
### Solution

```
// Use the output builtin.
%builtins output

// Import the serialize_word() function.
from starkware.cairo.common.serialize import serialize_word

func main{output_ptr: felt*}() {
// Output 100 by calling serialize_word.
serialize_word(100);
// Output 200.
serialize_word(200);
// Output 300.
serialize_word(300);
// Output 400.
serialize_word(400);
// Return.
return ();
}
```

You only need to pass the value that you want to output, as an argument to the serialize_word() function. In this case 400:

```
// Output 400.
serialize_word(400);
```

serialize_word()  appends a single word to the output pointer, and returns the pointer to the next output cell.

For more reference: 
[https://github.com/starkware-libs/cairo-lang/blob/master/src/starkware/cairo/common/serialize.cairo]()




Can you help how to change the code so that it outputs 400 as well?

```
// The following code outputs the numbers 100, 200, 300.
// 1. Click on "Run" to see the output.
// 2. Change it to output 400 as well.

// Use the output builtin.
%builtins output

// Import the serialize_word() function.
from starkware.cairo.common.serialize import serialize_word

func main{output_ptr: felt*}() {
// Output 100 by calling serialize_word.
serialize_word(100);
// Output 200.
serialize_word(200);
// Output 300.
serialize_word(300);
// Return.
return ();
}
```

---

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