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The function caller() below does not return any value 

pragma solidity ^0.4.18;

contract M2M{

    function setvalues(uint a ,uint b) returns (uint){
        return a;
    }


    function caller() public returns (uint) {
      return  setvalues({b:90,a:45});
    }
}

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    Hum.. your input does not seem to be a uint, am I wrong? – Florian Castelain Nov 24 '17 at 8:42
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    Since caller doesn't have view nor pure modifiers remix assumes they are part of a transaction. You should add one of those modifiers. – Ismael Nov 25 '17 at 4:38
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I gave a try executing your code in remix and I am able to get the return value as 45 ,which is the expected output. Make sure you have the contract defined as a separate sol file or inject the dependencies if it's used with other contract.

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