# What are infix and postfix expressions?

**Infix expression**:The

**expression**of the form a op b. When an operator is in-between every pair of operands.

**Postfix expression**:The

**expression**of the form a b op. When an operator is followed for every pair of operands.

In this regard, what is the use of infix to postfix?

**Infix** expressions are readable and solvable by humans. We can easily distinguish the order of operators, and also can **use** the parenthesis to solve that part first during solving mathematical expressions. The computer cannot differentiate the operators and parenthesis easily, that's why **postfix conversion** is needed.

Secondly, how can we convert postfix expression into infix expression? **Steps to Convert Postfix to Infix :**

- Read the symbol from the input .
- If symbol is operand then push it into stack.
- If symbol is operator then pop top 2 values from the stack.
- this 2 popped value is our operand .
- create a new string and put the operator between this operand in string.
- push this string into stack.

Beside above, what are infix prefix postfix notations?

**Prefix** and **Postfix** expressions are easier for a computer to understand and evaluate. Given two operands and and an operator , the **infix notation** implies that O will be placed in between a and b i.e . When the operator is placed after both operands i.e , it is called **postfix notation**.

What are postfix expressions?

**Postfix** notation is a notation for writing arithmetic **expressions** in which the operands appear before their operators. Using Stacks. Homework #5. **Postfix** notation is a notation for writing arithmetic **expressions** in which the operands appear before their operators.