Assume that the following code segment is correct, except for some missing punctuation marks such as parentheses, semicolons, and brackets. Add the necessary punctuation to correct the code in such a way that the indentation does not need to be changed for readability.

```
if a > b
x = x + 10
printf("%lf\n", x)
else
printf("%lf\n", y)
printf("%lf\n", z)
```

```
if (a > b) {
x = x + 10;
printf("%lf\n", x);
} else {
printf("%lf\n", y);
printf("%lf\n", z);
}
```