postfix form

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C++ program to evaluate an expression entered in postfix form

#include <iostream.h> #include <stdlib.h> #include <math.h> #include <ctype.h> const int MAX = 50 ; class postfix { private :   int stack[MAX] ; int top, nn ; char *s ; public : postfix( ) ; void setexpr ( char *str ) ; void push ( int item ) ; int pop( ) ; void calculate( […]