1·Addition of two signed ints results in a signed int.
两个有符号整数相加的结果是一个有符号的整数。
2·In cases where the string cannot be converted to an integer, a user-specified default int is placed in the target field.
对于不能将字符串转换为整数的情况，将在目标字段中使用一个用户指定的默认整数。
3·Ensure that an unsigned int is used where appropriate to prevent sign extension.
确保使用无符号整数来防止符号扩展的问题。
4·Perhaps there is some sense to this, but it strikes me as peculiar that the union of the two sets contains the float 4.0, while their intersection contains the int 4.
或许这有某种意义，但奇怪的是，这两个集的合集包含浮点数4.0，而其交集包含整数4。
5·So for now assume it's got to be an int or a char.
所以现在假使它是一个整数或字符。