ios中常用math函数

一、取整

// 向上取整
float ceilf(float);
double ceil(double);
long double ceill(long double);
// 向下取整
float floorf(float);
double floor(double);
long double floorl(long double);
// 四舍五入取整
float roundf(float);
double round(double);
long double roundl(long double);

long int lroundf(float);
long int lround(double);
long int lroundl(long double);

float nearbyintf(float);
double nearbyint(double);
long double nearbyintl(long double);

float rintf(float);
double rint(double);
long double rintl(long double);

long int lrintf(float);
long int lrint(double);
long int lrintl(long double);
// 取浮点数的整数部分
float truncf(float);
double trunc(double);
long double truncl(long double);

二、取绝对值

// 浮点类型取绝对值
float fabsf(float);
double fabs(double);
long double fabsl(long double);
// 整数类型取绝对值
int abs(int);
long labs(long);
long long llabs(long long);

三、取余

float fmodf(float, float);
double fmod(double, double);
long double fmodl(long double, long double);

float remainderf(float, float);
double remainder(double, double);
long double remainderl(long double, long double);

float remquof(float, float, int *);
double remquo(double, double, int *);
long double remquol(long double, long double, int *);

四、求最大值和最小值

// 求最大值
float fmaxf(float, float);
double fmax(double, double);
long double fmaxl(long double, long double);
// 求最小值
float fminf(float, float);
double fmin(double, double);
long double fminl(long double, long double);

五、示例

Paste_Image.png