[элементарно][scanf][c]переполнение буфера

Format specifiers: A sequence formed by an initial percentage sign (%) indicates a format specifier, which is used to specify the type and format of the data to be retrieved from stdin and stored in the locations pointed by the additional arguments. A format specifier follows this prototype:

%[*][width][modifiers]type

width Specifies the maximum number of characters to be read in the current reading operation

а вообще лучше fgets

видимо не внимательно маны читал. не нашёл этого

96ая строка мана про scanf