Member Avatar for suresh1010

can u please temme the string funtion which will eliminate the character in the desired position in C++.
ie in (string.h)

example
i need to remove the 4th character in "SACRED"
so the resultant array must be "SACED"
without a blank space in the deleted postion.
so the size gets reduced by one.
i am new to this field.. help me put pls

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  • Latest Post Latest Post by Ancient Dragon

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Brief expert note tied to the thread: OP () wanted the 4th character removed from "SACRED". pointed to the standard C++ solution and clarified the namespace issue; correctly suggested shifting the remainder for C-style arrays and flagged the overlap/UB concern. The practical guidance below keeps those points and gives safe, ready-to-use code for both modern C++ and plain C strings.

For modern C++ (std::string), do a bounds-checked erase using an iterator (this avoids repeating the exact snippet already shown earlier):

#include <string>

void remove_1based(std::string &s, size_t oneBasedPos) {
    if (oneBasedPos == 0) return;            // nothing to do
    size_t pos = oneBasedPos - 1;            // convert to zero-based
    if (pos < s.size()) s.erase(s.begin() + pos);
}

For C-style char arrays (when a std::string is not available), move the trailing bytes left with memmove (safe for overlapping memory). The third argument counts bytes and must include the terminating NUL:

#include <cstring>

void remove_at(char *str, size_t pos /* zero-based */) {
    size_t len = strlen(str);
    if (pos < len) memmove(str + pos, str + pos + 1, len - pos);
}

Notes and cautions: include <string> for std::string and <cstring> (or string.h) for strlen/memmove. Turbo C++ is dated and may not provide the modern std::string API; prefer a standards-compliant compiler (GCC/Clang/MSVC) if possible. Remember that std::string and these C APIs operate on bytes—multibyte encodings (UTF‑8) require care if “characters” mean user-perceived glyphs.

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All 13 Replies

Member Avatar for codeaa 
string s = "SACRED";
s.erase(3,1);
Member Avatar for suresh1010 
string s = "SACRED";
s.erase(3,1);

.. thanks...
but i hav tried this one out , but in turbo Cpp compiler...
it pops an error tat.. dot operator is (.) is not allowed..
is it the exact function...

i need explanation pls...

Member Avatar for Ancient Dragon

You need to post what you are attempting to do because its a little difficult for us to see your computer screen :) But I suspect you are asking about character arrays insterad of c++ strings.

If that's the case, there are a couple ways to do it. One way is to use strcpy() function

char str[] = "SACRED";
strcpy( &str[2], &str[3]);

I didn't compile or test that, but I think it will work.

Member Avatar for Nick Evan

.. thanks...
but i hav tried this one out , but in turbo Cpp compiler...
it pops an error tat.. dot operator is (.) is not allowed..
is it the exact function...

The code is ok, but codeaa probaly uses a using namespace std; in his code. Although this works, it is recommended to type in the namespace manually due to overhead.
So try this:

std::string s = "SACRED";
s.erase(3,1);

And don't forget to #include <iostream> Niek

[edit] too slow again.. Use Ancient Dragon's solution of you're working with char[]

Member Avatar for codeaa

niek_e is right and I should have explained more.

The erase function takes two parameters. The first is the index of the character to be removed and the second is the number of characters to be removed.

Member Avatar for atish00

is the s.erase user defined fuction ?? coz I can't find it anywhere in c++ help.

Member Avatar for hammerhead

is the s.erase user defined fuction ?? coz I can't find it anywhere in c++ help.

Which version of C++ are you using? It is not there in Turbo C++.

Member Avatar for Dave Sinkula

If that's the case, there are a couple ways to do it. One way is to use strcpy() function

char str[] = "SACRED";
strcpy( &str[2], &str[3]);

I didn't compile or test that, but I think it will work.

Undefined behavior.

Member Avatar for atish00

strcpy copies strings so far my teacher has taught me a very tough prog that is

if the array index of element is x,
overite by doing x-1.

Member Avatar for Ancient Dragon

Undefined behavior.

Source and destination strings do not overlap, they are simply in the same buffer, so where's the undefined behavior?

Member Avatar for Dave Sinkula

Source and destination strings do not overlap, they are simply in the same buffer, so where's the undefined behavior?

Oops, sorry, my bad.

Member Avatar for Ancient Dragon

From what I read in those links looks like I was wrong. Should have used memmov() instead of strcpy().

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