Update README.md

csehammad · web-flow · commit aaac99406a6f · 2021-11-25T01:30:10.000+05:00
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-# CodingProblems
+# Coding Challenges 
+### This repository contains various coding challenges taken on Sites like HackerRank, LeetCode etc. 
+
+##Challenge#1- Perfix Notation 
+#### Write a function that evaluates an expression written in Prefix Notiation and returrns a value 
+* Problem Statement: 
+Prefix notation (also known as polish notation) is an alternative to the more familier infix notation. 
+
+In infix notation, operators(add,multiply,etc) are written between their operands(number, variables, or sub-expression). 
+* In prefix notation, operators are written before their operands
+Some examples follow of expression in infix notation and their equivalents in prefix notation. 
+In this example the operator is + and its operands are 1 and 2:
+
+```
+Infix expression: 1 + 2 
+Prefix expression: + 1 2 
+Value: 3
+```
+
+In this example, the sub-expression + 1 2 is the first operand of the + operator 
+
+```
+Infix expression: (1+2) * 3
+Prefix expression: * + 1 2 3 
+Value: 9 
+```
