sys_pro_4

#include "pch.h"
#include <iostream>

using namespace std;
//вариант 20: (b/2 - 53/c)/(b - a*c + 1)


void cppcalc(double a, double b, double c) {
    cout << endl << "System computing: ";
    int zero_flag = 0;
    int of_flag = 0;
    if (c == 0 || (b - a * c + 1) == 0) {
        cout << "Division by zero" << endl;
        return;
    }

    cout << (b / 2 - 53 / c) / (b - a * c + 1) << endl;
    return;
}
void calc(double a, double b, double c) {
    cout << "Asm computing: ";
    int zero_flag = 0;
    int of_flag = 0;
    double result = 0.0;
    double t2 = 2;
    double t1 = 1;
    double t53 = 53;
    _asm {
        finit
        fld b // b (0)
        fld t2 // t2(0), b(1)

        fdiv // b/2 (0)

        fld t53 // t53 (0), b/2 (1)
        fld c // c (0), t53 (1), b/2 (2)

        ftst
        fstsw ax
        sahf
        je zero_f
        fdiv  // 53/c(0), b/2 (1)
        fsub  //  b/2 - 53/c (0)

        fld b // b (0), b/2 - 53/c (1)
        fld a
        fmul c // a*c (0), b (1), b/2 - 53/c (2)
        fsub // b - a*c (0),  b/2 - 53/c (1)
        fadd t1 //  b - a*c + 1 (0), b/2 - 53/c (1)

        ftst
        fstsw ax
        sahf
        je zero_f
        fdiv // (b/2 - 53/c)/(b - a*c + 1) (0)

        fstp result // result = (b/2 - 53/c)/(b - a*c + 1)
        fxam //&&&
        jmp end_of_code

        zero_f : ; флаг ошибки деления на ноль
        mov eax, zero_flag
        inc eax
        mov zero_flag, eax
        jmp end_of_code

        end_of_code : ;
    }

    if (zero_flag == 1) {
        cout << "Division by zero" << endl;
        return;
    }

    if (zero_flag == 0)
        cout << "(b/2 - 53/c)/(b - a*c + 1) = " << result << endl;
}

int main() {
    cout << "a:";
    double a;
    cin >> a;
    cout << endl << "b:";
    double b;
    cin >> b;
    cout << endl << "c:";
    double c;
    cin >> c;
    cout << endl;

    calc(a, b, c);
    cppcalc(a, b, c);

    return 0;
}