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深入浅出计算机字符集编码 - C/C++ - 清泛网 - 专注C/C++及内核技术
...一致:
void printStringByChar(std::string &str) {
char *p = const_cast<char *> (str.c_str());
char q[1024];
while (*p != '\0') {
sprintf(q, "%02x, %u, %c", *p, *p, *p);
std::cout << q << std::endl;
p++;
}
}
(十六进制,无符号整形,字符型)
Shift-jis:
0xff...
What is a wrapper class?
...ed to write a big code . However, the same can be achieved with the simple casting technique as code snippet can be achieved as below
double d = 135.0;
int integerValue = (int) d ;
Though double value is explicitly converted to integer value also called as downcasting.
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Convert data.frame columns from factors to characters
...ata frame. One option is to use the above but then use type.convert after casting everything to character, then recast factors back to character again.
– Shane
May 17 '10 at 18:56
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How can I force division to be floating point? Division keeps rounding down to 0?
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You can cast to float by doing c = a / float(b). If the numerator or denominator is a float, then the result will be also.
A caveat: as commenters have pointed out, this won't work if b might be something other than an integer or ...
Increment a value in Postgres
...aracter varying + integer LINE 2: SET total = total + 1 Solved by casting the value as integer like this SET total = total::int + 1
– Stew-au
Oct 31 '12 at 3:05
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Combining two lists and removing duplicates, without removing duplicates in original list
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Finally an answer that doesn't involve casting into sets! Kudos.
– SuperFamousGuy
Mar 25 '13 at 18:33
4
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Return rows in random order [duplicate]
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Here's an example (source):
SET @randomId = Cast(((@maxValue + 1) - @minValue) * Rand() + @minValue AS tinyint);
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g++ undefined reference to typeinfo
...Such access can happen when you create an object of the class, use dynamic_cast etc.
[source]
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how to concatenate two dictionaries to create a new one in Python? [duplicate]
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It does work in Python 3, but you have to cast the dict_items objects to real list objects. This is another case where Python 3 prioritised minor performance optimisations over simplicity and ease of use.
– Carl Smith
Apr 12 '17...
getApplicationContext(), getBaseContext(), getApplication(), getParent()
...istered in the Manifest, you should never call getApplicationContext() and cast it to your application, because it may not be the application instance (which you obviously experienced with the test framework).
getParent() returns object of the activity if the current view is a child..In other words...
