在c ++中修复static_cast <int>()的精度

float f = 3.14f;
int i = static_cast<int>(round(f));

float f = 3.14f;
int i = static_cast<int>(std::floor(f));
int j = static_cast<int>(std::ceil(f));

float f = 3.14f;
int i = static_cast<int>(std::trunc(f));

float f = 3.14f;
long l = std::lround(f);
long long ll = std::llround(f);