<21>[random:/home/yoshi/www/mac324/exx/recursion] > prog5.4 "+ 2 3" 5 <22>[random:/home/yoshi/www/mac324/exx/recursion] > prog5.4 "* + 2 3 * 2 4" 40 <23>[random:/home/yoshi/www/mac324/exx/recursion] > prog5.4 "* + 7 * * 4 6 + 8 9 5" 2075 <24>[random:/home/yoshi/www/mac324/exx/recursion] >