Team Members:

1. Aakarshan Gupta
2. Himanshu Tolani
3. Jatin Garg
4. Saumya Goyal
5. Skand Vishwanath Peri

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Description of Program:

This program takes in basic C text file as an input (input to be given in input.txt) and simulates that C program and results the output.

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Syntax:

Variable assignment:

a = 5;
a[1] = 5l
a = b; [b is previously assigned, else will give an error]

While Loop:

while( Condition )
{
  Statement;
};

Note : There is a ; after the while loop closing curly braces.

Operations :

Operations are similar to that in C language:

Addition:

a = a + 1;
a = b + c;
a = 5 + 3;

Subtraction:

a = a - 1;
a = b - c;
a = 5 - 3;

Multiplication:

a = a * 1;
a = b * c;
a = 5 * 3;

Division:

a = a / 1;
a = b / c;
a = 5 / 3;

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Description of the Grammar: (with print and read commands)

P -> S; | S;P
S -> A | W | R | O
A -> V1 = E
W -> while(E){P}
V1 -> V | Vi
V -> {a-z}+ [except while]
Vi -> V[E]

E -> E < E1 | E == E1 | E1
E1 -> E1 + E2 | E1 - E2 | E2
E2 -> E2 * E3 | E2 / E3 | E3
E3 -> (E) | V1 | C
C -> {0-9}+ . {0-9}k | {0-9}+

R -> read V1
O -> print V1 | print C

Here 0 <= j <= B is the precision limit of the decimal point

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NOTE :

The name of the file is input.txt. The precision of the decimal point is taken (by default) to be 8.

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Instructions to run and compile the code:

Compile: gcc simulator.c

Run ./a.out

The output can be viewed in output.txt file that would be created.