ceil vs floor vs round

float.md

The Math.ceil() function returns the smallest integer greater than or equal to a given number. Math.ceil(.95); // 1 Math.ceil(4); // 4 Math.ceil(7.004); // 8

The Math.floor() function returns the largest integer less than or equal to a given number. Math.floor( 45.95); // 45 Math.floor(-45.95); // -46

The Math.round() function returns the value of a number rounded to the nearest integer. // Returns the value 20 x = Math.round(20.49);

// Returns the value 21 x = Math.round(20.5);

// Returns the value -20 x = Math.round(-20.5);

// Returns the value -21 x = Math.round(-20.51);

// Returns the value 1 (!) // Note the rounding error because of inaccurate floating point arithmetics // Compare this with Math.round10(1.005, -2) from the example below x = Math.round(1.005*100)/100;

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