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Is “argv[0] = name-of-executable” an accepted standard or just a common convention?
...1 states (my emphasis):
If the value of argc is greater than zero, the string pointed to by argv[0] represents the program name; argv[0][0] shall be the null character if the program name is not available from the host environment.
So no, it's only the program name if that name is available. A...
How to export data as CSV format from SQL Server using sqlcmd?
...the output, and it will also filter out legitimate lines that contain that string.
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__attribute__ - C/C++ - 清泛网 - 专注C/C++及内核技术
...些很难发现的bug。
format的语法格式为：
format (archetype, string-index, first-to-check)
format属性告诉编译器，按照printf, scanf,
strftime或strfmon的参数表格式规则对该函数的参数进行检查。“archetype”指定是哪种风格；“string-index...
What is an unsigned char?
...type of character literals like 'a' or '0'.
it is the type that makes up C strings like "abcde"
It also works out as a number value, but it is unspecified whether that value is treated as signed or unsigned. Beware character comparisons through inequalities - although if you limit yourself to ASCI...
How to convert an enum type variable to a string?
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There really is no beautiful way of doing this. Just set up an array of strings indexed by the enum.
If you do a lot of output, you can define an operator<< that takes an enum parameter and does the lookup for you.
...
maximum value of int
... time how many bits the int has on machine or compiler nor need we include extra libraries.
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Java - Convert integer to string [duplicate]
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There are multiple ways:
String.valueOf(number) (my preference)
"" + number (I don't know how the compiler handles it, perhaps it is as efficient as the above)
Integer.toString(number)
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Random string generation with upper case letters and digits
I want to generate a string of size N.
31 Answers
31
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How can I hash a password in Java?
...der enc = Base64.getEncoder();
System.out.printf("salt: %s%n", enc.encodeToString(salt));
System.out.printf("hash: %s%n", enc.encodeToString(hash));
Here's a utility class that you can use for PBKDF2 password authentication:
import java.security.NoSuchAlgorithmException;
import java.security.Secu...
Count character occurrences in a string in C++
How can I count the number of "_" in a string like "bla_bla_blabla_bla" ?
13 Answers
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