C++ ƽ·½¡¢¿ª·½¡¢È¡ÕûÔËËã

#include <math.h>

//ƽ·½ pow()
int a = pow(4,2);// 4µÄƽ·½=16

//¿ª·½
int b = pow(9,0.5); // 9µÄƽ·½¸ùµÈÓÚ3
int c = sqrt(9);    // 9µÄƽ·½¸ùµÈÓÚ3

//ÕûÊý¾ø¶ÔÖµ
int c = abs(b-c);

//¸¡µãÊý¾ø¶ÔÖµ
double d = fabs(b-c);