## Infix to Postfix Conversion: (a+b)*(c+d)/f

Infix notation is the standard mathematical notation where operators are placed **between** their operands. For example, "(a+b)*(c+d)/f". Postfix notation, also known as Reverse Polish Notation (RPN), places operators **after** their operands.

This article will guide you through converting the infix expression **(a+b)*(c+d)/f** to its postfix equivalent.

### Understanding the Conversion Process

The conversion from infix to postfix relies on a stack data structure. Here's a breakdown of the steps:

**Initialize an empty stack.****Scan the infix expression from left to right.****For each token (operand or operator):****Operand:**Add it directly to the postfix expression.**Operator:****If the stack is empty or the top of the stack is a '(':**Push the operator onto the stack.**If the operator has higher precedence than the top of the stack:**Push the operator onto the stack.**If the operator has lower or equal precedence to the top of the stack:**Pop operators from the stack and append them to the postfix expression until you encounter an operator with lower precedence or a '(' . Then, push the current operator onto the stack.

**When you reach the end of the expression:**Pop all remaining operators from the stack and append them to the postfix expression.

### Conversion Example: (a+b)*(c+d)/f

Let's apply this process to our example:

Token | Stack | Postfix |
---|---|---|

( | ( | |

a | ( | a |

+ | ( + | a |

b | ( + | a b |

) | a b + | |

* | * | a b + |

( | * ( | a b + |

c | * ( | a b + c |

+ | * ( + | a b + c |

d | * ( + | a b + c d |

) | * | a b + c d + |

/ | / | a b + c d + * |

f | / | a b + c d + * f |

**Final postfix expression:** **a b + c d + * f /**

### Evaluation of Postfix Expression

Postfix expressions are evaluated using a stack:

**Scan the postfix expression from left to right.****Operand:**Push it onto the stack.**Operator:**Pop the top two operands from the stack, apply the operator, and push the result back onto the stack.

The final value remaining on the stack after processing the entire expression is the result.

### Benefits of Postfix Notation

**Simpler Parsing:**Postfix expressions require simpler parsing algorithms compared to infix.**No need for parentheses:**The order of operations is explicitly defined by the position of the operators.**Suitable for Stack-Based Machines:**Postfix notation is ideal for programming languages that use stack-based architectures.

By understanding infix to postfix conversion, you can better grasp the fundamentals of compiler design and expression evaluation. This conversion is a crucial step in processing mathematical expressions efficiently and accurately.