Floor Vs Round

It is a common situation that you want less accuracy than php gives you in which case you need to use one of php s selection of rounding functions.

Floor vs round.

Significance is the multiple to which you want to round. Rounddown 2 5 2 floor 2 5 2 rounddown 2 5 2. So floor 1 2 1 and floor 1 9 1. In mathematics and computer science the floor function is the function that takes as input a real number and gives as output the greatest integer less than or equal to denoted or similarly the ceiling function maps to the least integer greater than or equal to denoted or.

Meanwhile round will round number that has decimal value lower than 0 5 to lower int and when more than 0 5 to higher int. Oddly round x 0 1 returns almost the same value as floor. Floor works like the mround function but floor always rounds down. When you feed math round a 500000 value it will round to the nearest even integer if i recall correctly.

Floor will always round down. But while round returns the same scale where possible as the data type passed in the data type floor returns has a 0 scale where possible. To truncate decimal places use the trunc function. Ceil floor and round.

It will return 23 75. For example if you want to avoid using pennies in your prices and your product is priced at 23 78 use the formula floor 23 78 0 05 to round prices up to the nearest nickel. Floor number significance number is the value you want to round. Floor the floor function functionality is to just give the number of digits which we had give after the decimal.

Both ceil and floor take just one parameter the number to round ceil takes the number and rounds it to the nearest integer above its current value whereas floor rounds it to the nearest integer below its. Floor will simply drop decimal value and return only integer. Floor returns the integer value less than or equal to the value passed in. In essence it is floor number number modulus 1.

Also round has more options like precision and rounding options. Very similar to round x 0 1. To round down and return an integer only use the int function. So round 1 2 1 but round 1 9 2.

If a number is already an exact multiple of significance no rounding occurs. For example and while. For eg floor 2 88888 001 2 888 this function will not give the round of values only provide same digits rounddown this function is also to give the number fo digits after the decimal without any change in the value. Rounddown however will round towards zero and roundup will round away from zero.