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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...
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...
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...
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 <h-char-sequence> new-line
searches a sequence of implementation-defined places for a header identified uniquely by the specified sequence between the < and > delimiters, and causes the replacement of that directi...
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...
What character encoding should I use for a HTTP header?
I'm using a "fun" HTML special-character (✰)(see http://html5boilerplate.com/ for more info) for a Server HTTP-header and am wondering if it is "allowed" per spec.
...
What do single quotes do in C++ when used on multiple characters?
...
It's a multi-character literal. 1952805748 is 0x74657374, which decomposes as
0x74 -> 't'
0x65 -> 'e'
0x73 -> 's'
0x74 -> 't'
Edit:
C++ standard, §2.14.3/1 - Character literals
(...) An ordinary character literal that conta...
How to format a Java string with leading zero?
... your own function. That would be a much better general solution than the selected answer. docjar.com/html/api/org/apache/commons/lang/…
– kaliatech
Oct 29 '10 at 13:01
3
...
string c_str() vs. data()
...orm better than c_str().
strings don't necessarily have to be composed of character data, they could be composed with elements of any type. In those cases data() is more meaningful. c_str() in my opinion is only really useful when the elements of your string are character based.
Extra: In C++11 on...
How to change a string into uppercase
...
It works for char type as well. Thank you for your helpful answer.
– yves Baumes
Jan 16 '16 at 14:01
2
...