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Types in MySQL: BigInt(20) vs Int(20)
I was wondering what the difference between BigInt , MediumInt , and Int are... it would seem obvious that they would allow for larger numbers; however, I can make an Int(20) or a BigInt(20) and that would make seem that it is not necessarily about size.
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How do I determine the size of my array in C?
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Executive summary:
int a[17];
size_t n = sizeof(a)/sizeof(a[0]);
Full answer:
To determine the size of your array in bytes, you can use the sizeof
operator:
int a[17];
size_t n = sizeof(a);
On my computer, ints are 4 bytes long, so n is...
Multiple github accounts on the same computer?
...rsa AAAA... value is copied to the remote's ~/.ssh/authorized_keys file
Converting your id_rsa/id_rsa.pub key pairs to PEM format
So you want to tame you key files and cut down on some file system cruft? Converting your key pair to a single PEM is easy
$ cd ~/.ssh
$ openssl rsa -in id_rsa -outf...
C语言面试那些事儿──一道指针与数组问题 - C/C++ - 清泛网 - 专注C/C++及内核技术
...面试那些事儿──一道指针与数组问题首先看如下代码：int main(int argc, char** argv){ int a[5] = {1,2,3,4,5}; int* ptr = (int*)(&a + 1); ...首先看如下代码：
int main(int argc, char** argv)
{
int a[5] = {1,2,3,4,5};
int* ptr = (int*)(&a + 1);
pr...
'too many values to unpack', iterating over a dict. key=>string, value=>list
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Can't be iterating directly in dictionary. So you can through converting into tuple.
first_names = ['foo', 'bar']
last_names = ['gravy', 'snowman']
fields = {
'first_names': first_names,
'last_name': last_names,
}
tup_field=tuple(fields.items())
for names in fields.i...
What is the proper declaration of main?
... nor are you allowed to take its address.
The return type of main must be int. No other return type is allowed (this rule is in bold because it is very common to see incorrect programs that declare main with a return type of void; this is probably the most frequently violated rule concerning the m...
C library function to perform sort
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qsort() is the function you're looking for. You call it with a pointer to your array of data, the number of elements in that array, the size of each element and a comparison function.
It does its magic and your array is sorted in-place. An example follows:
#include <stdio.h>
#inclu...
Is it possible to print a variable's type in standard C++?
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C++11 update to a very old question: Print variable type in C++.
The accepted (and good) answer is to use typeid(a).name(), where a is a variable name.
Now in C++11 we have decltype(x), which can turn an expression into a type. And decltype() comes with its own...
What is the difference between an int and a long in C++?
...e the same, but for example on Alpha systems a long was 64 bits whereas an int was 32 bits. This article covers the rules for the Intel C++ compiler on variable platforms. To summarize:
OS arch size
Windows IA-32 4 bytes
Windows Intel 64 4 bytes
Window...
Avoid trailing zeroes in printf()
I keep stumbling on the format specifiers for the printf() family of functions. What I want is to be able to print a double (or float) with a maximum given number of digits after the decimal point. If I use:
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