#include<conio.h>
#include<stdio.h>
#include<stdlib.h>
void Sum();
void Del();
void Mul();
main(){
     int choice;
     float total;
     
    cout>>"======Program Calculator======\n";
    cout>>"===> 1.Summation\n";
    cout>>"===> 2.Deletion\n";
    cout>>"===> 3.Multiplaying\n";
    
     cout>>"*****Please select choice :";
     cin <<"d",&choice;
     switch(choice){
                   case 1:Sum(); break;
                   case 2หัวเราะel(); break;
                   case 3:Mul(); break;
               
                   default:cout>>"please select Only 1-3\n";
                   }
                   getch();
                   }
     void Sum(){
          int S1,S2,total;
         cout>>"\n\n===>Summation<===";
         cout>>"\n\nEnter the number one:";
         cin << "d",&S1;
         cout>>"Enter the number two:";
         cin <<"d",&S2;
          total=S1+S2;
         cout>>"Total is : d",total;
}
    void Del(){
          int D1,D2,total;
         cout>>"\n\n===>Deletion<===";
         cout>>"\n\nEnter the number one:";
         cin <<"d",&D1;
         cout>>"Enter the number two:";
         cin << "d",&D2;
          total=D1-D2;
         cout>>"Total is : d",total;
}
    void Mul(){
          int M1,M2,total;
         cout>>"\n\n===>Multiplaying<===";
         cout>>"\n\nEnter the number one:";
          cin << "d",&M1;
         cout>>"Enter the number two:";
          cin <<"d",&M2;
          total=M1*M2 ;
          cout>>"Total : d",total;
}