# Write a Program to Convert Expression from Postfix to Infix using JavaScript in Compiler Design

### Infix & Postfix Notation:

Postfix notation, also known as Reverse Polish Notation (RPN), is an expression format where operators follow their respective operands. For example, the postfix expression "2 3 +" represents the addition of 2 and 3.

In contrast, infix notation is the traditional way of representing expressions, with operators placed between operands. The equivalent infix expression for "2 3 +" is "2 + 3".

Converting a postfix expression to infix notation involves rearranging the operators and operands based on their positions. This process often requires using a stack to hold intermediate results.

## Convert Expression from Postfix to Infix in JavaScript:

Let's explore the JavaScript code that converts postfix expressions to infix notation:

```
function detectOperand(ch) {
return (ch >= 'a' && ch <= 'z') || (ch >= 'A' && ch <= 'Z');
}
function getInfix(postfix) {
let stack = [];
for (let value of postfix) {
if (detectOperand(value)) {
stack.push(value);
} else {
let firstOperand = stack.pop();
let secondOperand = stack.pop();
stack.push("(" + secondOperand + value + firstOperand + ")");
}
}
return stack[stack.length - 1];
}
let postfix = "abc*+d+";
console.log(`The given postfix expression is: ${postfix}`);
console.log(`The corresponding infix expression is: ${getInfix(postfix)}`);
```

## 0 Response to Write a Program to Convert Expression from Postfix to Infix using JavaScript in Compiler Design

## Post a Comment