InfixCalculator

This is the final project for the 'Compilatori' course at the University of Verona, during the last year of bachelor's degree in Computer Science.

It is an infix calculator with +, - ,*, /, % operations and if-then-else statement. There are comparisons between operands <, >, <=, >=, ==, !=. They return True or False to the terminal. Variables are the characters of the alphabet and they can only store integer values.

The compiler can also accept as input a file containing code written with the syntax of our infix calculator. The output of our compiler is a translation of the infix calculator notation into 3-address code with C sintax. Output file written in C can be compiled with gcc if there are no errors in the input file.

How to compile

yacc -d -v infixCalc.y
lex infixCalc.l
gcc y.tab.c lex.yy.c -lfl

From Linux shell:

./a.out [inputFile]

From Windows prompt:

./a.exe [inputFile]

If you want to run only the calculator, you can run it directly from the base folder, otherwise you have to compile the files in 3AC.

Example

Command line

a = 2
b = 3
a <= b
True
a > (b - 1)
False
a == b
False

a = 2
b = 4
if (b < a) then a - b else b - a
= 2

File

The output file will be saved correctly only if at the end the keyword exit is typed.

a=0
b=9
c=13-a*b
if True then c else 79
c==1
d = 23
if d <c then (a-b) else a+c*8/b
exit

#include <stdio.h>
#include <stdlib.h>

void main(){
int t1, t2, t3, t4, t5, t6, t7, t8, a, b, c, d, t9;

 a = 0;
b = 9;
t1 = a * b;
t2 = 13 - t1;
c = t2;
t3 = 1;

if ( t3 )
	goto par0;
else
	goto par1;

par0:
printf("%d\n",c);
goto end1;

par1:
printf("%d\n", 79);

end1: ;
t4 = c == 1;
printf("%d\n",t4);
d = 23;
t5 = d <  c;

if ( t5 )
	goto par2;
else
	goto par3;

par2:
t6 = a - b;
printf("%d\n",t6);
goto end2;

par3:
t7 = c * 8;
t8 = t7 / b;
t9 = a + t8;
printf("%d\n",t9);

end2: ;

}