表达式pow(2.8,sqrt((double)x))的值的数据类型为???

[horson]

另外POW是干嘛的？？

[晨星]

类型就是pow函数的返回什类型。
pow是一个库函数，声明在<math.h>中，求次方的。返回值是double型。

[飞哥]

pow
Calculates x raised to the power of y.

double pow( double x, double y );

Routine Required Header Compatibility
pow <math.h> ANSI, Win 95, Win NT


For additional compatibility information, see Compatibility in the Introduction.

Libraries

LIBC.LIB Single thread static library, retail version
LIBCMT.LIB Multithread static library, retail version
MSVCRT.LIB Import library for MSVCRT.DLL, retail version


Return Value

pow returns the value of xy. No error message is printed on overflow or underflow.

Values of x and y Return Value of pow
x < > 0 and y = 0.0 1
x = 0.0 and y = 0.0 1
x = 0.0 and y < 0 INF


Parameters

x

Base

y

Exponent

Remarks

The pow function computes x raised to the power of y.

pow does not recognize integral floating-point values greater than 264, such as 1.0E100.

Example

/* POW.C
*
*/

#include <math.h>
#include <stdio.h>

void main( void )
{
double x = 2.0, y = 3.0, z;

z = pow( x, y );
printf( "%.1f to the power of %.1f is %.1f\n", x, y, z );
}


Output

2.0 to the power of 3.0 is 8.0


Floating-Point Support Routines

[Jokar]

偶也刚看过 msdn:)