1. ## calculating cos

ok to really surprise my mom im doing all the basic windows
ok now im having a problem with the calculator
Code:
```#include<iostream>
using namespace std;
int main()
{
int x;
int y;
int input;
do{
cout<<"1. multiply\n";
cout<<"2. devide\n";
cout<<"4. subtraction\n";
cout<<"5. percentage\n";
cout<<"6. cos&sin\n";
cin>> input;
switch ( input )
{
case 1:
cout<<"please provide 2 numbers to be multiplied\n";
cin>> x >> y ;
cin.ignore();
cout<<( x*y );
cin.get();
break;
case 2:
cout<<"please provide 2 numbers to be devided\n";
cin>> x >> y ;
cin.ignore();
cout<<( x/y );
cin.get();
break;
case 3:
cout<<"pls provide 2 numbers to be added\n";
cin>> x >> y ;
cin.ignore();
cout<<( x+y );
cin.get();
break;
case 4:
cout<<"pls provide 2 numbers to be subtracted\n";
cin>> x >> y ;
cin.ignore();
cout<<( x-y );
cin.get();
break;
case 5:
cout<<"pls provide 2 numbers to percented\n";
cin>> x >> y ;
cin.ignore();
cout<<( x%y );
cin.get();
break;
case 6:
cout<<"pls provide 2 numbers to be cos\n";
cin>> x >> y ;
cin.ignore();
cout<<( cos(x, y );
cin.get();
break;
}
}while(input!=4);
}```

but how do i do cos i dont get it

2. Try using indentation.

For cos you need to include <cmath>.

3. Code:
`}while(input!=4);`
Maybe you want to make that whatever number you want to use for "quit"? Right now 4 invokes Subtraction.

4. sine, cosine, and tangent (sin(), cos(), and tan()) require one argument - an angle. The angle is measured in radians. That argument should be a double (since you will be using pi in any sensible angle), and the return value of sin(), cos() and tan() is a double.

A rewiew of one's trigonometric ratios might help.

And the little 'percentage' operator (modulus) returns the remainer of a division. ie, 5 % 3 = 2 (Since 5 / 3 = 1r2)

Also keep in mine you're using integers the whole way through. The user will not be able to enter a rational number, such as 1.526. I suggest looking into floating point numbers. Operations such as 20/9 will equal 2.

5. ok im thirteen anyone want to dumb it down

6. Ok in your case, you probably want to find the sin and cosin of (x)

Therefore in order to use this in your calculator all you have to do is something like the following.

Code:
```#include<iostream>
#include<math.h>
using namespace std;
{
double x;
cin>>x;

x=x/57.3;

cout<<sin(x);
cout<<cos(x);

.....
}```
sin (x) is also defined as the infinite sum of:

Code:
```
x  -    x^3    +  x^5   -  x^7 +
-----     -----   -----    ....
3!      5!         7!```