213ÂÊ: \expandafter
1ºÎÅÍ \n ±îÁöÀÇ ÇÕÀ» ±¸ÇÏ´Â ·çƾÀÔ´Ï´Ù.
\newcount\n
\def\square{\multiply\n\n}
\def\divtwo{\divide\n2}
\def\summation#1{\n=#1 \def\add{\advance\n#1}
\expandafter\expandafter\expandafter\square\expandafter\add\divtwo
The sum from 1 to #1 is \number\n.}
\summation{97}
\summation{98}
\summation{99}
\summation{100}
°á°ú