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long int strtol (const char* str, char** endptr, int base);

float stof (const string&  str, size_t* idx = 0);
float stof (const wstring& str, size_t* idx = 0);

double stod (const string&  str, size_t* idx = 0);
double stod (const wstring& str, size_t* idx = 0);

double strtod (const char* str, char** endptr);

Convert string to double
Parses the C-string str interpreting its content as a floating point number (according to the current locale) and returns its value as a double. If endptr is not a null pointer, the function also sets the value of endptr to point to the first character after the number.

The function first discards as many whitespace characters (as in isspace) as necessary until the first non-whitespace character is found. Then, starting from this character, takes as many characters as possible that are valid following a syntax resembling that of floating point literals (see below), and interprets them as a numerical value. A pointer to the rest of the string after the last valid character is stored in the object pointed by endptr.

   #include <string.h>

   char *strsep(char **stringp, const char *delim);

Now, you have two choices. This first, that is the worst one, but it's
useful if you are linking to a big chunk of c-code that was not made by
you, is to copy the content of the string object in a char* and to pass
that to strtok. The second one, that is the best one, is not to use
strtok: you can obtain the functionality of strtok by the string methods
"find_first_of" and "find_first_not_of".

Another alternative (maybe only for simple cases) is to create an
istringstream from the string, and use std::getline(), specifying the
delimiter character:

You should be using single quotes for characters. Double quotes means you're using a (potentially single-character) string literal, which is represented as a const char * (pointer to constant character).

Correct syntax: circle1.symbol = '*';

NAME
strdup, strndup, strdupa, strndupa - duplicate a string
SYNOPSIS

#include <string.h>

char *strdup(const char *s);

char *strndup(const char *s, size_t n);

char *strdupa(const char *s);

char *strndupa(const char *s, size_t n);

3. Convert string -> char *
   #include
   #include

int main()
{
const char* charString= "Eggs on toast.";
std::string someString(charString);

std::cout << someString;
return 0;
}

char *cStr = "C++";
std::string Str = std::string(cStr);