## Sum of Two Numbers

To find the sum of two numbers, read the two numbers from user via standard input, pass the two numbers as operands to Addition Operator, and store the result in a variable.

## Dart Program

In the following program, we read two numbers into `x` and `y`, find their sum, and store the result in `output`.

main.dart

```import 'dart:io';

void main(){
//read number from user
print('Enter x');
var x = int.parse(stdin.readLineSync()!);
print('Enter y');
var y = int.parse(stdin.readLineSync()!);

var output = x + y;

print('x + y = \$output');
}
```

Output

```Enter x
4
Enter y
3
x + y = 7
```

We can also read `double` values into `x` and `y`, and find their sum, as shown in the following program.

main.dart

```import 'dart:io';

void main(){
//read number from user
print('Enter x');
var x = double.parse(stdin.readLineSync()!);
print('Enter y');
var y = double.parse(stdin.readLineSync()!);

var output = x + y;

print('x + y = \$output');
}
```

Output

```Enter x
3.14
Enter y
1.52
x + y = 4.66
```

## Summary

In this Dart Tutorial, we learned how to find the sum of given two numbers.