convert an int to string in C?

How do you convert an int (integer) to a string? I’m trying to make a function that converts the data of a struct ...

May 15, 2022
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How to escape the % (percent) sign in C’s printf

How do you escape the % sign when using printf in C? printf("hello\%"); /* not like this */ 13 Answers 13

May 15, 2022
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When should I use mmap for file access?

POSIX environments provide at least two ways of accessing files. There’s the standard system calls open(), read(), write(), and friends, but there’s also ...

May 15, 2022
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Why do I get a segmentation fault when writing to a “char *s” initialized with a string literal, but not “char s[]”?

The following code receives seg fault on line 2: char *str = "string"; str[0] = 'z'; // could be also written as *str="z" ...

May 15, 2022
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