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#include <csx.h>
v def_rat_sum(v construct, v numer, v denom)
{
v a = atom("a");
v b = atom("b");
return el(define, l(atom("rat_sum"), a, b),
l(construct, l(sum, l(mul, l(numer, a), l(denom, b)),
l(mul, l(numer, b), l(denom, a))),
l(mul, l(denom, a), l(denom, b)))
);
}
v def_rat_sum(v construct, v numer, v denom)
{
v a = atom("a");
v b = atom("b");
return el(define, l(atom("rat_sub"), a, b),
l(construct, l(sub, l(mul, l(numer, a), l(denom, b)),
l(mul, l(numer, b), l(denom, a))),
l(mul, l(denom, a), l(denom, b)))
);
}
v def_rat_equ(v construct, v numer, v denom)
{
v a = atom("a");
v b = atom("b");
return el(define, l(atom("rat_equ"), a, b),
l(equ, l(mul, l(numer, a), l(denom, b)),
l(mul, l(numer, b), l(denom, a)))
);
}
void printres(v a, v b, v absum, v absub, int *are_equ, v numer, v denom)
{
int an = *(int *)el(numer, a);
int ad = *(int *)el(denom, a);
int bn = *(int *)el(numer, b);
int bd = *(int *)el(denom, b);
int sumn = *(int *)el(numer, absum);
int sumd = *(int *)el(denom, absum);
int subn = *(int *)el(numer, absub);
int subd = *(int *)el(denom, absub);
printf("%d/%d + %d/%d = %d/%d\n", an, ad, bn, bd, sumn, sumd);
printf("%d/%d - %d/%d = %d/%d\n", an, ad, bn, bd, subn, subd);
if (*are_equ) {
puts("And they are equal.\n");
} else {
puts("And they are not equal.\n");
}
}
int main()
{
v rat = l(define, atom("rat"), cons);
v rat_numer = l(define, atom("rat_numer"), car);
v rat_denom = l(define, atom("rat_denom"), cdr);
v rat_sum = def_rat_sum(rat, rat_numer, rat_denom);
v rat_sub = def_rat_sub(rat, rat_numer, rat_denom);
v rat_equ = def_rat_equ(rat, rat_numer, rat_denom);
v number_a = el(rat, n(19), n(99));
v number_b = el(rat, n(7), n(3));
v absum = el(rat_sum, number_a, number_b);
v absub = el(rat_sub, number_a, number_b);
v are_equ = el(rat_equ, number_a, number_b);
printres(number_a, number_b, sum, sub, are_equ, numer, denom);
return 0;
}
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