Fixing data that contains numeric overflow - excel

Question

I have been given a dataset that I have identified contains records with a numeric overflow eg -214012688. Is there a way for me to fix this?
Here's a sample of data I have
2142936357
2143000225
2142936544
2142974737
2142935734
2143051458
-2143303677
-2142887448
2142866111
2142864212
2143020049
2143009445
2143300604
2143121125
-2142802104
2142801451
The dataset is not sorted so the numbers aren't in order. when I asked my client why there's negative numbers its because it went over the max integer amount.

Answer 1

If any of your values have become positive after rolling over, there is no way to fix it, but if that's not the case, you can write a custom function to get the absolute value of the difference between each negative value and the signed minimum, then add that to the signed maximum. Here is a JavaScript function for it:
function signedRolloverToUnsigned (x, signedMin, signedMax) {
if (x < 0) {
x = Math.abs((signedMin - 1) - x) + signedMax;
}
return x;
}
And here is the custom Google sheet function you'd need if you just want to copy + paste and use it in your document:
/**
* Converts signed rollover (negative) values to their equivalent unsigned positive values
*
* #param {number} value The value to convert.
* #return The unsigned representation of the input value.
* #customfunction
*/
function signedRolloverToUnsigned (value) {
if (value < 0) {
value = Math.abs((-2147483648 - 1) - value) + 2147483647;
}
return value;
}
Here is a working example using the data you provided:
'use strict';
function signedRolloverToUnsigned (x, signedMin, signedMax) {
if (x < 0) {
x = Math.abs((signedMin - 1) - x) + signedMax;
}
return x;
}
const text = `2142936357
2143000225
2142936544
2142974737
2142935734
2143051458
-2143303677
-2142887448
2142866111
2142864212
2143020049
2143009445
2143300604
2143121125
-2142802104
2142801451`;
const arrSource = text.split('\n').map((x) => {
return parseInt(x);
});
const signedRange = [-2147483648, 2147483647];
const arrFixed = arrSource.map((x) => signedRolloverToUnsigned(x, signedRange[0], signedRange[1]));
//---Ignore: For displaying output --->
document.body.style = 'background-color: #eeeeee; padding: 1rem;';
const pre = document.body.appendChild(document.createElement('pre'));
const samp = pre.appendChild(document.createElement('samp'));
samp.textContent = arrFixed.join('\n');
const styles = {
'box-sizing': 'border-box',
'background-color': 'white',
'border-radius': '0.5rem',
'display': 'block',
'padding': '1rem',
};
for (const [prop, value] of Object.entries(styles)) {
samp.style.setProperty(prop, value);
}