C Math Functions

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Following is a list of some useful C library functions.

The Absolute Value Functions
abs(some integer)
labs(some long int)

int x = abs(-5);
long int y = abs(-5);


Some other Math Functions
(found in math.h)

double exp(double x);
exponential of x

double log(double x);
natural logarithm of x

double log10(double x);
base-10 logarithm of x

double pow(double x, double y);
x raised to power y

double sqrt(double x);
square root of x

double ceil(double x);
smallest integer not less than x

double floor(double x);
largest integer not greater than x

double sin(double x);
sine of x

double cos(double x);
cosine of x

double tan(double x);
tangent of x

double fabs(double x);
absolute value of x



// found in stdlib.h

int abs(int n);
absolute value of n

long labs(long n);
absolute value of n

int rand(void);
Returns pseudo-random number in range 0 to RAND_MAX.

void srand(unsigned int seed);
Uses seed as seed for new sequence of pseudo-random numbers. Initial seed is 1.

RAND_MAX
Maximum value returned by rand().