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C++ Program to convert prefix to postfix

Green Team answered on November 12, 2022 Popularity 8/10 Helpfulness 2/10

answer C++ Program to convert prefix to postfix

related C++ Program to convert prefix to postfix

C++ Program to convert prefix to postfix

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// CPP Program to convert prefix to postfix
#include <iostream>
#include <stack>
using namespace std;
 
// function to check if character is operator or not
bool isOperator(char x)
{
    switch (x) {
    case '+':
    case '-':
    case '/':
    case '*':
        return true;
    }
    return false;
}
 
// Convert prefix to Postfix expression
string preToPost(string pre_exp)
{
 
    stack<string> s;
    // length of expression
    int length = pre_exp.size();
 
    // reading from right to left
    for (int i = length - 1; i >= 0; i--)
    {
        // check if symbol is operator
        if (isOperator(pre_exp[i]))
        {
            // pop two operands from stack
            string op1 = s.top();
            s.pop();
            string op2 = s.top();
            s.pop();
 
            // concat the operands and operator
            string temp = op1 + op2 + pre_exp[i];
 
            // Push string temp back to stack
            s.push(temp);
        }
 
        // if symbol is an operand
        else {
 
            // push the operand to the stack
            s.push(string(1, pre_exp[i]));
        }
    }
 
    // stack contains only the Postfix expression
    return s.top();
}
 
// Driver Code
int main()
{
    string pre_exp = "*-A/BC-/AKL";
    cout << "Postfix : " << preToPost(pre_exp);
    return 0;
}

Popularity 8/10 Helpfulness 2/10 Language cpp

Source: www.geeksforgeeks.org

Tags: c++ postfix prefix

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Contributed on Nov 12 2022

Green Team

0 Answers Avg Quality 2/10

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C++ Program to convert prefix to postfix

Comment

// CPP Program to convert prefix to postfix
#include <iostream>
#include <stack>
using namespace std;
 
// function to check if character is operator or not
bool isOperator(char x)
{
    switch (x) {
    case '+':
    case '-':
    case '/':
    case '*':
        return true;
    }
    return false;
}
 
// Convert prefix to Postfix expression
string preToPost(string pre_exp)
{
 
    stack<string> s;
    // length of expression
    int length = pre_exp.size();
 
    // reading from right to left
    for (int i = length - 1; i >= 0; i--)
    {
        // check if symbol is operator
        if (isOperator(pre_exp[i]))
        {
            // pop two operands from stack
            string op1 = s.top();
            s.pop();
            string op2 = s.top();
            s.pop();
 
            // concat the operands and operator
            string temp = op1 + op2 + pre_exp[i];
 
            // Push string temp back to stack
            s.push(temp);
        }
 
        // if symbol is an operand
        else {
 
            // push the operand to the stack
            s.push(string(1, pre_exp[i]));
        }
    }
 
    // stack contains only the Postfix expression
    return s.top();
}
 
// Driver Code
int main()
{
    string pre_exp = "*-A/BC-/AKL";
    cout << "Postfix : " << preToPost(pre_exp);
    return 0;
}

Popularity 9/10 Helpfulness 2/10 Language cpp

Source: www.geeksforgeeks.org

Tags: c++ postfix

Link to this answer
Share Copy Link

Contributed on Nov 12 2022

Green Team

0 Answers Avg Quality 2/10

C++ Program to convert prefix to postfix

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