Evaluate postfix (Reverse Polish notation) is a notation in which every operator follows all of its operands. Program to evaluate postfix notation using stack and print the value.
Infix and postfix are the notations to write the expressions. The infix notation put operators in between the operands. The postfix notation put operators after their operands. Write a program convert from infix notation to postfix notation.
Write a program to read the symbol string from the user. The program should validate the symbols using the stack. Stack uses push and pop operations for validating the symbol.