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Added stack representation in Infix Prefix Postfix Calculator #1922

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merged 2 commits into from
Dec 17, 2024
+154 −13
Merged

Added stack representation in Infix Prefix Postfix Calculator #1922

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f66fe20
added prefix-infix-postfix table
Nishakulkarni06 Dec 17, 2024
ab8c8e3
Few changes
Rakesh9100 Dec 17, 2024
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1 change: 1 addition & 0 deletions Calculators/Infix-Prefix-Postfix-Calculator/index.html
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Original file line number Diff line number Diff line change
Expand Up @@ -39,6 +39,7 @@ <h2>Infix Prefix Postfix Calculator</h2>
<div class="result" id="result">
<!-- Result will be displayed here -->
</div>
<div class="steps" id="steps"></div>

</div>
</div>
Expand Down
163 changes: 151 additions & 12 deletions Calculators/Infix-Prefix-Postfix-Calculator/script.js
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Original file line number Diff line number Diff line change
Expand Up @@ -11,11 +11,12 @@ function getPrecedence(operator) {
return 0;
}

let steps = document.getElementById('steps');

function infixToPostfix(infixExpression) {
let result = '';
let stack = [];

// Define a function to get precedence of operators
function getPrecedence(operator) {
if (operator === '+' || operator === '-') {
return 1;
Expand All @@ -25,6 +26,23 @@ function infixToPostfix(infixExpression) {
return 0;
}

// Table structure
steps.innerHTML = `
<table border="1" style="width: 100%; text-align: center; border-collapse: collapse;">
<thead>
<tr>
<th>Character</th>
<th>Stack</th>
<th>Result</th>
</tr>
</thead>
<tbody id="table-body">
</tbody>
</table>
`;

let tableBody = document.getElementById('table-body');

for (let i = 0; i < infixExpression.length; i++) {
let char = infixExpression[i];

Expand All @@ -35,40 +53,85 @@ function infixToPostfix(infixExpression) {
} else if (char === ')') {
while (stack.length > 0 && stack[stack.length - 1] !== '(') {
result += stack.pop();
appendRow(char, stack, result);
}
stack.pop(); // Pop '('
stack.pop();
} else if (['+', '-', '*', '/'].includes(char)) {
while (
stack.length > 0 &&
getPrecedence(stack[stack.length - 1]) >= getPrecedence(char)
) {
result += stack.pop();
appendRow(char, stack, result);
}
stack.push(char);
}

// Append a row to the table for each step
appendRow(char, stack, result);
}

// Pop remaining operators in the stack and append rows
while (stack.length > 0) {
result += stack.pop();
appendRow('-', stack, result);
}
document.getElementById('result').innerText = `Result: ${result}`;

return result;

// Helper function to append rows
function appendRow(character, stack, result) {
tableBody.innerHTML += `
<tr>
<td>${character}</td>
<td>${stack.join(', ')}</td>
<td>${result}</td>
</tr>
`;
}
}

function postfixToInfix(postfixExpression) {
let stack = [];
let result = '';

steps.innerHTML += `
<table border="1" style="width: 100%; text-align: center; border-collapse: collapse;">
<thead>
<tr>
<th>Character</th>
<th>Stack</th>
<th>Result</th>
</tr>
</thead>
<tbody id="table-body">
</tbody>
</table>
`;
for (let i = 0; i < postfixExpression.length; i++) {
let char = postfixExpression[i];

if (/[a-zA-Z0-9]/.test(char)) {
stack.push(char);
result = char;
} else if (['+', '-', '*', '/'].includes(char)) {
let operand2 = stack.pop();
let operand1 = stack.pop();
stack.push(`(${operand1}${char}${operand2})`);
let expression = (`(${operand1}${char}${operand2})`);
stack.push(expression);
result = expression;
}
let tableBody = document.getElementById('table-body');

tableBody.innerHTML += `
<tr>
<td>${char}</td>
<td>${stack.join(', ')}</td>
<td>${result}</td>
</tr>
`;
}
document.getElementById('result').innerText = `Result: ${result}`;

return stack.pop();
}
Expand All @@ -77,35 +140,88 @@ function prefixToPostfix(prefixExpression) {
let stack = [];
let result = '';

