C Comments
Comments in C
Comments can be used to explain code, and to make it more readable. It can also be used to prevent execution when testing alternative code.
Comments can be singled-lined or multi-lined.
Single-line Comments
Single-line comments start with two forward slashes (//).
Any text between // and the end of the line is ignored by the compiler (will not be executed).
This example uses a single-line comment before a line of code:
This example uses a single-line comment at the end of a line of code:
C Multi-line Comments
Multi-line comments start with /* and ends with */.
Any text between /* and */ will be ignored by the compiler:
Example
/* The code below will print the words Hello World!
to the screen, and it is amazing */
printf("Hello World!");
Try it Yourself »
Single or multi-line comments?
It is up to you that you want to use. Normally, we use // for short comments, and /* */ for longer.
Good to know: Before version C99 (released in 1999), you could only use multi-line comments in C.
