"Go Language Program Design" 7th Chapter Practice

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7.1 Known triangular three sides A, B, c, write a function to find the Triangle Area Formula areas (), to find the triangular area.

7.2 Write function Find (), finds the largest element subscript max and the smallest element subscript min in an integer array of arr, requires the array as a function parameter, and returns the search results max and min using multiple return values.

7.3 Write a function that calculates the average of the elements of the float64 type slice, requiring that the slice be passed as a function parameter to the handler function.

7.4 Design a parameter function max (), which can find the maximum value in an indefinite number of integer arrays.

7.5 Write the function FAC (), using recursive calls to calculate the n!.

7.7 Use the panic-and-recover mechanism to write a program to detect the legality of user accounts, such as the user can not appear in the space, can not appear illegal characters, such as ', ', ' # ', '! ' such as