Calculating a total without the need to round it to the nearest two decimal points

Excuse my lack of expertise in this area. I recently asked a question about rounding off numbers to two decimal places. Now, how can I calculate the sum of these numbers but display only the two decimals without rounding them off? I am working with JavaScript.

For example: 12.876 + 36.278 = 49.154. I want the answer to be... 49.15 only. Or another example: 12.876 + 1 = 13.876. I need the answer to be... 13.87

Below is my current code (which rounds off to two decimal places)

function civ(){
civ1=Number(document.addition.scc.value);
civ2=Number(document.addition.ccc.value);
civ3=Number(document.addition.ncc.value);
civ4=Number(document.addition.vch.value);
civ5=Number(document.addition.mch.value);
civ6=Number(document.addition.nlch.value);
civ7=Number(document.addition.slch.value);
valNum1=Math.round((civ1+civ2+civ3+civ4+civ5+civ6+civ7)*10)/10;
document.addition.civ123.value=valNum1;
}

Gratitude to everyone who assists me regularly! :)

javascriptdecimal

Answer №1

Math.round(N * 100) / 100

This code will round off to the nearest hundredth place; Math.floor() ensures rounding down.

Answer №2

It is important to note that Math.floor(N * 100) / 100 does not always yield the expected result.

For instance,

When applying this formula, 4.56 may actually become 4.55.

Answer №4

An age-old inquiry, yet lacking a satisfactory response until now. As highlighted by @user3006769, some numbers fail to produce the desired outcome when applying Math.floor(N*100)/100.

An alternative method involves determining the number of digits preceding the decimal point, converting the number to a string, truncating any characters beyond the second decimal place, and reconverting it back to a number:

function roundDownDecimals(num, decimals) {
  const preDecimalDigits = Math.floor(num).toFixed(0).length;
  return parseFloat(num.toFixed(decimals + 1).slice(0, preDecimalDigits + decimals + 1));
}

roundDownDecimals(4.56, 2);
// results in 4.56

roundDownDecimals(13.876, 2);
// results in 13.87

roundDownDecimals(4.10, 2);
// results in 4.1

To maintain trailing zeroes, omit the parseFloat function.

function roundDownDecimals(num, decimals) {
  const preDecimalDigits = Math.floor(num).toFixed(0).length;
  return num.toFixed(decimals + 1).slice(0, preDecimalDigits + decimals + 1);
}

roundDownDecimals(4.10, 2);
// results in "4.10"

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