iOS 四舍五入、进位、摸位 方法

iOS开发中经常遇到 浮点数的 四舍五入、进位、摸位 方法。

1，四舍五入法

floatnumberToRound;intresult;    numberToRound =5.61;    result = (int)roundf(numberToRound);NSLog(@"roundf(%.2f) = %d", numberToRound, result);//输出 roundf(5.61) = 6numberToRound =5.41; result = (int)roundf(numberToRound);NSLog(@"roundf(%.2f) = %d", numberToRound, result);//输出 roundf(5.41) = 5

2、进位方法

floatnumberToRound;intresult;    numberToRound =5.61;    result = (int)ceilf(numberToRound);NSLog(@"ceilf(%.2f) = %d", numberToRound, result);//输出 ceilf(5.61) = 6numberToRound =5.41; result = (int)ceilf(numberToRound);NSLog(@"ceilf(%.2f) = %d", numberToRound, result);//输出 ceilf(5.41) = 6

3、摸位方法

floatnumberToRound;intresult;    numberToRound =5.61;    result = (int)floorf(numberToRound);NSLog(@"floorf(%.2f) = %d", numberToRound, result);//输出 floorf(5.61) = 5numberToRound =5.41; result = (int)floorf(numberToRound);NSLog(@"floorf(%.2f) = %d", numberToRound, result);//输出 floorf(5.41) = 5

作者：龙翱天际

链接：https://www.jianshu.com/p/19d263a7410f

來源：简书

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