The rand routine returns a number between 0 and RAND_MAX, as defined in the stdlib.h header.

rand例程返回一个介于0和stdlib . h中定义的rand _ max之间的数字。

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

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。

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

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。

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