Suppose i have a contract with decimals and total Supply as follow. How can i check if tokenAmountInWei pass in is integer value in form of ether.

decimals = 18
totalSupply = 1000000

function someFunction(uint tokenAmountInWei) {
    // check if tokenAmountInWei convert to ether is integer value
up vote 6 down vote accepted

This should work:

pragma solidity ^0.4.24;

contract Test {

    function checkIntegerETH(uint a) public pure returns (bool) {
        return (a % 1 ether == 0);

Here we are basically confirming that a has no remainder when being divided by 1018 (1 ether).

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