What are the parameters of the atoi function in C++?

In C++, the atoi function is used to convert a string to an integer. Its declaration is as follows:

int atoi(const char* str);

The atoi function takes a parameter str, which is a pointer to a null-terminated string. The function will attempt to convert this string into the corresponding integer.

Here is the parameter description of the atoi function:

1. String: A string that needs to be converted to an integer. This string must be terminated by a null character and can only contain numerical characters (‘0’ to ‘9’) and optional positive or negative sign (‘+’ or ‘-‘). If the string contains illegal characters or is not in the correct format, the conversion operation may result in undefined behavior.

Please be aware that in C++, there are safer and more powerful alternative functions for converting strings to integers, such as std::stoi or std::stringstream. They offer better error handling and exception safety. Therefore, in practical development, it is recommended to use more modern methods for converting strings to integers.