steps.innerHTML += `
<table border="1" style="width: 100%; text-align: center; border-collapse: collapse;">
<thead>
<tr>
<th>Character</th>
<th>Stack</th>
<th>Result</th>
</tr>
</thead>
<tbody id="table-body">
</tbody>
</table>
`;
for (let i = prefixExpression.length - 1; i >= 0; i--) {
let char = prefixExpression[i];

if (/[a-zA-Z0-9]/.test(char)) {
stack.push(char);
result = char;
} else if (['+', '-', '*', '/'].includes(char)) {
let operand1 = stack.pop();
let operand2 = stack.pop();
stack.push(operand1 + operand2 + char);
let exp = (operand1 + operand2 + char);
result = exp;
}
let tableBody = document.getElementById('table-body');

tableBody.innerHTML += `
<tr>
<td>${char}</td>
<td>${stack.join(', ')}</td>
<td>${result}</td>
</tr>
`;
}
document.getElementById('result').innerText = `Result: ${result}`;

return stack.pop();
}


function postfixToPrefix(postfixExpression) {
let stack = [];
let result = '';

steps.innerHTML += `
<table border="1" style="width: 100%; text-align: center; border-collapse: collapse;">
<thead>
<tr>
<th>Character</th>
<th>Stack</th>
<th>Result</th>
</tr>
</thead>
<tbody id="table-body">
</tbody>
</table>
`;

for (let i = 0; i < postfixExpression.length; i++) {
let char = postfixExpression[i];

if (/[a-zA-Z0-9]/.test(char)) {
stack.push(char);
result = char;
} else if (['+', '-', '*', '/'].includes(char)) {
let operand2 = stack.pop();
let operand1 = stack.pop();
stack.push(char + operand1 + operand2);
let exp = (char + operand1 + operand2);
result = exp;
}
let tableBody = document.getElementById('table-body');

tableBody.innerHTML += `
<tr>
<td>${char}</td>
<td>${stack.join(', ')}</td>
<td>${result}</td>
</tr>
`;
}
document.getElementById('result').innerText = `Result: ${result}`;

return stack.pop();
}
Expand All @@ -119,23 +235,48 @@ function infixToPrefix(infixExpression) {

function prefixToInfix(prefixExpression) {
let stack = [];
let result = '';

steps.innerHTML += `
<table border="1" style="width: 100%; text-align: center; border-collapse: collapse;">
<thead>
<tr>
<th>Character</th>
<th>Stack</th>
<th>Result</th>
</tr>
</thead>
<tbody id="table-body">
</tbody>
</table>
`;

for (let i = prefixExpression.length - 1; i >= 0; i--) {
let char = prefixExpression[i];

if (/[a-zA-Z0-9]/.test(char)) {
stack.push(char);
result = char;
} else if (['+', '-', '*', '/'].includes(char)) {
let operand1 = stack.pop();
let operand2 = stack.pop();
stack.push(`(${operand1}${char}${operand2})`);
let exp = (`(${operand1}${char}${operand2})`);
result = exp;
}
}
let tableBody = document.getElementById('table-body');

tableBody.innerHTML += `
<tr>
<td>${char}</td>
<td>${stack.join(', ')}</td>
<td>${result}</td>
</tr>
`;
}
document.getElementById('result').innerText = `Result: ${result}`;
return stack.pop();
}


function convertExpression() {
let expression = document.getElementById('expression').value;
let conversionType = document.getElementById('conversionType').value;
Expand Down Expand Up @@ -170,11 +311,9 @@ function convertExpression() {
alert('Invalid conversion type selected.');
return;
}

document.getElementById('result').innerText = `Result: ${result}`;
}

function clearInput() {
document.getElementById('expression').value = '';
document.getElementById('result').innerText = '';
}
}
3 changes: 2 additions & 1 deletion Calculators/Infix-Prefix-Postfix-Calculator/style.css
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Original file line number Diff line number Diff line change
Expand Up @@ -8,7 +8,7 @@ body {
display: flex;
align-items: center;
justify-content: center;
height: 100vh;
min-height: 100vh;
}

.sup {
Expand All @@ -22,6 +22,7 @@ body {
justify-content: space-evenly;
background-color: #fff;
padding: 20px;
margin: 25px 0;
border-radius: 10px;
box-shadow: 0 0 10px rgba(0, 0, 0, 0.2);
}
Expand Down
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