Enter infix: c - d * (e + f)
pushing: (
*infix: c
*infix:
*infix: -
popping: (
pushing: (
pushing: -
*infix:
*infix: d
*infix:
*infix: *
popping: -
pushing: -
pushing: *
*infix:
*infix: (
pushing: (
*infix: e
*infix:
*infix: +
popping: (
pushing: (
pushing: +
*infix:
*infix: f
*infix: )
popping: +
popping: (
popping: *
popping: -
popping: (
postfix: cdef+*-