iOS 向下取整、向上取整、四舍五入

iOS 向下取整、向上取整、四舍五入

向上取整：float ceilf(float);    double ceil(double);

向下取整：float floorf(float);   double floor(double);

四舍五入：float roundf(float);  double round(double);

CGFloat a = 3.3;

    CGFloat ceilA = ceilf(a);

    CGFloat floorA = floorf(a);

    CGFloat roundA = roundf(a);

    NSLog(@"%lf 向上取整为%lf, 向下取整为%lf, 四舍五入为%lf", a, ceilA, floorA, roundA);

    double b = 5.8;

    double ceilB = ceil(b);

    double floorB = floor(b);

    double roundB = round(b);

    NSLog(@"%lf 向上取整为%lf, 向下取整为%lf, 四舍五入为%lf", b, ceilB, floorB, roundB);

    CGFloat c = -3.3;

    CGFloat ceilC = ceilf(c);

    CGFloat floorC = floorf(c);

    CGFloat roundC = roundf(c);

    NSLog(@"%lf 向上取整为%lf, 向下取整为%lf, 四舍五入为%lf", c, ceilC, floorC, roundC);

    double d = -5.8;

    double ceilD = ceil(d);

    double floorD = floor(d);

    double roundD = round(d);

    NSLog(@"%lf 向上取整为%lf, 向下取整为%lf, 四舍五入为%lf", d, ceilD, floorD, roundD);

// 打印结果

2017-03-02 10:03:47.570 UsingWebView[88462:10650303] 3.300000 向上取整为4.000000, 向下取整为3.000000, 四舍五入为3.000000

2017-03-02 10:03:47.572 UsingWebView[88462:10650303] 5.800000 向上取整为6.000000, 向下取整为5.000000, 四舍五入为6.000000

2017-03-02 10:03:47.573 UsingWebView[88462:10650303] -3.300000 向上取整为-3.000000, 向下取整为-4.000000, 四舍五入为-3.000000

2017-03-02 10:03:47.573 UsingWebView[88462:10650303] -5.800000 向上取整为-5.000000, 向下取整为-6.000000, 四舍五入为-6.000000

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