Unhandled exception: type 'String' is not a subtype of type 'int' of 'times'

Question

import 'dart:io';

void main(List<String> args) {
var w1, item1, w2, item2;
print('Weight-Item1: ');
w1 = stdin.readLineSync();
print('Number of Items: ');
item1 = stdin.readLineSync();
print('Weight-Item2: ');
w2 = stdin.readLineSync();
print('Number of Items: ');
item2 = stdin.readLineSync();
var result = ((w1 * item1) + (w2 * item2)) / (item1 + item2);
print(result);
}

Answer 1

Don't know dart, but as it seems, stdin.readLineAync() returns a String. Looks like you need to convert the string input into number before you can do arithmetic operation on them.