| double | fabs | (double x) | Absolutwert |
| double | copysign | (double x, double y) | fabs(x) und sgn(y) |
| double | nan | (const char * tagp) | Nicht darstellbare Zahl |
| Vergleich |
|---|
| double | fdim | (double x, double y) | Positive Differenz |
| double | fmin | (double x, double y) | Kleinerer Wert |
| double | fmax | (double x, double y) | Größerer Wert |
| Division |
|---|
| double | fmod | (double x, double y) | Divisionsrest: x % y |
| double | fma | (double x, double y, double z) | Schnelle Variante: x*y+z |
| double | modf | (double x, double * i) | Nachkommastellen trennen |
| double | remainder | (double x, double y) | Divisionsrest |
| double | remquo | (double x, double y, int * quo) | …mit zusätzlichen Bits |
| Wurzelziehen |
|---|
| double | sqrt | (double x) | Quadratwurzel |
| double | cbrt | (double x) | Kubikwurzel |
| Trigonometrie |
|---|
| double | [a]sin[h] | (double x) | (Arcus) Sinus (hyperbolicus) |
| double | [a]cos[h] | (double x) | (Arcus) Cosinus (hyperbolicus) |
| double | [a]tan[h] | (double x) | (Arcus) Tangens (hyperbolicus) |
| double | atan2 | (double y, double x) | Arcus Tangens für 2 Variablen |
| double | hypot | (double x, double y) | Hypothenuse: sqrt(x²+y²) |
| Exponent |
|---|
| double | pow | (double x, double n) | Potenz: xn |
| double | exp | (double x) | Natürlichen Exponent: ex |
| double | exp2 | (double x) | Zweierpotenz: 2x |
| double | expm1 | (double x) | Zweierpotenz Minus Eins: 2x-1 |
| double | ldexp | (double x, int exp) | |
| double | frexp | (double x, int * exp) | |
| double | scalbln | (double x, long int n) | x * 2n |
| Logarithmus |
|---|
| double | log | (double x) | Natürlicher Logarithmus: ln(x) |
| double | log10 | (double x) | Dezimaler Logarithmus: log10(x) |
| double | log2 | (double x) | Binärer Logarithmus: log2(x) |
| double | logb | (double x) | Exponent einer Gleitpunktzahl |
| double | log1p | (double x) | Logartihmus plus Eins: log(x + 1) |
| int | ilogb | (double x) | |
| Rundung |
|---|
| double | floor | (double x) | Nächstgrößere Ganzzahl |
| double | ceil | (double x) | Nächstkleinere Ganzzahl |
| double | trunc | (double x) | Dezimalstellen Abschneiden |
| double | round | (double x) | Rundung |
| double | rint | (double x) | |
| long | lround | (double x) | |
| long | lrint | (double x) | |
| long long | llround | (long double x) | |
| long long | llrint | (long double x) | |
| double | nearbyint | (double x) | |
| double | nextafter | (double x, double y) | Nächste darstellbare Zahl in [x, y] |
| double | nexttoward | (double x, long double y) | |
| Besondere-Funktionen |
|---|
| double | erf | (double x) | Fehlerfunktion: 2/√π·∫0…x e(-t·t) dt |
| double | erfc | (double x) | Komplementäre Fehlerfunktion |
| double | tgamma | (double x) | Gammafunktion: ∫0…∞ t(x-1) e-t dt |
| double | lgamma | (double x) | log(fabs(tgamma(x))) |
| extern int | signgam | | Vorzeichen der Gammafunktion |
| double | j0 | (double x) | Bessel-Funktionen erster Art |
| double | j1 | (double x) | |
| double | jn | (int n, double x) | |
| double | y0 | (double x) | Bessel-Funktionen zweiter Art |
| double | y1 | (double x) | |
| double | yn | (int n, double x) | |
| Klassifikations-Makros |
|---|
| int |
fpclassify | (double x) | Klassifikation |
| int | signbit | (double x) | Vorzeichenbit gesetzt |
| int | isnan | (double x) | Keine darstellbare Zahl |
| int | isinf | (double x) | Unendlich große Zahl |
| int | isnormal | (double x) | Keine besondere Zahl |
| int | isfinite | (double x) | Endliche Zahl |
| int | isgreater | (double x, double y) | x größer als y |
| int | isgreaterequal | (double x, double y) | x größer oder gleich y |
| int | isless | (double x, double y) | x kleiner als y |
| int | islessequal | (double x, double y) | x kleiner oder gleich y |
| int | islessgreater | (double x, double y) | x ungleich y |
| int | isunordered | (double x, double y) | x oder y nicht darstellbar |