How do you round off float values in Ballerina?

问题

In BallerinaLang, how do you round off float values to a specified number of decimal places?

回答1:

Ballerina has not provided specific method yet for float round off. But using math:round of existing math package, following can be done.

import ballerina/math;

function roundFloat(float value, int decimalPlaces) returns float {
    float factor = math:pow(10, decimalPlaces);
    return  <float> math:round(value * factor)/factor;
}

function main(string... args) {
        float result = roundFloat(12.84675, 2);
}

PS: math:round function only rounds a floating point number to the nearest int

来源：https://stackoverflow.com/questions/51211525/how-do-you-round-off-float-values-in-ballerina