How to convert a char array to a string

Question

Converting a C   string to a char array is pretty straightorward using the c str function of string and then doing strcpy  However  how to do the opposite   I have a char array like  char arr       This is a test   to be converted back to  string str    This is a test

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Another solution might look like this   char arr      mom   std  cout  lt  lt   hi    lt  lt  std  string arr     which avoids using an extra variable

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include  lt stdio h gt   include  lt iostream gt   include  lt stdlib h gt   include  lt string gt   using namespace std   int main        char  tmp    char   malloc 128     int n sprintf tmp   Hello from Chile        string tmp str   tmp      cout  lt  lt   tmp  lt  lt      is a char array beginning with    lt  lt n  lt  lt   chars long n   lt  lt  endl    cout  lt  lt  tmp str  lt  lt      is a string with    lt  lt n  lt  lt   chars long n   lt  lt  endl    free tmp     return 0      OUT   H   is a char array beginning with 17 chars long  Hello from Chile   is a string with 17 chars long

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The string class has a constructor that takes a NULL-terminated C-string   char arr       This is a test    string str arr         You can also assign directly to a string  str    This is another string       or str   arr

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There is a small problem missed in top-voted answers  Namely  character array may contain 0  If we will use constructor with single parameter as pointed above we will lose some data  The possible solution is   cout  lt  lt  string  123 0 123    lt  lt  endl  cout  lt  lt  string  123 0 123   8   lt  lt  endl    Output is      123   123 123

[c++] How to convert a char array to a string?

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