Function Name

Description

Syntax

Returning Value

abs

Returns the absolute value of an integer.

#include <math.h>

int  abs (int x);

abs returns an integer in the range of 0 to 32767, with the exception of -32768 returned as -32768

clrscr

Clears the text window.

#include <constrea.h>

void clrscr (void);

clrscr clears the current text window and places the cursor in the upper left-hand corner (position 1,1).

fabs

Returns the absolute value of a double float.

#include <math.h>

double fabs (double x);

pow

Calculates x to the power y.

#include <math.h>

double pow (double x, double y);

On success, pow returns the value calculated, x^y.

random

Random number generator.

#include <stdlib.h>

int  random (int num);

random returns a random number between 0 and (num-1).  Both num and the random number returned are integers.

randomize

Initializes random number generator.

#include <time.h>

#include <stdlib.h>

void randomize (void);

randomize initializes the random number generator with a random value.  Because randomize calls the time function, you must also include <time.h>.

sqrt

Calculates the positive square root of the input value.

#include <math.h>

double sqrt (double x);

sin

Returns the sin (x), x in radians

#include <math.h>

double sin (double x);

cos

Returns the cos (x), x in radians

#include <math.h>

double cos (double x);

tan

Returns the tan (x), x in radians

#include <math.h>

double tan (double x);

asin

Returns inverse sin (x), returned value in radians

#include <math.h>

double asin (double x);

acos

Returns inverse cos (x), returned value in radians

#include <math.h>

double acos (double x);

atan

Returns inverse tan (x), returned value in radians

#include <math.h>

double atan (double x);

exp

Returns answer of e^x

#include <math.h>

double exp(double x);

log

Returns natural log of x

#include <math.h>

double log (double x);

log10

Returns base-10 log of x

#include <math.h>

double log10 (double x);