IITKESO207A_2P  Calculator
The input is an arithmetic expression in infix notation, for example, 24 ∗ (3 + 5)/7%3. The problem is to write a program that reads the expression given over multiple lines, parses it, evaluates it and gives the output value as a floating point integer or prints the string “Malformed expression” if the input is malformed. The numbers in the expression are integers but the ouput can be floating point. The operators come from the set {+, −, ∗, /, %,(,)}. The operators act as per their usual definitions. We assume the usual precedence among operators, that is, from lowest to highest, {+, −}, then, *, followed by {/, %} and parenthesis, where, + and binary − are at the same level of precedence and have left to right associativity, so do {/, %}.
Note
The three problems given in the assignment have been merged. 75% of the test cases will check if your code works for problem 1 and 2 and 25% of the test cases will check for problem 3. The result that you will get will be between 0 and 100 , denoting the number of testcases that your code passed. We will consider your maximum score while grading.
Update 1: (7 Sep, 2017)
For negative numbers, the '' and the number will be in separate lines. It is your job to figure out whether it is a unary minus or binary.
Update 2: (13 Sep, 2017 3:15PM)
Earlier you were supposed to print string "Malformed expression" without new line at the end. Sorry, for not being explicit about this fact. But from now onwards, new line at the end of "Malformed expression" won't matter.
Input
The first line contains 'n' , the number of tokens in the expression. 'n' lines follow each containing a either a number or an operator .
Output
This should be a single real number. Errors less than 10^2 will be ignored.
Constraints
1<= n <= 20
Inputs will be between 1000 to 1000
Example
INPUT 1:
4
4


3
OUTPUT 1:
7
INPUT 2:
7
3
/
(
2
+
1
)
OUTPUT 2:
1
INPUT 3:
3
1
+
(
OUTPUT 3:
Malformed expression
hide comments
ashutoshs25:
20170910 18:45:58
If the output is 7, should it be printed as 7 or 7.000000 Last edit: 20170910 18:46:15 

amanyu:
20170910 16:11:46
what should be the value of 4%5.


harshith_reddy:
20170910 13:26:37
@ubarsaiyan:A very big thank you for mentioning about removing the new line at the end of 'Malformed expression'. 

shshnk:
20170910 13:04:02
How would 6/7%4 be interpreted? Last edit: 20170910 13:05:14 

ubarsaiyan:
20170910 12:00:41
@makkarr 25 

makkarr:
20170910 01:15:20
how many points are for correctly identifying malformed expression? 

bhavy:
20170910 00:04:44
Q1 Is + unary also considered e.g. 2  + 2 will it be 0 or Malformed expression?


ubarsaiyan:
20170909 20:19:19
Please mention that "Malformed expression" has to be printed without a newline character at the end.


suds13:
20170909 18:06:43
@pclubiitk You said "@jyotshak: There will be no unnecessary operators or brackets in the testcases.". Then how is 12 even acceptable ? 

Programming Club, IITK:
20170909 15:12:07
@nikhilbl: 1

Added by:  Programming Club, IITK 
Date:  20170907 
Time limit:  1s 
Source limit:  50000B 
Memory limit:  1536MB 
Cluster:  Cube (Intel G860) 
Languages:  All 