Insérer la valeur d'une variable dans une chaine de caractère

<sstream> est il inclu dans <iostream> ?

ah si i est un string je sais que ca marche comme ca mais pour un int alors je sais pas en C++

essaye : MaChaine.insert(MaChaine.length , i);
ou sinon MaChaine += i;

sinon le truc du flux a l'air de marcher :)

ostringstream oss;

string chaine = "MaChaine";
int i = !;

oss << MaChaine << i;
MaChaine = oss.str();

cout << MaChaine;

size_t find ( const string& str, size_t pos = 0 ) const;
size_t find ( const char* s, size_t pos, size_t n ) const;
size_t find ( const char* s, size_t pos = 0 ) const;
size_t find ( char c, size_t pos = 0 ) const;

str

string to be searched for in the object. The entire content of str must be matched in some part of the string to be considered a match.

s

Array with a sequence of characters.
In the second member function version, the size of the content to be matched is only determined by parameter n.
In the third version, a null-terminated sequence is expected, and its end is determined by the first occurrence of a null character in it.

n

Length of sequence of characters to search for.

c

Individual character to be searched for.

pos

Position of the first character in the string to be taken into consideration for possible matches. A value of 0 means that the entire string is considered.

Return Value

// different member versions of find in the same order as above:
  found=str.find(str2);
if (found!=string::npos)
    cout << "first 'needle' found at: " << int(found) << endl;