concatenating integer to string

Hi guys!
I'm facing a problem that I would to concatenate integer to string, so I did:

Code:

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int count=5;
string tmp= "";
tmp+=count;

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it's wrong ! because the solution included also '0' in tmp+, mean:

Code:

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int count=5;
string tmp= "";
tmp+=count+ '0';

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what does + '0' mean in that case? why I'm using that sign?

any help please?

Oh... maybe adding a '0' to an integer is to add an '0' to an integer? Just maybe?

string isn't a data type. You want char* or char[n], which is an array of characters.

You can try sprintf to put the int into the character array.

Quote:

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Originally Posted by catacombs

string isn't a data type. You want char* or char[n], which is an array of characters.

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Nope... in STL there is a class called basic_string and an alias called string. They are in namespace std (you need to include string header)... Notice this question was posted in C++ Programming board (not C).

RyanC, to help you answer your own question, here's a test:

Code:

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$ g++ -xc++ -include iostream - <<EOF
int main() { int x = '0'; std::cout << x << std::endl; }
EOF
$ ./a.out
48

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Hope it helps.

Quote:

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Originally Posted by flp1969

Nope... in STL there is a class called basic_string and an alias called string. They are in namespace std (you need to include string header)... Notice this question was posted in C++ Programming board (not C).

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:facepalm:

Thanks. I didn't see the C++ tag.

Quote:

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Originally Posted by flp1969

RyanC, to help you answer your own question, here's a test:

Code:

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$ g++ -xc++ -include iostream - <<EOF
int main() { int x = '0'; std::cout << x << std::endl; }
EOF
$ ./a.out
48

---

Hope it helps.

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I understand that '0' is mapped to integer 48, but once again so 48+6=54 is an integer, and because I want it in char because I'm using "+" so my pc automatically mapping 54 as char which is '6'?!

I'm confused of how he decide to take integer 54 or char '6' ?


and if I understand you, if I write 6+48 instead of 6+'0' ..will I get on the output '6'?

American Standard Code for Information Interchange (ASCII)