Truffle Console: How to print the value of a variable using get function

Question

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.

Answer 1

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;

2. 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;
}