Comments are text inserted into the code that the programmer can read, but the compiler skips. In C, comments are surrounded by a /* */ pair, as in the welcome.c example. In C++, comments can be either C-style or by beginning the line with “//”. Examples:
/* This is a C-style comment */ // This is a C++-style comment
Note: It is extremely important to document your code with appropriate comments, particularly when dealing with complicated scientific code, whose purpose can be difficult to glean by looking at the source.