std::string str = "My name is "; str.append("John. "); str.AppendFormat("I am %d years old.", 25);
StdStrBuf buf; buf.AppendFormat("The sum of %d and %d is %d.", 3, 5, 8); std::cout << buf.getCStr();In this example, an empty StdStrBuf object is created. The AppendFormat method is then used to append the string with "The sum of 3 and 5 is 8.", where the numbers are inserted using the %d format specifier. Finally, the getCStr method is used to get a char array of the string, which is then printed to the console. Overall, the StdStrBuf class with the AppendFormat method is useful for dynamically formatting and managing strings in C++, and it is part of the STL package.