#include <cmath> double roundToTwoDecimalPlaces(double value) { return std::round(value * 100) / 100; } 上述代码中,roundToTwoDecimalPlaces函数利用round函数对浮点数进行四舍五入,并将结果保留两个小数位返回。 方法2: 使用sprintf函数 C语言中的sprintf函数可以将浮点数格式化为字符串,并可以指定保留的...
double num = 123.456789; double rounded = roundToTwoDecimalPlaces(num); printf("Result: %.2fn", rounded); return 0; } 4.3 详细解释 在上述代码中,我们定义了一个名为roundToTwoDecimalPlaces的函数,用于将浮点数保留两位小数。通过调用该函数,我们可以简化主函数中的代码,使其更具可读性。此外,这种方法...
double round_to_n_decimal_places(double number, int n) { double factor = pow(10, n); return ((int)(number * factor + 0.5)) / factor; } int main() { double number = 123.456789; double rounded = round_to_n_decimal_places(number, 2); printf("Custom rounded number to 2 decimal p...
If you want to round down any double to specific decimal places, if doesn´t matter if is the midpoint, you can use: public double RoundDownDouble(double number, int decimaPlaces) { var tmp = Math.Pow(10, decimaPlaces); return Math.Truncate(number * tmp) / tmp; } Share Improve t...
思路简述:int(float(val))。就是先把double类型的val数据强制转换为float给它丢失一下精度,然后再转int。这个实现思路只能保证float这么大的精度大小。 实现代码: c #include<stdio.h>introundToFloat(doublenum){return(int)(float)num; }intmain(){doublenum =9.9999999;floattemp = (float)num;intresult =...
double x; printf( "Please enter a positive number that has a fractional part with three or more decimal places\n" ); scanf( "%lf", &x ); printf( "The number you have entered is %5.2f\n", x + 0.005 ); I'm pretty sure printf only truncates. So you will need to add...
write a function that will round a floating-point number to an indicated decimal place.For example the number 17.457 would yield the value 17.46 when it is rounded off to two decimal places. 相关知识点: 试题来源: 解析 #include <stdio.h>#include <string.h>int main(){ double a = 0; ...
中将浮点数格式化为 2 位小数您可以使用以下代码将其格式化为 2 位小数 Obj C double hellodouble = 10.025; NSLog(@"Your value with 2 decimals: Objective-C: how to rounding double to 2 decimal bits if there are some value after decimal else the value should be rounded to 0 decimal places ...
sprintf到具有 "%.50f"格式字符串的大缓冲区，去除尾随零，然后计算小数点后面的字符。这将受到 printf...
SELECTid,CAST(FORMAT_NUMBER(amount,2)ASDOUBLE)ASrounded_amountFROMsales; 1. 2. 运行以上查询语句后,我们可以得到以下结果: 从结果可以看出,每笔销售额都保留了两位小数,但没有进行四舍五入。 总结 在Hive中,我们可以使用ROUND函数对数字进行舍入操作。默认情况下,ROUND函数会进行四舍五入。然而,如果我们需要...