//向下取整
float downF1 = 1.2;
float downF2 = 1.6;
int downI1, downI2;
downI1 = floorf(downF1);
downI2 = floorf(downF2);
//向上取整
float upF1 = 2.2;
float upF2 = 2.6;
int upI1, upI2;
upI1 = ceil(upF1);
upI2 = ceil(upF2);
NSLog(@"---down:%d -- %d ***** up:%d -- %d", downI1, downI2, upI1, upI2);
output:
---down:1 -- 1 ***** up:3 -- 3
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