C言語で簡単な計算機コードを実現する

#include 
#include 
#include 
//     
int main(void)
{
        double bNumber, Number, Result;                //          
        int No;                //       
        double a, b, c, x1, x2, Rad;                //            
        int Ary_10;                                        //       
        char string[32];                //       
 
        system ("title       —— By:HaGit");                //        
 
        while(1)
        {
                //  
                printf ("┏ ┅ ┅ ┅ ┅ ┅ ┅ ┅ ┅ ┅ ┅ ┅ ┅ ┅ ┅ ┅ ┓
");
                printf ("┇          :                         ┇
");
                printf ("┣ ┅ ┅ ┅ ┅ ┅ ┅ ┅ ┅ ┅ ┅ ┅ ┅ ┅ ┅ ┅ ┫
");
                printf ("┇      _1        _5                    ┇
");
                printf ("┇      _2           _6              ┇
");
                printf ("┇      _3                                  ┇
");
                printf ("┇      _4                 _0             ┇
");
                printf ("┗ ┅ ┅ ┅ ┅ ┅ ┅ ┅ ┅ ┅ ┅ ┅ ┅ ┅ ┅ ┅ ┛
");
                printf ("Please write down the number:");
                scanf ("%d",&No);
 
                if (No == 1)
                {
                        //          
                        printf ("              :");
                        scanf ("%lf",&bNumber);
                        printf ("             :");
                        scanf ("%lf",&Number);
                        Result = bNumber + Number;
                        printf ("    : %lf

",Result);
                }
                else if (No == 2)
                {
                        //          
                        printf ("              :");
                        scanf ("%lf",&bNumber);
                        printf ("             :");
                        scanf ("%lf",&Number);
                        Result = bNumber - Number;
                        printf ("    : %lf

",Result);
                }
                else if (No == 3)
                {
                        //          
                        printf ("              :");
                        scanf ("%lf",&bNumber);
                        printf ("             :");
                        scanf ("%lf",&Number);
                        Result = bNumber * Number;
                        printf ("    : %lf

",Result);
                }
                else if (No == 4)
                {
                        //          
                        printf ("              :");
                        scanf ("%lf",&bNumber);
                        printf ("             :");
                        scanf ("%lf",&Number);
                        Result = bNumber / Number;
                        printf ("    : %lf

",Result);
                }
                else if (No == 5)
                {
                        //       
                        printf("            :");
                        scanf("%d", &Ary_10);
                        itoa (Ary_10, string ,2);
                        printf("   : %s
", &string);
                        printf("   : %o
", &Ary_10);
                        printf("    : %x
", &Ary_10);
                }
                else if (No == 6)
                {
                        //            
                        printf("          a,b,c   :");
                        scanf("%lf%lf%lf",&a,&b,&c);
                        Rad = b*b - 4*a*c;
                        if (Rad > 0)
                        {
                                x1 = -b + sqrt(Rad) / (2*a);
                                x2 = -b - sqrt(Rad) / (2*a);
                                printf("     x1 = %lf, x2 = %lf
", &x1, &x2);
                        }
                        else if (Rad == 0)
                        {
                                x1 = -b / (2*a);
                                printf("      x1 = %lf
", &x1);
                        }
                        else
                        {
                                printf("  
");
                        }
                }
                else if (No == 0)
                {
                        //            
                        break;
                }
                else
                {
                        //               
                        printf("          。

");
                }
                system ("pause");        //      
                system ("cls");                //  
        }
        return 0;
        getchar();
}