round double to 2 decimal places c++

float roundoff(float value, unsigned char prec)
{
  float pow_10 = pow(10.0f, (float)prec);
  return round(value * pow_10) / pow_10;
}

auto rounded = roundoff(100.123456, 3);
// rounded = 100.123;

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Awgiedawgie 440215 points

                                    double d = 0.12345;
std::cout.precision(2); // for accuracy to 2 decimal places 
std::cout &lt;&lt; d &lt;&lt; std::endl; // 0.12

Thank you! 9

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3.4

5

Phoenix Logan 186120 points

                                    value = round( value * 100.0 ) / 100.0; // 2 decimal places
value = round( value * 1000.0 ) / 1000.0; // 3 decimal places

Thank you! 5

3.4 (5 Votes)

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3.6

5

Awgiedawgie 440215 points

                                     float a,b,c,d,sum;

 cin&gt;&gt;a&gt;&gt;b&gt;&gt;c&gt;&gt;d; // reading decimal values

sum=(a*b*c*d);

sum=round(sum*100)/100; // here it is for 2 decimal points

if((float)sum &lt; (float) 9.58)
  cout&lt;&lt;&quot;YES\n&quot;;
else
  cout&lt;&lt;&quot;NO\n&quot;;

Thank you! 5

3.6 (5 Votes)

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