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invalid conversion from 'char' to 'const char*'(using strings)

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How can I send a single character from one string into a function parameter of type string to be equal to another string.
For example:

/// The function (thisString is of type string)
void setChar(string c)
thisString = c;

/// Calling the function
string alphabet = "abcdefg";

When I do this, i get the error Invalid conversion from 'char' to 'const char*'. Also, no I cannot change the types in the function to char.

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You can also do:

setChar(std::string(1, alphabet[0])); // creates a string of length 1 consisting of alphabet[0] repeated 1 time
setChar(std::string(alphabet, 0, 1)); // creates a string of length 1 from string alphabet starting from the index 0

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