Some common C + + standard functions

Some common C + + standard functions

Double atof (const char* p);
int atoi (const char* p);
Long Atol (const char* p); Cstdlib converts the string p to the number represented by a Val-like

Double fabs (double); Cmath absolute value function similar to ABS

Double ceil (double); Cmath rounding function, rounding up
Double floor (double); Cmath rounding function, rounding down
Double sqrt (double); Cmath square root function
Double pow (double D, double e); Cmath power function, returns the E-time of D

Double sin (double)                       &N    　　Bsp;// cmath trigonometric  
Double cos (double);
Double tan (double);  
Double asin (double)                    　　     // cmath Inverse trigonometric function  
Double ACOs (double);
Double Atan (double);  
Double atan2 (double y, double x);      //Cmath enhanced inverse tangent function, which is useful for the spoke angle of the return point (x, y), will root The quadrant in which the stronghold is located adjusts the Radian value
Double sinh (double);                        　　 // cmath hyperbolic function  
Double cosh (double);
Double Tanh (double);  

Double exp (double); Cmath exponential function with E as the base
Double log (double); Cmath logarithm function, with e as the base
Double log10 (double); Cmath logarithm function, base 10

In addition, the standard C + + does not provide a function pi, to obtain the value of pi generally do this:
Const double PI = acos (0.) * 2;

From http://bbs.tianya.cn/post-itinfo-181747-1.shtml

Some common C + + standard functions