IOS 四捨五入 進一法 去尾法

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float numberToRound;

   int result;

 

    numberToRound = 4.51;

    result = (int)roundf(numberToRound);

    NSLog(@"roundf(%f) = %d", numberToRound, result); // roundf(4.510000) = 5

    result = (int)ceilf(numberToRound);

    NSLog(@"ceilf(%f) = %d", numberToRound, result);// ceilf(4.510000) = 5

    result = (int)floorf(numberToRound);

    NSLog(@"floorf(%f) = %d", numberToRound, result);// floorf(4.510000) = 4

    numberToRound = 10.49;

    result = (int)roundf(numberToRound);

    NSLog(@"roundf(%f) = %d", numberToRound, result);// roundf(10.490000) = 10

    result = (int)ceilf(numberToRound);

    NSLog(@"ceilf(%f) = %d", numberToRound, result);// ceilf(10.490000) = 11

    result = (int)floorf(numberToRound);

    NSLog(@"floorf(%f) = %d", numberToRound, result);// floorf(10.490000) = 10

    numberToRound = -2.49;

    result = (int)roundf(numberToRound);

    NSLog(@"roundf(%f) = %d", numberToRound, result);// roundf(-2.490000) = -2

    result = (int)ceilf(numberToRound);

    NSLog(@"ceilf(%f) = %d", numberToRound, result);// ceilf(-2.490000) = -2

    result = (int)floorf(numberToRound);

    NSLog(@"floorf(%f) = %d", numberToRound, result);// floorf(-2.490000) = -3

    numberToRound = -3.51;

    result = (int)roundf(numberToRound);

    NSLog(@"roundf(%f) = %d", numberToRound, result);// roundf(-3.510000) = -4

    result = (int)ceilf(numberToRound);

    NSLog(@"ceilf(%f) = %d", numberToRound, result);// ceilf(-3.510000) = -3

    result = (int)floorf(numberToRound);

    NSLog(@"floorf(%f) = %d", numberToRound, result);// floorf(-3.510000) = -4

IOS 四捨五入 進一法 去尾法