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Assign one struct to another in C

...ment is supported for structs. However, there are problems: struct S { char * p; }; struct S s1, s2; s1.p = malloc(100); s2 = s1; Now the pointers of both structs point to the same block of memory - the compiler does not copy the pointed to data. It is now difficult to know which struct insta...
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How to list files in a directory in a C program?

... function to print the content of a given folder */ void show_dir_content(char * path) { DIR * d = opendir(path); // open the path if(d==NULL) return; // if was not able return struct dirent * dir; // for the directory entries while ((dir = readdir(d)) != NULL) // if we were able to read so...
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How does grep run so fast?

... how far ahead it can skip in the input whenever it finds a non-matching character. GNU grep also unrolls the inner loop of Boyer-Moore, and sets up the Boyer-Moore delta table entries in such a way that it doesn't need to do the loop exit test at every unrolled step. The result of this ...
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Get Android Phone Model programmatically

...talize(String str) { if (TextUtils.isEmpty(str)) { return str; } char[] arr = str.toCharArray(); boolean capitalizeNext = true; StringBuilder phrase = new StringBuilder(); for (char c : arr) { if (capitalizeNext && Character.isLetter(c)) { phrase.append(Character.t...
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Why do I get “a label can only be part of a statement and a declaration is not a statement” if I hav

...("Hello "); goto Cleanup; Cleanup: ; //This is an empty statement. char *str = "World\n"; printf("%s\n", str); } share | improve this answer | follow ...
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How do you pass a function as a parameter in C?

...&dosomething; func(); For a function that returns an int and takes a char you would do typedef int (*functiontype2)(char); and to use it int dosomethingwithchar(char a) { return 1; } functiontype2 func2 = &dosomethingwithchar int result = func2('a'); There are libraries that can hel...
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Detect if stdin is a terminal or pipe?

...e: #include <unistd.h> #include <stdio.h> int main(int argc, char **argv) { if (isatty(fileno(stdin))) puts("stdin is connected to a terminal"); else puts("stdin is NOT connected to a terminal"); return 0; } The following section compares different methods that can be u...
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Is an array name a pointer?

...no storage is materialized for a separate pointer or any metadata. Given char a[10]; what you get in memory is +---+ a: | | a[0] +---+ | | a[1] +---+ | | a[2] +---+ ... +---+ | | a[9] +---+ The expression a refers to the entire array, but there's no obj...
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What is the point of function pointers?

...at, float) -> float function typedef int (TMyClass::*pt2Member)(float, char, char); // defines a symbol pt2Member, pointer to a (float, char, char) -> int function // belonging to the class TMyClass The only time I have ever seen function pointers used where functors could not was in Bo...
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Difference between angle bracket < > and double quotes “ ” while including header files in C++? [dup

...tion 6.10.2): A preprocessing directive of the form # include &lt;h-char-sequence&gt; new-line searches a sequence of implementation-defined places for a header identified uniquely by the specified sequence between the &lt; and &gt; delimiters, and causes the replacement of that directi...