Main.cc: In function ‘int main()’:
Main.cc:13:16: error: ‘Math’ was not declared in this scope
13 | tmp1 = Math.fabs(a - b) / 2;
| ^~~~
Main.cc:18:13: error: ‘Math’ was not declared in this scope
18 | if (Math.fabs(a - n) < Math.fabs(b - n)) tmp2 = Math.fabs(a - n);
| ^~~~