An infix expression is expression which is used by us in day
today life
An infix expression is a single letter, or an operator, proceeded by one infix string and followed by another
infix string.
e.g. **A,A + B,(A + B) + (C – D)**.So,in which we have operators between operands.And postfix expression
(also called Reverse Polish Notation)
is a single letter or an operator, preceded by two postfix strings. Every postfix string longer than a single
variable contains first and
second operands followed by an operator.e.g. **A,A B +,A B + C D –**

To convert infix expression to postfix expression, computers usually use the stack data structure. By scanning the infix expression from left to right, when we will get any operand, simply add them to the postfix form, and for the operator and parenthesis, add them in the stack maintaining the precedence of them.So, here you can convert infix expression to postfix by just entering infix expression.Checkout examples that are mention below in table.And you can also check Postfix to infix Converter and Postfix Calculator

1) Infix Expression: (a+b)

Prefix Expression: ab+

2) Infix Expression: (A+B)*(C+D)

Prefix Expression: AB+CD+

3) Infix Expression: x^y/(5*z)+2

Prefix Expression: xy^5z*/2+

Prefix Expression: ab+

2) Infix Expression: (A+B)*(C+D)

Prefix Expression: AB+CD+

3) Infix Expression: x^y/(5*z)+2

Prefix Expression: xy^5z*/2+

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.Compilers or command editor in computer and some calculators also convert expression to postfix first and then solve those expression to evaluate answer for the same.