当将字符串作为布尔值使用时，将首先把字符串转换为整数，然后再计算真(非0)或假(0)。

When a string is used as a Boolean, it is first converted to an integer, and then evaluated for truth (non-zero) or falsehood (zero).

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h 是 atoi() 函数（将 ASCII 码转换为整数）所需要的，该函数将字符串转换为整数。

stdlib.h is needed for the atoi() function (ASCII to integer), which converts a string to an integer.

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在此示例中，第一个单元测试将数据库中的值转换为字符串，第二个单元测试将这些值转换为整数。

In this example, the first unit test converted the values from the database into strings and the second unit test converted them to integers.

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