C++ Penghitung Kuadrat

Perhitungan  Persamaan Kuadrat C++ menggunakan 4 header.
#include <stdio.h>
#include <conio.h>
#include <math.h>
#include <iostream.h>

float akar1(int a, int b, int c);
float akar2(int a, int b, int c);

main()
{
    int a,b,c,d;
    int pilih;
    char ulang[2];
    mulai1:
    printf("=====================================================\n");
    printf("Program menghitung akar-akar persamaan kuadrat      \n");
    printf("yang mewakii koefisien persamaan kuadrat : AX^2+BX+C\n");
    printf("=====================================================\n\n");
    printf("Masukkan nilai A : ");
    scanf("%d", &a);
    printf("Masukkan nilai B : ");
    scanf("%d", &b);
    printf("Masukkan nilai C : ");
    scanf("%d", &c);

    d=sqrt(b*b-4*a*c);

    if (d<0)
       printf("\nKarena D<0 maka persamaan kuadrat %dX^2+%dX+%d tidak memiliki akar", a,b,c);
    else
        {
        printf("\nAkar-akar dari persamaan kuadrat %dX^2+%dX+%d yaitu :\n\n", a,b,c);
        printf("X1 = %f\n", akar1(a,b,c));
        printf("X2 = %f", akar2(a,b,c));
         printf(" ____PERHITUNGAN PROGRAM____");
menu(pilih);
printf("Hitung Lagi (y/t)");
scanf("%d", &ulang);
if (strcmp(ulang,"y")==0)
{
clrscr();
goto mulai1;
}/*
else {
clrscr();
goto mulai1;
}
}*/
        }

     


    getch();
}

float akar1(int a, int b, int c)
{
      float d, x1;

      d=sqrt(b*b-4*a*c);
      x1=(-b+d)/(2*a);
      return(x1);

}

float akar2(int a, int b, int c)
{
      float d, x2;

      d=sqrt(b*b-4*a*c);
      x2=(-b-d)/(2*a);
      return(x2);

}