若有下列类型说明语句:
char w;int x;float y;double z;
则表达式w*x+z-y的结果的数据类型是()
A.char
B.int
C.float
D.double
A.4
B.5
C.6
D.不确定
A.X(double k){ i=k; }
B. X(double m, double n){ i=m;j=n; }
C.X0{ i=6; }
D. double X(doublek){ i=k; return i; }
A.X(double、k){、i=k;、}
B.X(double、m,、double、n){、i=m;j=n;、}
C.XO){、i=6;、}
D.doubleX(double、k){、i=k;、return、i;、}
指出下列命题是否正确,若有错误,错误何在?
(1)极限存在,则函数y=(x)在点x0处可导;
(2)函数y=f(x)在点处的导数等于[f(x0)]';
(3)函数y=f(x)在点x0处连续,则f(x)在点x0处可导;
(4)函数y=f(x)在点处可导,则f(x)在点x0处可导;
(5)函数y=|f(x)|在点x0处可导,则f(x)在点x0处可导;
(6)初等函数在其定义区间内必可导.
A.doubleX(doublek){i=k;returni;}
B.X(){i=6;j=8;}
C.X(doublem,doublen){i=m;j=n;}
D.X(doublek){i=k;}