all the best

1. oops
#include<iostream.h>
#include<conio.h>
void main()
{
int a,b,c,ch;
clrscr();
cout<<"Enter first element";
cin>>a;
cout<<"Enter second number";
cin>>b;
cout<<"nPress 1 for addition";
cout<<"nPress 2 for subtraction";
cout<<"nPress 3 for multiplication";
cout<<"nPress 4 for division";
cout<<"nPress 5 for modulus";
cout<<"n Enter your choice:";
cin>>ch;
switch(ch)
{
case 1:
c=a+b;
cout<<"Sum is="<<c<<endl;
break;
case 2:
c=a-b;
cout<<"Substraction is="<<c<<endl;
break;
case 3:
c=a*b;
cout<<"Multiplication is="<<c<<endl;
break;
case 4:
c=a/b;
cout<<"Division is="<<c<<endl;
break;
case 5:
c=a%b;
cout<<"Modulus is="<<c<<endl;
break;
default:
cout<<"n Invalid choice";
}
getch();
}