"//" is the inline comment and "/* .. */" is the block comment.
Sometimes mixing the two type of comments is very useful.
If you use like this, the first line is comment and second line runs.
/*
This is comment.
/*/
This runs.
//*/
When you add "/" in front of the "/*" at the beginning, it changes.
//*
This runs.
/*/
This is comment.
//*/
I used usually it when I need the test account.
