Page 133 - Programming Microcontrollers in C

118 Chapter 2 Advanced C Topics

cosh(x) hyperbolic cosine of x
tanh(x) hyperbolic tangent of x
exp(x) exponential function of x
log(x) logarithm base e of x
log10(x) common logarithm of x
pow(x,y) raise x to the y power
sqrt(x) square root of x
fabs(x) absolute value of x
ceil(x) smallest integer not less than x
floor(x) largest integer not greater than x
ldexp(x,n) x*2^n
frexp(x,int *exp) split double into mantissa and exponent
modf(x,double *ip) Splits x into integral and fractional
parts. Puts integral in ip and returns
fractional part.
fmod(x,y) floating-point remainder of x/y
These functions all require double arguments and return double values.

Utility functions—in stdlib.h

double atof(const char *s);
integer atoi(const char *s);
long atol(const char *s);
double strtod(char *str,char **scanstop);
long strtol(char *str,char **scanstop,int base);
unsigned long strtoul(char *str,char **scanstop,int base);
ldiv_t ldiv(long numer,long denom);
div_t div(int numer,int denom);
long labs(long n);
int abs(int n);
void *bsearch(void *key, void *base,size_t number,size_t size,
int(*compare)(void*,void*));
void qsort(void *base,size_t number, size_t size,
int(*compare)(void*,void*));
int rand(void);
int srand(unsigned int seed);
void *calloc(size_t nobj, size_t size);
void *malloc(size_t size);
void *realloc(void *p, size_t size);