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# java program that involves writing a program to evaluate postfix expressions containing complex numbers using a stack.

java program that involves writing a program to evaluate postfix expressions containing complex numbers using a stack. The algorithm for evaluating a postfix expression requires a stack of complex numbers. The pseudocode for evaluating postfix expressions is given below: while not end of expressionswitch next tokencase complex number:push the value onto the stackcase operator:pop two operands from the stackevaluate operationpush result onto the stackpop the final result off the stackEach complex number will all be enclosed in a pair of parentheses. The operators permitted include +, - and *. You may assume that all expressions are syntactically correct. The user should be allowed to enter and evaluate any number of expressions.