Those are some famous place holder:
| type | description |
|---|---|
%c | Represents a single character. It is used to read or print a character value. |
%s | Represents a string of characters. It is used to read or print a string value. |
%f | Represents a floating-point number. It is used to read or print a float value. |
%lf | Represents a double-precision floating-point number. It is used to read or print a double value. |
%d | integer |