iphone - 如何在 xcode for iOS4 for iphone 中将 float 舍入为整数？

Question

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Answer 1

由于 int 不能存储 float ，因此 float 的小数部分将被截断，您将得到整数:

float x = 3.14159;
int y = (int)x;

这是可行的，因为 int 只能存储整数，所以它只存储 x 的整数部分

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另见 gnu C Library Rounding Functions :

 — Function: double ceil (double x)
 — Function: float ceilf (float x)
 — Function: long double ceill (long double x)
 — Function: double floor (double x)
 — Function: float floorf (float x)
 — Function: long double floorl (long double x)
 — Function: double trunc (double x)
 — Function: float truncf (float x)
 — Function: long double truncl (long double x)
 — Function: double rint (double x)
 — Function: float rintf (float x)
 — Function: long double rintl (long double x)
 — Function: double nearbyint (double x)
 — Function: float nearbyintf (float x)
 — Function: long double nearbyintl (long double x)
 — Function: double round (double x)
 — Function: float roundf (float x)
 — Function: long double roundl (long double x)
 — Function: long int lrint (double x)
 — Function: long int lrintf (float x)
 — Function: long int lrintl (long double x)
 — Function: long long int llrint (double x)
 — Function: long long int llrintf (float x)
 — Function: long long int llrintl (long double x)
 — Function: long int lround (double x)
 — Function: long int lroundf (float x)
 — Function: long int lroundl (long double x)
 — Function: long long int llround (double x)
 — Function: long long int llroundf (float x)
 — Function: long long int llroundl (long double x)
 — Function: double modf (double value, double *integer-part)
 — Function: float modff (float value, float *integer-part)
 — Function: long double modfl (long double value, long double *integer-part)