下列函数中对调用它的函数没有起到任何作用的是( )。A.void f1(double x){--x;}B.double f2(double x){return x-1.5;}C.void f3(double x){--x;}D.double f4(double*x){--*x;return*x;}
下列函数中对调用它的函数没有起到任何作用的是( )。
A.void f1(double &x){--x;}
B.double f2(double x){return x-1.5;}
C.void f3(double x){--x;}
D.double f4(double*x){--*x;return*x;}
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