types in C are pretty weird

int *a can be read as

1. *a is a int
2. since dereferencing is a operator on pointers, a is a pointer to int

int *a, b is read as

1. *a and b are int
2. so a is a pointer to int and b is a int

bool getofmylawn(Lawn lawn)

1. getoffmylawn(Lawn lawn) is a bool
2. since calling is done on functions, getoffmylawn is a function that takes a Lawn and returns a bool

And then you have function pointers

bool (*foo(int a))(float b)

1. (*foo(int a))(float b) is a bool
2. *foo(int a) is a function from float to bool
3. foo(int a) is a function pointer from float to bool
4. foo is a function that takes a int and returns a function pointer from float to bool

really weird in my opinion.

The approximation is only around 4.28*10^-101 off from pi.
https://www.wolframalpha.com/input?i=integral+from+-a+to+a+of+(integral+from+-a+to+a+of+e^-(x^2%2By^2)dy)dx
https://www.wolframalpha.com/input?i=(1-erf(e^e)^2)*pi