Installation

• Run the following commands to install the .exe file 1.

      bison –y project.y -d
  

      flex project.l
  

      gcc y.tab.c lex.yy.c
  

• Run the following command to run the .exe program taking inputs from the command line

      a.exe
  

• Run the following command to run the .exe program taking inputs from file

      a.exe <inputfile.txt> outputfile.txt
  

• Available test case files 1- testcase1.txt: provides operations in integers and floats such as =,+, -,* and / and unary - and in different variations eg x=3+2; x+=2; to run this test case use the following command a.exe <testcase1.txt> output1.txt

  2- testcase2.txt: provides operations in string and characters such as =,+(for string concatnation)and in different variations eg x="emad"; t='c'; to run this test case use the following command a.exe <testcase2.txt> output2.txt

  3- testcase3.txt: provides error "used without type definintion" to run this test case use the following command a.exe <testcase3.txt> output3.txt

  4- testcase4.txt: provides error "used without being initialised" to run this test case use the following command a.exe <testcase4.txt> output4.txt

  5- testcase5.txt: provides error "type mismatch" to run this test case use the following command a.exe <testcase5.txt> output5.txt

  6- testcase6.txt: provides error "variable redeclaration" to run this test case use the following command a.exe <testcase6.txt> output6.txt

  7- testcase7.txt: provides error "This operator cannot be applied to strings" to run this test case use the following command a.exe <testcase7.txt> output7.txt

  NOTE THAT: each error lead to the system to exit, so we have to make a test case for each error sepratly

Usage

1. Vairable declaration I. Declaring an integer 'x' with/without initial value int x; int x = 2;

   II. Declaring a string 'x' with/without initial value string x; string x = "Lex";

   III. Declaring a float 'x' with/without initial value float x; float x = 2.3;

   IV. Declaring a character 'x' with/without initial value char x; char x = 'L';

2. Operations I. Standard operations

   • Add '+' (int, float, string, char)

       x = 3 + 2;
   

   • Subtract '-' (int, float, char)

       x = 3 - 2;
   

   • Multiply '*' (int, float, char) Bonus Addition

       x = 3 * 2;
   

   • Divide '/' (int, float, char) Bonus Addition

       x = 3 / 2;
   

   II. Unary Operations Bonus Addition - Subtraction (int, float) x = -1;

   III. Atomic Operations Bonus Addition

   • To add a certain value to a variable, you can do it like

       x = x + z;
   

   to add z to the current value of x

   • Alternatively, you could also do

       x += z;
   

   which would do the same operation as above

   • Add

       x += 2;
   

   • Subtract

       x -= 2;
   

   • Multiply

       x *= 2;
   

   • Divide

       x /= 2;
   

   IV. Print Bonus addition for debug

   • Applies to all data types

       int x = 2;
       print(x);
       float y = 3.5;
       print(y);
       char c = 's';
       print(c);
       string z = "Lex";
       print(z);
   

3. Errors I. Variable redeclaration Bonus Addition

       int x = 2;
       int x = 4;
   

   II. Use of undeclared variable Bonus Addition

       int x = 4;
       int y = z + x;
   

   (where z is an undeclared variable)

   III. Use of uninitialized variable

       int x;
       int y = x + 2;
   

   IV. Type mismatch

       int x = 3;
       float y = 5.4 + x;
   

   V. Incompatible operations Bonus Addition

       string x = -"Lex";
       string y = "Yacc" - "Lex";
   

4. Comments Bonus Addition

   • Add '//' before any line to be considered a comment

       // This line adds two integers