Answered: float postfixEval(string postfix)

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Question

Data Structure Using C++

I need a function like this :::

float postfixEval(string postfix) {
int a, b;
stack<float> stk;
string::iterator it;
for(it=postfix.begin(); it!=postfix.end(); it++) {
//read elements and perform postfix evaluation
if(isOperator(*it) != -1) {
a = stk.top();
stk.pop();
b = stk.top();
stk.pop();
stk.push(operation(a, b, *it));
}else if(isOperand(*it) > 0) {
stk.push(checkNumber(*it));
}
}
return stk.top();
}

to evaluate postfix with more one digit in expression (multi digits) please just this function simple like the above

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