round double to n decimal places c 2b 2b

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Alex
24 Mar 2019
1float roundoff(float value, unsigned char prec)
2{
3  float pow_10 = pow(10.0f, (float)prec);
4  return round(value * pow_10) / pow_10;
5}
6
7auto rounded = roundoff(100.123456, 3);
8// rounded = 100.123;
Perrine
21 Apr 2020
1value = round( value * 100.0 ) / 100.0; // 2 decimal places
2value = round( value * 1000.0 ) / 1000.0; // 3 decimal places
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