Rule Definition
Variadic functions are functions that accept a variable number of arguments, such as 'printf()' and 'format()'. They are declared with an ellipsis ('...'): Ex: int printf ( const char * format, ... ); These functions can be only used with scalar data types C-style structs. Using them with other data types will lead to unexpected behavior.

Remediation
Review the parameters used to call these functions and try to replace them with native types. One alternative is to use non variadic functions that can allow for more data types.

Violation Code Sample

void showError(std::string const &errorMsg)
{
    printf("Error: %s", errorMsg);
}

Fixed Code Sample

You can correct this code by accessing a 0-terminated 'char*' from the string:

void showError(std::string const &errorMsg)
{
    printf("Error: %s", errorMsg.c_str());
} 

Or by using another display function:

void showError(std::string const &errorMsg)
{
    cout << "Error: " << errorMsg;
}