Keywords: lpg

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## 8.1.2 Formatted Input

Just as printf(...) is used for formatted output you can use scanf(...) for formatted input.

- `int fscanf(FILE *stream, const char *format, ...)`
  fscanf(...) reads from `stream` and will transform the input with the rules defined in `format`. The results will be placed in the arguments given by `...`(Note: the arguments must be pointer.). The read ends, when no more transformation rules are in `format`. fscanf(...) will return EOF when the first transformation reached the file end or some error occured. Otherwise it will return the number of transformed arguments.

  `format` can include rules on how to format the input arguments (see table 8.2 on page ). It can also include:

  - Spaces or tabs, which are ignored.
  - any normal character (except %). The characters must be in the input on the corresponding position.
  - transformation rules, which assembled with a %, the optional character * (this will permit fscanf(...) to assign to an argument), an optional number, an optional character h, l or L (this is for the length of the target) and the transformation character.
- `int scanf(const char *format, ...)`
  The same as fscanf(stdin,...).
- `int sscanf(char *str, const char *format, ...)`
  As scanf(...), but the input comes from `str`.

Table 8.2: Libc - scanf transformations