C# 0 The Complete Reference

double

 (2.2) to 

int

, which is the type 

of

nums

 in 

MinVal( )

.

When using 

params

, you need to be careful about boundary conditions because a 

params

 parameter can accept any number of arguments—

even zero!

 For example, it is 

syntactically valid to call 

MinVal( )

 as shown here:

min = ob.MinVal(); // no arguments

min  = ob.MinVal(3); // 1 argument

This is why there is a check in 

MinVal( )

 to confirm that at least one element is in the 

nums

array before there is an attempt to access that element. If the check were not there, then a 

runtime exception would result if 

MinVal( )

 were called with no arguments. (Exceptions are 

described in Chapter 13.) Furthermore, the code in 

MinVal( )

 was written in such a way as to 

permit calling 

MinVal( )

 with one argument. In that situation, the lone argument is returned.

A method can have normal parameters and a variable-length parameter. For example, 

in the following program, the method