Can I declare a variable by 2 data type?

Question

When we have a calculation like "a/b", we have not known the value of a or/and b. So we have not known exactly the value of "a/b" is an integer or a float. I want to know exactly the value of "a/b". If a=7, b=2
=> a/b = 3.5
For instance:
{
int a,b;
int i;
double i;
i = a/b ;
}
Can I ?

Answer 1

try 'union'
...
...
union X {
int a;
float b;
}x;
...
...
{
double i;
int p,q;
....//input p and q
i = p/q;
if (p%q==0)
x=(int)i;//x will behave like a int
else
x=(float)i;//x will behave like a float
...
...
}
try googling it for better understanding

Answer 2

Just (double)a/b or a/(double)b.

Answer 3

Sorry, I had not presented clearly

Answer 4

Thanks. I think I have to learn more

Answer 5

It will give you an error.

Answer 6

you should cast a or b to be a double, because if not, a/b -> int/int -> int.

Answer 7

you can use type casting

Answer 8

no dear, it is wrong

Answer 9

{
int a=7, b=2;
float i;
i=a/b;
cout<<"i= "<<i<<endl;
return 0;
}