In this prelab, you will implement a lex and yacc code that will read a C code snippet that contains

declarations and comparisons. In the input code, there can be any number of if statements and

declarations. Your program should cover all the valid inputs, and reject the invalids.

ATTENTION: Zip your lex, yacc and submit to Yulearn. Your code can be compiled with the

Makefile provided to you. Be sure that Makefile works properly.

$1)$ If statement

$$ Contains a comparison part and body part

$$ The comparison part can contain $1$ comparison.

o There will be no $$&&$$ and $||$ operation like we did in prelab$2.$

$$ Comparison will be only $==$

$.$

$$ If the body can contain other $$if$$ statements or can contain declarations.

$$ Note: There will be no $$else if$$ or $$else$$ In the input file

$2)$ Declaration statement

$$ There can be $2$ types of declarations: $$int$$ and $$string$$

$.$

o You can assume that there will be only $1$ declaration per line.

$$ int a;

$$ string b;

o In other words, the input file will not contain declarations like:

$$ int a$,$b$,$c;

$$ string a$,$b;

$3)$ Invalid comparison: The input file can contain invalid comparisons. You should detect

and print an error message for that.

$$ The comparisons should be between the same types. If it is not print an error

message: $$Type mismatch in line x$$