0

I want to printthe value of iVar:

pragma solidity ^0.5.1;
   contract PRetVal {
      uint8  iVar =0;
      function testFunc() public returns (uint8) {
         iVar = iVar + 10;
         return iVar;
      }
   }

I am trying the following :

truffle(development)> PR = await PRetVal.at(0x596D30c26211B4Dab998F63D6Bf5eba55B0B1d2D) 
undefined
truffle(development)> await PR.getIVar 
undefined truffle(development)>

But I am not getting any value. Somebody please guide me.

Zulfi.

2

You need a couple of changes to see the value of iVar:

  1. Make it public in order to generate a getter function:

    uint8 public iVar = 0;

  1. Call the variable with parenthesis (because it is now public and has a getter):

    truffle(development)> await PR.getIVar()

Alternatively, you could also add a function in the contract to retrieve the value, such as:

function getiVar() external view returns(uint8){
    return iVar;
}
2
  • I am getting > PR.getiVar() <BN: a> what is the meaning of BN? – zak100 Feb 7 at 4:40
  • 1
    This is 'Big Number' type, so you can do a conversion such as : PR.iVar().then(result => console.log(result.toNumber())) – Sergi Juanati Feb 7 at 6:43

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