A string in the programming language C is represented as a sequence of characters followed by a null terminator (represented as \0).
Questions tagged [c-strings]
2715 questions
31
votes
5 answers
Converting String to Cstring in C++
I have a string to convert, string = "apple" and want to put that into a C string of this style, char *c, that holds {a, p, p, l, e, '\0'}. Which predefined method should I be using?
teamaster
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29
votes
4 answers
How to use memset while handling strings in C++?
I am from Python background and recently learning C++. I was learning a C/C++ function called memset and following the online example from website https://www.geeksforgeeks.org/memset-in-cpp/ where I got some compilation errors:
/**
* @author …
BhishanPoudel
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29
votes
5 answers
Determine #defined string length at compile time
I have a C-program (an Apache module, i.e. the program runs often), which is going to write() a 0-terminated string over a socket, so I need to know its length.
The string is #defined as:
#define POLICY "\n" \
"
Alexander Farber
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28
votes
4 answers
Strip first and last character from C string
I have a C string that looks like "Nmy stringP", where N and P can be any character. How can I edit it into "my string" in C?
igul222
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25
votes
6 answers
strncpy or strlcpy in my case
what should I use when I want to copy src_str to dst_arr and why?
char dst_arr[10];
char *src_str = "hello";
PS: my head is spinning faster than the disk of my computer after reading a lot of things on how good or bad is strncpy and strlcpy.…
hari
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25
votes
3 answers
Is there anyway to create null terminated string in Go?
Is there anyway to create null terminated string in Go?
What I'm currently trying is a:="golang\0" but it is showing compilation error:
non-octal character in escape sequence: "
Yash Srivastava
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25
votes
3 answers
What is the reason for not being able to deduce array size from initializer-string in member variable?
Consider the code:
struct Foo
{
const char str[] = "test";
};
int main()
{
Foo foo;
}
It fails to compile with both g++ and clang++, spitting out essentially
error: array bound cannot be deduced from an in-class initializer
I…
vsoftco
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25
votes
3 answers
Is sprintf(buffer, "%s […]", buffer, […]) safe?
I saw use of this pattern to concatenate onto a string in some code I was working on:
sprintf(buffer, "%s \r\n", buffer, id);
sprintf(buffer, "%s", buffer);
and I'm fairly certain it's not safe C. You'll notice…
Paul Fisher
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24
votes
4 answers
Where does const char* get the pointer to a memory address?
This may be simple question, but why does a const char* not need a memory address to point to?
Example:
const char* a = "Anthony";
and not:
const char *a = // Address to const char
like any other types do?
Weidelix
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23
votes
2 answers
Why Doesn't string::data() Provide a Mutable char*?
In c++11 array, string, and vector all got the data method which:
Returns pointer to the underlying array serving as element storage. The pointer is such that range [data(); data() + size()) is always a valid range, even if the container is empty.
…
Jonathan Mee
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22
votes
9 answers
'\0' and printf() in C
In an introductory course of C, I have learned that while storing the strings are stored with null character \0 at the end of it. But what if I wanted to print a string, say printf("hello") although I've found that that it doesn't end with \0 by…
xrfxlp
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22
votes
9 answers
If char*s are read only, why can I overwrite them?
My course taught me that char*s are static/read only so I thought that would mean you can't edit them after you have defined them. But when I run:
char* fruit = "banana";
printf("fruit is %s\n", fruit);
fruit = "apple";
printf("fruit is %s\n",…
sally2000
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21
votes
6 answers
Selecting only the first few characters in a string C++
I want to select the first 8 characters of a string using C++. Right now I create a temporary string which is 8 characters long, and fill it with the first 8 characters of another string.
However, if the other string is not 8 characters long, I am…
user3483203
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21
votes
4 answers
C string to uppercase in C and C++
While I was putting together a to-uppercase function in C++ I noticed that I did not receive the expected output in C.
C++ function
#include
#include
#include
void strupp(char* beg)
{
while (*beg++ =…
Alex Koukoulas
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20
votes
4 answers
Proper way to copy C strings
Is there an easy way to copy C strings?
I have const char *stringA, and I want char *stringB to take the value (note that stringB is not const). I tried stringB=(char*) stringA, but that makes stringB still point to the same memory location, so when…
Cannoliopsida
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