Main.cc:7:1: error: expected initializer before ‘double’
double approximatePi(int n) {
^~~~~~
Main.cc: In function ‘int main()’:
Main.cc:23:21: error: ‘approximatePi’ was not declared in this scope
double result = approximatePi(n);
^~~~~~~~~~~~~
Main.cc:25:22: error: ‘setprecision’ was not declared in this scope
cout << fixed << setprecision(5) << result << endl;
^~~~~~~~~~~~