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Round a double to 2 decimal places [duplicate]
...et 200.34.
if you wanted to always round down we could always truncate by casting to an int:
double val = ....;
val = val*100;
val = (double)((int) val);
val = val /100;
This technique will work for most cases because for very large doubles (positive or negative) it may overflow. but if you know...
Create an enum with string values
...ink.LEARN: will get a Cannot convert 'Link.LEARN' to 'string' build error. Casting will not work.
– Gone Coding
Jan 16 '14 at 10:22
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Best way to detect that HTML5 is not supported
...
@2astalavista The double negative (!!) is like casting. It turns a truey or falsey statement into a boolean. For example: var i = 0. i evaluates to false, but typeof i returns "number". typeof !!i returns "boolean".
– User2
Jun 12 '1...
Why is Dictionary preferred over Hashtable in C#?
... because you can't insert any random object into it, and you don't have to cast the values you take out.
Interestingly, the Dictionary<TKey, TValue> implementation in the .NET Framework is based on the Hashtable, as you can tell from this comment in its source code:
The generic Dictionary...
How does a public key verify a signature?
...m trying to get a better grapple on how public/private keys work. I understand that a sender may add a digital signature to a document using his/her private key to essentially obtain a hash of the document, but what I do not understand is how the public key can be used to verify that signature.
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Function overloading by return type?
...le, in C++, the overload would likely have been resolvable using some ugly cast syntax.
– Michael Burr
Jan 14 '09 at 17:25
2
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Associating enums with strings in C#
...verriding the ToString method to return Value. And then provided implicit cast operators to and from a string. public static implicit operator String(LogCategory category) { return Value; }.
– Zarepheth
Jan 24 '14 at 20:17
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Compile time string hashing
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You were missing a compile flag. Moreover I had to cast to size_t the value -1 in stop recursion template function. The updated version is available here (working from Clang 3.3) : goo.gl/vPMkfB
– Clement JACOB
May 23 '14 at 12:51
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How to print a int64_t type in C
..._int = 999999999999999999;
printf("%" PRId64 "\n", my_int);
Or you could cast!
printf("%ld", (long)my_int);
printf("%lld", (long long)my_int); /* C89 didn't define `long long` */
printf("%f", (double)my_int);
If you're stuck with a C89 implementation (notably Visual Studio) you can perhaps use ...
Python's json module, converts int dictionary keys to strings
...so work for nested dicts and uses a dict comprehension.
If you want to to cast the values too, use:
def jsonKV2int(x):
if isinstance(x, dict):
return {int(k):(int(v) if isinstance(v, unicode) else v) for k,v in x.items()}
return x
Which tests the instance of the values and ca...