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How to replace all occurrences of a string?
I have this string:
70 Answers
70
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How do I make a textbox that only accepts numbers?
...to implement such thing recently and i ended up with try-parsing resulting string to number and allowing input only if parsing succeeded
– grzegorz_p
Jan 4 '12 at 15:03
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Convert pem key to ssh-rsa format
...PubKey = NULL;
RSA* pRsa = NULL;
BIO *bio, *b64;
ERR_load_crypto_strings();
OpenSSL_add_all_algorithms();
if (argc != 3)
{
printf("usage: %s public_key_file_name ssh_key_description\n", argv[0]);
iRet = 1;
goto error;
}
pFile = fopen(argv[1], "rt");
i...
Python: Get the first character of the first string in a list?
How would I get the first character from the first string in a list in Python?
4 Answers
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What is the difference between printf() and puts() in C?
...ically appends a newline. If that's not what you want, you can fputs your string to stdout or use printf.
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What Regex would capture everything from ' mark to the end of a line?
...ed by any number of any chars [including zero chars] ending with an end of string/line token:
'.*$
And if you wanted to capture everything after the ' char but not include it in the output, you would use:
(?<=').*$
This basically says give me all characters that follow the ' char until the ...
How do I execute a command and get the output of the command within C++ using POSIX?
...stream>
#include <memory>
#include <stdexcept>
#include <string>
#include <array>
std::string exec(const char* cmd) {
std::array<char, 128> buffer;
std::string result;
std::unique_ptr<FILE, decltype(&pclose)> pipe(popen(cmd, "r"), pclose);
...
What do 'real', 'user' and 'sys' mean in the output of time(1)?
...ll keyword
So we grep source in the Bash 4.19 source code for the output string:
git grep '"user\b'
which leads us to execute_cmd.c function time_command, which uses:
gettimeofday() and getrusage() if both are available
times() otherwise
all of which are Linux system calls and POSIX functio...
What is the proper declaration of main?
...lly named argc and argv, respectively. argv is a pointer to an array of C strings representing the arguments to the program. argc is the number of arguments in the argv array.
Usually, argv[0] contains the name of the program, but this is not always the case. argv[argc] is guaranteed to be a nu...
What does the 'b' character do in front of a string literal?
...xtra character. What would be a case in v3 where you would need to use a b string as opposed to just a regular string?
– Jesse Webb
Jun 7 '11 at 19:05
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