Anything related to `c_str` method of class `std::basic_string` of C++ standard library.
Anything related to c_str method of class std::basic_string of C++ standard library.
See documentation of c_str on CPPreference.com.
Questions tagged [c-str]
73 questions
1
vote
1 answer
c_str() equivalent in C
I've just started using C programming language for coding my course project and I'm not much knowledgeable about C. I've been using C++ for a while now and I need to find an alternative to c_str() function in C. I'm trying to code (in C) similar to…
Pranav
- 560
- 1
- 8
- 21
1
vote
3 answers
C++ c_str() doesn't return complete string
I'm doing a C++ assignment that requires taking user input of an expression (eg: 2 * (6-1) + 2 ) and outputting the result. Everything works correctly unless a space is encountered in the user input.
It is a requirement to pass the user input to the…
AgentOrange
- 65
- 2
- 11
1
vote
1 answer
assignment of c_str() to a string
I have a problem which i cannot fix on my own.
string filenameRaw;
filenameRaw= argv[1];
function(filenameRaw.c_str(),...);
function(const char* rawDataFile,const char* targetfieldFile,const char* resultFile,const char*…
raspiede
- 179
- 1
- 1
- 11
1
vote
1 answer
avoiding to use temp strings with .c_str command?
I'm wondering if there is a way to avoid using a temporary string in this case:
tempString = inputString.substr(commaLast,commaCurrent-1);
yPos = strtod(tempString.c_str(), NULL);
There is no way to use the substr command and returning a c_str…
jimspree1200
- 15
- 3
0
votes
1 answer
Why doesn't string class take in two words separated with space?
I want to take in persons name using string object. But in my code if I put two part name separated with a space, only first part is displayed. My understanding is .c_str() returns a pointer to stored string with terminal null. Why is there a…
ChandanaHK
- 3
- 1
0
votes
1 answer
Accidentally linking c_str() strings
I'm trying to assign a string to a struct value, which works, but the value somehow links to the variable:
string tmp;
struct test_struct{
const char *server, *user;
};
test_struct test;
tmp = "foo";
test.server = tmp.c_str();
cout <<…
Alexander Minor
- 31
- 4
0
votes
0 answers
Implementing string to int function in c
I am trying to implement a function as stated in the title. I think I am very close to solution but a problem.
input: 51% are admitted.
output: x:51 (null)
but output should have been:
s:% are admitted.
My try is here:
#include…
akoluacik
- 33
- 5
0
votes
3 answers
Curious behaviour of c_str() and strings when passed to class
I came across a curious behaviour (and I am sure it is just curious to me and there exists a perfectly valid c++ answer) when playing around with c-strings and std::string. Typically, when I pass a string to a class' constructor, I do something like…
tom
- 361
- 3
- 11
0
votes
3 answers
Getting char * or const char * data from a string breaks for 16 character strings or longer
I have a function string_to_char() which attempts to give me a form of a string which I can pass into a library I am using, which wants char * (but I think works with const char *, so I've been trying both).
The code I wrote to test my…
Joss
- 67
- 6
0
votes
2 answers
c_str() is terminating my encrypted message is there a way to bypass this?
I am encrypting a message using RSA.
Everything works fine if I try to encrypt/decrypt the message locally, however, when converting the string to void constant* in order to use the socket::send method like so,
int sendRes = send(socket,…
Edgar Hernandez
- 41
- 1
- 8
0
votes
0 answers
single vs double quotes C++ - interesting, unexpected behaviour
I found some pretty weird behaviour when I was trying to debug my C++ code for an unrelated problem.
I am printing a result at a stage in the program at which I have the integer variables 'amount' and 'coins[i]' as:
std::cout << "Found, 1! n = " << …
tam63
- 191
- 10
0
votes
0 answers
Why is c_str() not reading the appended string?
I am currently working on a project where I take an ASCII image .txt file and have it sent to a mySQL database. I have the program read each row of the .txt file and have it appended to a mySQL command string. All is well until I have the string…
katsurice
- 1
- 1
0
votes
3 answers
The lifetime of pointer that point to c_str function in std::string
Firstly the code listed as follow.
#include
#include
int main(){
const char *cs;
{
std::string s("123456");
cs = s.c_str();
printf("cs = %s\n",cs);
}
printf("cs = %s\n",cs);
return…
Andy Cong
- 109
- 1
- 10
0
votes
2 answers
Strchr and strrchr returning same result
For some reason, whether I try strchr or strrchr, I get the same value returned. I have no idea why.
Here is the segment of code giving me trouble:
printf("Enter a data point (-1 to stop input):\n");
fgets(input, 50, stdin);
char…
mperic
- 118
- 9
0
votes
4 answers
Can you safely get a pointer to a string from its c_str() const char*?
I have a const char pointer which I know for sure came from a string. For example:
std::string myString = "Hello World!";
const char* myCstring = myString.c_str();
In my case I know myCstring came from a string, but I no longer have access to that…
The Mawg
- 13
- 5