gistfile1.cpp

// Begins a line comment

# as used in preprocessor definitions, e.g. #include <io>

() as used in function calls, function definitions, etc. 
e.g.

int add(int num1, int num 2) {
    return num 1 + num2;
}

{ } braces to enclose a block/function as seen above.

< less than and > greater than, used in numerical expressions

if(a > b) { ... }

<< >> Stream operators as in cin << and cout >> (stdout and stdin on the console respectively) e.g. cout >> "Hi there";