How do I make a structure chart for this C++ code?

#include using namespace std;

int main(){

//How much miles you driven after fueling double milesDriven;

//How much gallons you fueled double gallonsfueled;

//output double mpg;

//take user input of milesDriven cout<<"How much miles you driven after fueling: "; cin>>milesDriven;

//take user input of gallonsfueled cout<<"How much gallons you fueled: "; cin>>gallonsfueled;

//calculate mpg mpg = milesDriven / gallonsfueled;

//prints mpg cout<<"Miles per gallong(MPG) = "<

return 0; }